A roll-on sizing process

Abstract

The present application belongs to the technical field of bamboo processing, and particularly relates to a rolling and gluing process. The process comprises continuously moving the bamboo to be processed along a predetermined track, continuously applying a first-stage rolling stress to the overall surface of the bamboo in an initial pressing area of the moving path, synchronously continuously spraying glue solution to the surface of the bamboo, forcibly pressing the glue solution into the shallow fiber pores of the bamboo, continuously moving the bamboo, applying a second-stage rolling stress to the bamboo with the glue solution attached in a subsequent pressing area, and collecting the finished product. The two-stage rolling and gluing process can guide the glue solution into the pores and shallow cracks of the bamboo, thereby increasing the retention amount and penetration depth of the glue solution in the bamboo.

Description

Technical Field

[0001] This invention belongs to the field of bamboo processing technology, specifically relating to a roller pressing and gluing process. Background Technology

[0002] Bamboo, as an environmentally friendly, renewable, and mechanically superior natural biomass material, has been widely used in engineering construction, furniture manufacturing, and transportation paving. In the processing of bamboo-wood composite materials such as reconstituted bamboo and bamboo plywood, the gluing process is the core step that determines the final product's bonding strength, water resistance, and structural stability.

[0003] Currently, the industry generally uses the traditional immersion-type gluing process when applying glue to bamboo. This process typically involves immersing the entire bamboo unit to be treated into a immersion tank containing glue, relying on the natural gravity and capillary action of the glue to penetrate. After soaking for a certain period of time, the bamboo is removed, allowed to drain naturally or be dried, and then proceeds to the subsequent pressing and molding process.

[0004] However, bamboo has a highly anisotropic physical structure, with an extremely dense siliceous layer and a hard bamboo core layer on its outer surface, and uneven distribution of vascular bundles inside. Traditional soaking processes rely solely on the natural capillary penetration of the adhesive, which has extremely weak penetration power. The adhesive often only adheres to the surface of the bamboo or in the shallow pores, making it difficult to penetrate the dense layer and reach the deep fibers. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a roller pressing application process.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A roller pressing application process is provided, including the following steps: S1. The bamboo to be treated is continuously moved along a predetermined trajectory, and a first-level roller pressure is continuously applied to the entire surface of the bamboo in the initial pressure zone of the moving path; while the bamboo is under pressure deformation, adhesive is continuously sprayed onto its surface at the same time, and the adhesive is forced into the shallow fiber pores of the bamboo. S2. Maintain the continuous movement of the bamboo material and apply a second-level roller pressure stress to the bamboo material with the adhesive in the subsequent pressure zone; use the second-level roller pressure stress to force the surface adhesive to continuously penetrate into the deep layer of the bamboo fiber and to homogenize the thickness of the adhesive layer on the surface of the bamboo material, so as to squeeze out the air bubbles and excess adhesive wrapped inside the adhesive layer. S3. Guide the bamboo material away from the second-stage roller pressure stress zone, so that it continues to be conveyed along the discharge trajectory under normal pressure; control the conveying time of the bamboo material under normal pressure to reach a predetermined threshold, so that the glue that has penetrated into the fiber can be initially cured, and then the finished product is collected.

[0007] Preferably, the stress magnitude of the initial pressure zone and the subsequent pressure zone is set by adjusting the roller gap; The initial thickness of the bamboo material to be processed is set as follows: The roller gap in the initial pressure zone is controlled to be... The roller gap in the subsequent pressure zone is And satisfy: ; In step S1, the first-level rolling stress is applied to the bamboo material by means of dot matrix pressing or mesh engraving.

[0008] Preferably, during the execution of steps S1 and S2, the following steps are performed simultaneously: The initial pressure zone is set to have a constant first conveying linear velocity. And control the second conveyor line speed of the subsequent pressure zone. According to the predetermined cycle Perform alternating fluctuation regulation; In each cycle Inside, regarding the The alternating fluctuation adjustment steps include: Will Increase to greater than The first speed threshold, and maintain it for the first time period. This keeps the bamboo material in a longitudinally stretched tension state between the two pressure zones; Then Reduce to equal to The second speed threshold, and maintained for the second time period. This allows the bamboo material to be in a relaxed state where the longitudinal tension is released.

