Molded pulp hot press molding process

Abstract

The invention discloses a paper pulp molding hot press molding process. The molding process comprises the following steps: S1, data acquisition and parameter initialization; s2, a multi-stage temperature control process; s3, humidity cooperative adjustment; s4, dynamically adjusting the hot pressing time; and S5, storing the temperature, humidity and time data of each forming in a database, analyzing historical data, and optimizing a multi-stage temperature control and humidity adjustment strategy. The heating temperature can be dynamically adjusted according to the actual humidity change of the paper pulp, the situation that the surface of the paper pulp is uneven or cracks occur due to the fact that the humidity is too high or too low in the heating process is avoided, and the heating time of each stage is flexibly adjusted according to real-time feedback data through a hot pressing time dynamic adjustment mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of pulp molding hot pressing, in particular to a pulp molding hot pressing forming process. Background Art

[0002] Pulp molding hot pressing process is widely used in the production of various environmentally friendly products, especially packaging materials and disposable products. This process heats the wet pulp to a certain temperature and presses it in a mold to finally form a pulp product of the desired shape. In order to improve the quality and production efficiency of the molded products, precise control of temperature and humidity has become a key factor.

[0003] At present, the temperature and humidity regulation in many pulp molding hot pressing processes mainly relies on fixed heating temperature and humidity control, lacking real-time feedback and adjustment mechanisms. Due to the large differences in parameters such as density and humidity of the pulp material itself, traditional processes are often difficult to ensure consistency between different production batches, resulting in quality fluctuations in molded products. In addition, the existing technology lacks coordinated dynamic regulation of temperature and humidity, and cannot effectively deal with the production difficulties caused by changes in pulp humidity, resulting in cracking or unevenness on the pulp surface during the heating process. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the problems existing in the above-mentioned existing pulp molding hot pressing forming process, the present invention is proposed.

[0006] Therefore, the purpose of the present invention is to provide a pulp molding hot pressing process, which is suitable for solving the production difficulties caused by the lack of coordinated dynamic regulation of temperature and humidity, and the inability to effectively cope with the changes in pulp humidity, which may lead to cracking or unevenness on the pulp surface during the heating process.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a pulp molding hot pressing forming process, the forming process comprising the following steps:

[0008] S1: data collection and parameter initialization;

[0009] S2: Multi-stage temperature control process, including the following stages:

[0010] Initial preheating stage: preliminary heating is used to evenly distribute the moisture in the pulp and prevent the surface from hardening prematurely;

[0011] Medium temperature shaping stage: Based on the humidity feedback data at the end of the initial preheating stage, the temperature is gradually raised to the medium temperature zone to soften the pulp fibers and promote their uniform adhesion to the mold surface;

[0012] High temperature setting stage: Raise the temperature to the high temperature zone to complete the final setting and surface hardening of the pulp;

[0013] S3: Humidity coordinated regulation;

[0014] S4: Dynamic adjustment of hot pressing time;

[0015] S5: Store the temperature, humidity and time data of each molding in the database, analyze the historical data, optimize the multi-stage temperature control and humidity adjustment strategy, and construct the temperature and humidity adjustment factor calculation formula.

[0016] As a preferred embodiment of the pulp molding hot pressing process of the present invention, wherein:

[0017] The temperature and humidity adjustment factor calculation formula is as follows:

[0018]

[0019] F stage is the stage temperature and humidity adjustment factor, n is the number of process stages, indicating the adjustment requirements between multiple temperature and humidity adjustment stages, α i represents the temperature and humidity adjustment factor of the i-th stage, and represents the sensitivity of the temperature and humidity adjustment in this stage, D i is the physical property of pulp at stage i, affecting the temperature and humidity regulation effect at this stage, δ i is the influence of pulp characteristics on temperature and humidity regulation, γ i is the influence coefficient of temperature on the temperature and humidity adjustment factor, indicating the weight of temperature on humidity adjustment, T i represents the temperature of the i-th stage, which changes with time. ref The reference humidity is the standard humidity set by the process, which is used to compare the difference between the current humidity and the standard humidity. current is the humidity value at the current stage, β is the influence weight of humidity on the adjustment factor, which controls the contribution of humidity change to the adjustment factor.

[0020] As a preferred solution of the pulp molding hot pressing process of the present invention, wherein: in the output result of the temperature and humidity adjustment factor calculation formula;

[0021] If F stage >1, indicating that the temperature and humidity regulation requirements are high at this stage, and the temperature or humidity regulation intensity needs to be increased;

[0022] If F stage≤1, indicating that the temperature and humidity conditions at the current stage meet the requirements and do not require further adjustment.

[0023] As a preferred solution of the pulp molding hot pressing process described in the present invention, a multi-stage temperature control and humidity adjustment formula is constructed according to the output result of the temperature and humidity adjustment factor calculation formula, and the multi-stage temperature control and humidity adjustment formula is as follows:

[0024]

[0025] Among them, t adj Dynamically adjusted hot pressing time, t base Is the basic heat pressing time.