[0009] Preferably, the first time period The range of values ​​is limited to s; Second time period The range of values ​​is limited to s; Furthermore, the first time period and the second time period are set to satisfy: .

[0010] Preferably, the subsequent pressure zone includes an upper pressure roller and a lower pressure roller arranged opposite to each other; In step S2, the driving linear speed of the upper pressure roller is set to... The driving linear velocity of the lower pressure roller is Real-time control of the With the Forming between The differential ratio.

[0011] Preferably, between step S1 and step S2, the following step is further included: In step S1, the temperature of the adhesive liquid injected into the initial pressure zone is controlled to be... In step S2, the working surface temperature for applying the second-stage rolling stress is at... The cold-pressed state.

[0012] Preferably, in step S1, the adhesive injection step for the initial pressure zone includes: Real-time acquisition of the current travel speed of the bamboo; Control the injection flow rate of the coating adhesive so that the adhesive accumulates at the interlocking front end of the rotating roller surface in the initial pressure zone and the bamboo surface, forming a retained adhesive bag; Adjust the ratio of the travel line speed to the glue injection flow rate so that the peak point of the maximum hydrodynamic pressure generated inside the glue pack is spatially ahead of the physical interlocking line of the initial pressure zone.

[0013] Preferably, step S1 further includes the following step: Real-time monitoring of the operating torque of the drive motor performing the rolling action in the initial pressure zone; When the amplitude of the fluctuation in the operating torque exceeds a preset torque threshold, a local dense region identification signal is generated; Based on the identification signal of the local dense area, after a preset delay time, the current injection flow rate of the coating adhesive is synchronously reduced according to a set attenuation ratio, and then restored to the initial injection flow rate after a set duration.

[0014] Preferably, in step S2, after the step of squeezing out the air bubbles and excess adhesive inside the adhesive layer, the following step is further included: At the discharge end of the subsequent pressure zone, the excess adhesive liquid physically squeezed from the surface of the bamboo is collected by a follow-up scraper; the collected excess adhesive liquid is introduced into a constant temperature filter assembly for impurity removal and purification; the purified adhesive liquid is mixed with newly prepared adhesive liquid in a predetermined ratio and returned to the adhesive supply system of the initial pressure zone for cyclic application.

[0015] Preferably, the step of controlling the injection flow rate of the coating adhesive to accumulate at the interlocking front end of the rotating roller surface in the initial pressure zone and the bamboo surface further includes: Adjust the jet angle of the adhesive injection nozzle so that the center line of the adhesive jet forms an angle of 30° to 45° with the horizontal trajectory of the bamboo material, and control the landing point of the jet center line to be located in an offset area 10mm to 20mm above the center point of the arc surface of the rotating roller.

[0016] This invention provides a roller pressing application process, and the beneficial effects of this invention are as follows: By using two-stage rolling and gluing, the adhesive is introduced into the pores and shallow cracks of the bamboo, increasing the retention and penetration depth of the adhesive inside the bamboo. Attached Figure Description

[0017] Figure 1 This is one of the flowcharts of the roller pressing and gluing process proposed in this invention; Figure 2 This is the second schematic diagram of the roller pressing and gluing process proposed in this invention; Figure 3 This is a schematic diagram of the adhesive application angle in the roller pressing adhesive application process proposed in this invention; Figure 4 This is a schematic diagram of the converging wedge-shaped space in the roller pressing and gluing process proposed in this invention.

[0018] Explanation of reference numerals in the attached figures: 1. Initial pressure zone; 2. Subsequent pressure zone; 3. Converging wedge space; 4. Residual adhesive pack. Detailed Implementation

[0019] 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.

[0020] Please see Figures 1-4 As shown, the specific embodiments provided by the present invention are as follows: like Figure 1 As shown, an embodiment of the present invention proposes a roller pressing application process, which mainly includes the following continuous execution steps: The bamboo to be processed is continuously moved along a predetermined trajectory, and a first-level roller pressure is continuously applied to the entire surface of the bamboo in the initial pressure zone 1 of the moving path. During this process, the bamboo is compressed in a section perpendicular to the conveying direction. Its natural dense surface layer, such as bamboo green or dense silica layer, and internal vascular bundles undergo compressive deformation under the action of the first-level roller pressure, causing the originally closed shallow pores and microcracks to be forced to open.

[0021] During the aforementioned compressive deformation of the bamboo, the system simultaneously and continuously applies adhesive to its surface. Because the adhesive application and rolling actions are synchronized, the adhesive covering the bamboo surface is directly affected by the extrusion force when it comes into contact with the rolling working surface, forcing the adhesive into and injecting it into the shallow fiber pores of the bamboo that have just opened, thus completing the initial forced penetration.

[0022] The bamboo continues to move along the processing line, and after leaving the initial pressure zone 1, a second level of roller pressure is applied to the bamboo, which is coated with the initial adhesive, in the subsequent pressure zone 2. When the bamboo enters the subsequent pressure zone 2, its surface already carries the initially pressed adhesive. At this point, the second level of roller pressure not only continues to push the bamboo body, but more importantly, it generates a secondary propulsive force on the surface adhesive.

[0023] Utilizing the continuous pressure of the second-stage roller, the adhesive, initially confined to shallow pores, penetrates deeper into the bamboo fibers, increasing the wetting depth. Simultaneously, the roller action in subsequent pressure zone 2 flattens the bamboo surface, homogenizing the adhesive layer thickness. During this flattening and thinning process, tiny air bubbles and unevenly distributed excess adhesive that were initially trapped within the adhesive layer or shallow pores are forcibly removed as the roller contact surface advances. This effectively prevents hollow areas or adhesive gaps within the finished product and reduces unnecessary adhesive loss.

[0024] After the two-stage forced compression process described above, the bamboo is guided away from the second-stage roller pressure stress zone, allowing it to continue being conveyed along the discharge trajectory under normal pressure. Once the external stress is completely removed, the highly compressed natural fiber bundles inside the bamboo will experience slight rebound and recovery due to the material's own elasticity. During this process, the volume of the opened pores inside the bamboo increases, thereby inducing a small local pressure difference between the inside and outside of the pores. This pressure difference helps promote the continued migration of the adhesive that has been pressed deep into the pores, effectively inhibiting the overflow and loss of adhesive.

[0025] Based on this, the conveying time of bamboo under normal pressure is controlled to reach a predetermined threshold. This predetermined threshold time window provides reaction time for the initial cross-linking of adhesive molecules and bamboo fibers, allowing the adhesive penetrating into the fibers to complete initial curing and morphological locking. After the adhesive layer stabilizes, the subsequent finished product collection process can be carried out, thereby ensuring the high efficiency of the entire adhesive application process and the excellent mechanical properties of the finished product.

[0026] In a preferred embodiment, the initial thickness of the bamboo material to be treated in its natural state is set as follows: The system controls the roller gap in the initial pressure zone 1 to be... And control the roller gap in the subsequent pressure zone 2 to be And it satisfies the following relation: .

[0027] because and All are smaller than the initial thickness of the bamboo. This ensures that both levels of pressure zones effectively compress the bamboo. More importantly, This means the amount of pressure applied to the bamboo by the initial pressure zone 1. Significantly greater than the reduction in subsequent pressure zone 2 Thus, the bamboo undergoes two stages in continuous movement: heavy pressure breaking down the cell walls and light pressure deep penetration. In step S1, the large amount of pressure generates extremely high destructive stress, breaking down the extremely dense siliceous layer on the surface of the bamboo and squeezing out a large number of cracks in its shallow vascular bundles, opening channels for the entry of the adhesive; while in step S2, the relatively large gaps... This transforms into a pressure-holding and pushing state, which maintains the driving pressure required for the adhesive to penetrate deeper, and effectively prevents the deep fibers from breaking or the entire board from splitting due to prolonged exposure to extreme overload.

[0028] Furthermore, in step S1 of the above embodiment, in order to maximize the wetting efficiency of the initial pressure zone 1, the roller surface applies a first-level roller pressure stress to the bamboo material by means of dot matrix pressing or mesh engraving.

[0029] On the one hand, the raised dots or mesh patterns create dense stress concentration points on the bamboo surface. This contributes to the total reduction. Under the premise of no change, these protrusions can pierce the dense layer of bamboo green / bamboo yellow with local pressure; On the other hand, the grooved areas between the weave or dot matrix form a glue reservoir during high-speed rolling. When the synchronously coated glue enters the rolling engagement zone, a large amount of glue is temporarily stored in the glue reservoir, avoiding the drawback of being completely squeezed to both sides by the smooth roller surface.

[0030] In a preferred embodiment, the system sets the initial pressure zone 1 to have a constant first conveyor linear velocity. This serves as the baseline conveying power for the bamboo material; simultaneously, the second conveying linear speed of the subsequent pressure zone 2 is controlled via a servo drive or frequency conversion control system. The system adjusts by alternating fluctuations according to a predetermined cycle.

[0031] Specifically, in the first stage, the system will increase the second conveyor line speed. Increase to greater than The first speed threshold, and strictly maintained for the first time period. Because the rear traction speed is greater than the front feeding speed, the bamboo material between the two pressure zones is under tension and stretched longitudinally.

[0032] Under longitudinal tensile stress, the fiber pores and vessels inside the bamboo along the grain direction are forced to elastically elongate, resulting in an increase in the cross-sectional area and internal volume of its micropores. At this time, the low-viscosity adhesive that has just been pressed into the shallow layer of the bamboo by the initial pressure zone 1 will further migrate into the core fiber network under the local pressure difference generated by the expansion of the pore volume, thereby increasing the wetting depth of the adhesive.

[0033] In the first time period After it ends, the system will Reduce to equal to The second speed threshold, and maintained for the second time period. At this point, the longitudinal tensile stress applied to the bamboo is relieved, and the bamboo returns to a relaxed state.

[0034] As the tensile stress disappears, the longitudinal fiber bundles of bamboo, under high tension, will elastically retract. This causes the previously expanded fiber pores to close and shrink, reducing the pore volume. The outward pressure generated by this pore shrinkage not only pushes out excess free adhesive that has just been drawn into the deeper layers, making it more evenly and densely distributed within the fiber network, but more importantly, it efficiently expels tiny air bubbles that were originally trapped inside the adhesive layer and in the dead corners of the pores to the bamboo surface. These bubbles are then crushed and physically peeled off by the rolling action of the subsequent pressure zone 2.

[0035] Through the aforementioned first time period With the second time period The bamboo undergoes dynamic circulation between two pairs of rollers through periodic alternation and overlap. Compared to the stable and constant-speed conveying method in existing technologies, this reduces the defects of hollow areas and shrinkage cavities inside the finished boards.

[0036] In a preferred embodiment, a first time period is set. The value range is limited to 0.8s to 2.5s; simultaneously, a second time period is set. The value range is limited to 0.2s to 1.0s.

[0037] Furthermore, the first time period and the second time period satisfy the following: .

[0038] In continuous assembly line operations, if the relaxation period accounts for too long, the bamboo material continuously fed in from the front end is very likely to accumulate longitudinally between the two pressure zones, causing the bamboo board surface to arch upwards or even break and block the material in production accidents.

[0039] By limiting At least for With a speed 1.5 times that of the standard, the system maintains traction-driven operation at all times, ensuring that the entire roller pressing and gluing production line can achieve deep wetting while still maintaining smooth continuous material feeding and production stability.

[0040] In a preferred embodiment, the subsequent pressure zone 2 includes an upper pressure roller and a lower pressure roller arranged opposite each other. Simultaneously with the application of the second-stage roller pressure stress, the system sets the drive linear speed of the upper pressure roller to be... The driving linear speed of the lower pressure roller is Real-time control A differential ratio of 0.5% to 2.0% is formed between them.

[0041] In the traditional roller pressing process, the upper and lower rollers move at the same speed, and the bamboo is subjected to only pure vertical pressure. This causes the longitudinal vascular bundles inside the bamboo to be flattened. Although it can promote the longitudinal downward penetration of the adhesive, the transverse channels between the fiber bundles remain closed, and the adhesive cannot achieve three-dimensional network diffusion.

[0042] In this embodiment, by creating a differential speed ratio of 0.5% to 2.0%, when the upper and lower pressure rollers contact the bamboo surface, they will apply a pair of horizontal frictional force differences in opposite directions between the upper and lower surfaces of the bamboo due to the inconsistent speeds. This forces the longitudinal vascular bundles inside the bamboo to undergo slight transverse twisting and misalignment, increasing the openness of the fiber contact interface and facilitating the transverse diffusion of the adhesive.

[0043] Furthermore, if the differential speed ratio is less than 0.5%, the relative displacement between fiber bundles is limited, making it difficult to form an effective lateral diffusion path; if the differential speed ratio is greater than 2.0%, the lateral shear force is too large, which can easily cause damage between the fiber layers of bamboo and affect the overall structural strength of the board.

[0044] Based on this, the adhesive that originally remained in the shallow layer or a single longitudinal pore in step S1 will laterally penetrate along the misaligned interface between the fibers under the downward pushing of the second-stage roller pressure, increasing the actual contact and cross-linking area between the adhesive and the bamboo fiber.

[0045] In a preferred embodiment, in step S1, the system controls the temperature of the adhesive injected into the initial pressure zone 1 to be between 85°C and 95°C in terms of thermal dynamics; while in step S2, the system uses an internal circulation cooling method to keep the working surface temperature of the second-level rolling stress in a cold pressing state of 15°C to 25°C.

[0046] First, the high temperature reduces the dynamic viscosity of the polymer adhesive, giving it a fluidity similar to an aqueous solution. This allows the adhesive to slide into the cracks on the bamboo surface with minimal frictional resistance under the initial roller pressure stress. Simultaneously, the high temperature significantly enhances the adhesive's wetting ability into the natural pores of the bamboo.

[0047] When the bamboo carrying the high-temperature adhesive continuously moves to the subsequent pressure zone 2 in step S2, it comes into contact with the cold-pressing working surface at 15°C to 25°C. Under the physical contact of the cold roller, the temperature of the adhesive covering the surface of the bamboo drops rapidly, and its dynamic viscosity gradually increases and thickens.

[0048] Therefore, by combining the high-viscosity adhesive layer with the inward pushing force provided by the second-stage roller pressure, the outward overflow of the low-viscosity adhesive during secondary pressure is effectively avoided, which is conducive to further improving the retention and penetration depth of the adhesive inside the bamboo, thereby obtaining better saturation.

[0049] like Figure 4 As shown, in a preferred embodiment, during the process, the control system first acquires the current linear speed of the bamboo in real time and uses this as a reference parameter to dynamically control the injection flow rate of the adhesive. More specifically, the system controls the matching relationship between the flow rate and the bamboo feed, so that the flowing adhesive accumulates in large quantities at the engagement front end between the rotating roller surface and the bamboo surface in the initial pressure zone 1, thereby forming a retained adhesive bag 4.

[0050] In the initial pressure zone 1, the rotating roller surface and the forward-moving bamboo form an inwardly converging wedge-shaped space 3. Due to the strong viscosity of the polymer adhesive itself, when the rotating roller surface and the bamboo jointly drive the adhesive to move towards the extremely narrow part of the converging wedge-shaped space 3, the fluid is squeezed, thereby generating a high hydrodynamic pressure inside the adhesive pack 4.

[0051] At this time, by adjusting the ratio of the travel line speed to the glue injection flow rate, the pressure distribution curve of the fluid in the wedge-shaped space is reshaped, so that the peak point of the maximum fluid dynamic pressure generated inside the glue pack 4 is advanced in spatial position, that is, positioned in front of the physical interlocking line where the pressure roller and the bamboo material make direct contact.

[0052] Therefore, by combining the high-viscosity adhesive layer with the inward pushing force provided by the second-stage roller pressure, the outward overflow of the low-viscosity adhesive during secondary pressure is effectively avoided, which is conducive to further improving the retention and penetration depth of the adhesive inside the bamboo, thereby obtaining better saturation.

[0053] like Figure 4 As shown, in a preferred embodiment, during the process, the control system first acquires the current linear speed of the bamboo in real time and uses this as a reference parameter to dynamically control the injection flow rate of the adhesive. More specifically, the system controls the matching relationship between the flow rate and the bamboo feed, so that the flowing adhesive accumulates in large quantities at the engagement front end between the rotating roller surface and the bamboo surface in the initial pressure zone 1, thereby forming a retained adhesive bag 4.

[0054] In the initial pressure zone 1, the rotating roller surface and the forward-moving bamboo form an inwardly converging wedge-shaped space 3. Due to the strong viscosity of the polymer adhesive itself, when the rotating roller surface and the bamboo jointly drive the adhesive to move towards the extremely narrow part of the converging wedge-shaped space 3, the fluid is squeezed, thereby generating a high hydrodynamic pressure inside the adhesive pack 4.

[0055] At this time, by adjusting the ratio of the travel line speed to the glue injection flow rate, the pressure distribution curve of the fluid in the wedge-shaped space is reshaped, so that the peak point of the maximum fluid dynamic pressure generated inside the glue pack 4 is advanced in spatial position, that is, positioned in front of the physical interlocking line where the pressure roller and the bamboo material make direct contact.

[0056] After acquiring the identification signal of the local dense area, the system waits for a preset delay time and then synchronously reduces the current glue application rate according to a set attenuation ratio. When the bamboo joint passes through the glue application area, the system reduces the flow rate by 50% to 70% according to the attenuation ratio in a preferred mode, and applies the glue. Because the bamboo joint itself lacks pores and cannot absorb a large amount of glue, the attenuated glue amount meets the basic wetting requirements of its surface, effectively suppressing the overflow phenomenon caused by excess glue accumulation on the hard surface. Subsequently, after the bamboo joint area has completely passed through the glue application area, the initial high glue application rate is restored to ensure that the subsequent high-porosity bamboo interstices can receive sufficient glue for deep wetting.

[0057] The preset delay time ranges from 0.1 seconds to 0.5 seconds.

[0058] In a preferred embodiment, when the bamboo material exits the subsequent pressure zone 2, a large amount of free residual adhesive carrying small air bubbles has been squeezed out from its surface. A follow-up scraper assembly is installed at the discharge end of the subsequent pressure zone 2 to collect the excess adhesive. The collected excess adhesive is introduced into a filtration assembly for impurity removal and purification. The purified recycled adhesive, according to a predetermined ratio, in a preferred embodiment, at a mass fraction of 15% to 25%, is injected into a new adhesive matrix for mixing. Finally, the mixed adhesive is returned to the adhesive supply system of the initial pressure zone 1 for cyclic application.

[0059] like Figure 3 As shown, in a preferred embodiment, traditional vertical glue application or disordered spraying easily generates turbulence and splashing on the liquid surface, causing a large amount of air to be directly drawn into the glue pack, thereby disrupting subsequent wetting. Therefore, in this embodiment, the jet angle of the glue injection nozzle is adjusted so that an acute angle of 30° to 45° is formed between the center line of the glue jet and the horizontal trajectory of the bamboo.

[0060] Furthermore, the landing point of the control jet centerline is positioned in an offset area 10mm to 20mm above the center point of the arc surface of the rotating roller.

[0061] The reason is that if the adhesive is injected vertically directly into the flat bamboo surface or directly impacted at the interlocking front end, the adhesive is very likely to spread out disorderly and generate splashing and air entanglement. However, if the landing point is set in the offset area of ​​the rotating roller surface, the jet adhesive will be captured after contacting the metal roller surface and will be smoothly transported to the interlocking front end below in the form of adhering to the wall along the rotation trajectory of the roller surface. This allows the adhesive to continuously accumulate at the interlocking front end between the rotating roller surface and the bamboo surface, thereby forming a bubble-free residual adhesive pack 4.

[0062] 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 variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A roller pressing adhesive application process, characterized in that, Includes the following steps: S1. The bamboo material to be processed is continuously moved along a predetermined trajectory, and a first-level roller stress is continuously applied to the entire surface of the bamboo material in the initial pressure zone of the moving path. During the process of the bamboo being deformed under pressure, adhesive is continuously sprayed onto its surface to force the adhesive into the shallow fiber pores of the bamboo. S2. Maintain the continuous movement of the bamboo material and apply a second-level roller pressure stress to the bamboo material with the adhesive in the subsequent pressure zone; use the second-level roller pressure stress to force the surface adhesive to continuously penetrate into the deep layer of the bamboo fiber and to homogenize the thickness of the adhesive layer on the surface of the bamboo material, so as to squeeze out the air bubbles and excess adhesive wrapped inside the adhesive layer. S3. Guide the bamboo material away from the second-stage roller pressure stress zone, so that it continues to be conveyed along the discharge trajectory under normal pressure; control the conveying time of the bamboo material under normal pressure to reach a predetermined threshold, so that the glue that has penetrated into the fiber can be initially cured, and then the finished product is collected.

2. The roller pressing and gluing process according to claim 1, characterized in that, The initial pressure zone and the subsequent pressure zone are respectively set with stress magnitude by adjusting the roller gap; The initial thickness of the bamboo material to be processed is set as follows: The roller gap in the initial pressure zone is controlled to be... The roller gap in the subsequent pressure zone is And satisfy: ; In step S1, the first-level rolling stress is applied to the bamboo material by means of dot matrix pressing or mesh engraving.

3. The roller pressing and gluing process according to claim 1, characterized in that, During the execution of steps S1 and S2, the following steps are synchronized: The initial pressure zone is set to have a constant first conveying linear velocity. And control the second conveyor line speed of the subsequent pressure zone. According to the predetermined cycle Perform alternating fluctuation regulation; In each cycle Inside, regarding the The alternating fluctuation adjustment steps include: Will Increase to greater than The first speed threshold, and maintain it for the first time period. This keeps the bamboo material in a longitudinally stretched tension state between the two pressure zones; Then Reduce to equal to The second speed threshold, and maintained for the second time period. This allows the bamboo material to be in a relaxed state where the longitudinal tension is released.

4. The roller pressing and gluing process according to claim 3, characterized in that, First time period The range of values ​​is limited to s; Second time period The range of values ​​is limited to s; Furthermore, the first time period and the second time period are set to satisfy: .

5. The roller pressing and gluing process according to claim 4, characterized in that, The subsequent pressure zone includes an upper pressure roller and a lower pressure roller arranged opposite to each other; In step S2, the driving linear speed of the upper pressure roller is set to... The driving linear velocity of the lower pressure roller is Real-time control of the With the Forming between The differential ratio.

6. The roller pressing and gluing process according to claim 1, characterized in that, Between step S1 and step S2, the following steps are also included: In step S1, the temperature of the adhesive liquid injected into the initial pressure zone is controlled to be... In step S2, the working surface temperature for applying the second-stage rolling stress is at... The cold-pressed state.

7. The roller pressing and gluing process according to claim 1, characterized in that, In step S1, the adhesive injection step for the initial pressure zone includes: Real-time acquisition of the current travel speed of the bamboo; Control the injection flow rate of the coating adhesive so that the adhesive accumulates at the interlocking front end of the rotating roller surface in the initial pressure zone and the bamboo surface, forming a retained adhesive bag; Adjust the ratio of the travel line speed to the glue injection flow rate so that the peak point of the maximum hydrodynamic pressure generated inside the glue pack is spatially ahead of the physical interlocking line of the initial pressure zone.

8. The roller pressing and gluing process according to claim 1, characterized in that, Step S1 further includes the following steps: Real-time monitoring of the operating torque of the drive motor performing the rolling action in the initial pressure zone; When the amplitude of the fluctuation in the operating torque exceeds a preset torque threshold, a local dense region identification signal is generated; Based on the identification signal of the local dense area, after a preset delay time, the current injection flow rate of the coating adhesive is synchronously reduced according to a set attenuation ratio, and then restored to the initial injection flow rate after a set duration.

9. The roller pressing and gluing process according to claim 1, characterized in that, In step S2, after removing the air bubbles and excess adhesive from the inside of the adhesive layer, the following steps are also included: At the discharge end of the subsequent pressure zone, the excess adhesive liquid physically squeezed from the surface of the bamboo is collected by a follow-up scraper; the collected excess adhesive liquid is introduced into a constant temperature filter assembly for impurity removal and purification; the purified adhesive liquid is mixed with newly prepared adhesive liquid in a predetermined ratio and returned to the adhesive supply system of the initial pressure zone for cyclic application.

10. The roller pressing and gluing process according to claim 7, characterized in that, The step of controlling the injection flow rate of the coating adhesive to allow the adhesive to accumulate at the interlocking front end between the rotating roller surface in the initial pressure zone and the bamboo surface further includes: Adjust the jet angle of the adhesive injection nozzle so that the center line of the adhesive jet forms an angle of 30° to 45° with the horizontal trajectory of the bamboo material, and control the landing point of the jet center line to be located in an offset area 10mm to 20mm above the center point of the arc surface of the rotating roller.

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