[0026] As a preferred solution of the pulp molding hot pressing forming process of the present invention, wherein: in the output result of the multi-stage temperature control and humidity adjustment formula;

[0027] If t adj >t base , indicating that the heat pressing time needs to be increased;

[0028] If t adj <t base , indicating that the heat pressing time needs to be reduced;

[0029] If t adj =t base , indicating that the heat pressing time does not need to be adjusted.

[0030] As a preferred embodiment of the pulp molding hot pressing process of the present invention, wherein: adj That is, the temperature and humidity adjustment factor F according to the stage stage and the current humidity H current Adjust the hot pressing time, t base This is the standard hot pressing time without adjustment factors.

[0031] As a preferred solution of the pulp molding hot pressing forming process of the present invention, the following sub-steps are specifically included in S1:

[0032] S11: Sensor arrangement: Temperature sensors and humidity sensors are arranged inside and around the hot pressing mold, and during the pulp conveying stage, the thickness and density of the pulp are detected by using a thickness sensor and a density measuring device;

[0033] S12: Data collection: The collected pulp thickness, humidity and density parameters are transmitted to the central control platform through the data collection module;

[0034] S13: Initialization parameters: according to the type, thickness, humidity and density of the pulp, set the initial heating temperature and humidity adjustment range, set the temperature gradient of the multi-stage heating and the time period of each stage.

[0035] As a preferred solution of the pulp molding hot pressing forming process described in the present invention, the temperature and humidity coordinated adjustment is achieved by the following steps:

[0036] S31: The humidity sensor detects the humidity change in the mold in real time;

[0037] S32: if the humidity is too high, the output of the humidifier in the mold is reduced, and the heating time of the current stage is extended; if the humidity is too low, the humidity is increased by the humidifier to prevent the pulp surface from being too dry and causing defects;

[0038] S33: Humidity adjustment works in conjunction with temperature control to correct the temperature and humidity parameters of the next stage in real time based on the humidity feedback results.

[0039] As a preferred solution of the pulp molding hot pressing forming process described in the present invention, the pulp properties include the thickness and density of the pulp.

[0040] As a preferred embodiment of the pulp molding hot pressing process of the present invention, wherein: stage Calculated based on temperature, humidity and pulp characteristics, reflecting the adjustment requirements at each stage, δ i Adjust the adjustment factor as the pulp properties change.

[0041] The beneficial effects of the present invention are as follows: by combining data acquisition with a multi-stage temperature control process, real-time monitoring of key parameters such as pulp humidity, density and thickness can be achieved. In particular, the humidity sensor and temperature regulation work together to dynamically adjust the heating temperature according to the actual humidity change of the pulp, so as to prevent the pulp surface from being uneven or cracked due to excessively high or low humidity during the heating process. Through the dynamic adjustment mechanism of the hot pressing time, the heating time of each stage can be flexibly adjusted according to the real-time feedback data. This process combines temperature and humidity feedback, and by adjusting the heating time of each stage, the pulp molding process can be adaptively adjusted according to different pulp types and external environmental conditions.

[0042] By continuously accumulating temperature, humidity, thickness and density data during the production process, analyzing and optimizing multi-stage temperature control and humidity adjustment strategies, this strategy can automatically adjust the temperature control and humidity adjustment factors based on historical data, so that the production process can be continuously optimized over time, gradually improving molding quality and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0044] Figure 1 A schematic diagram of the overall steps of a pulp molding hot pressing process proposed by the present invention;

[0045] Figure 2 This is a schematic diagram of the implementation steps of humidity coordinated regulation in a pulp molding hot pressing process proposed by the present invention. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0048] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0049] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0050] Embodiment 1

[0051] Reference Figure 1-Figure 2 , as an embodiment of the present invention, provides a pulp molding hot pressing forming process, the forming process comprises the following steps:

[0052] S1: data acquisition and parameter initialization;

[0053] S11: Sensor arrangement: Temperature sensors and humidity sensors are arranged inside and around the hot pressing mold. The model of the temperature sensor is K-type thermocouple: Omega 5TC-TT-K-40. Its working principle is to measure the temperature by using the voltage difference generated at the contact point of two different metal conductors when the temperature changes. The model of the humidity sensor is Faztek DHT22 temperature and humidity sensor. Its working principle is to determine the humidity in the air by measuring the influence of humidity change on the capacitance value. The sensor usually contains a capacitor with a hygroscopic medium sandwiched between two electrodes. When the air humidity changes, the hygroscopicity of the medium changes, resulting in a change in the capacitance value, thereby measuring the humidity;

[0054] During the pulp conveying stage, the thickness and density of the pulp are detected by using a thickness sensor and a density measuring device. The thickness sensor is Panametrics 38DL PLUS, and its working principle is to measure the thickness of an object by using the propagation time of sound waves passing through the object. The sensor sends ultrasonic pulses, and the sound waves propagate in the object and reflect back. The thickness of the object is calculated based on the propagation time. The density measuring device uses a laser particle size analyzer, model: Malvern Mastersizer 3000, which uses the principle of laser scattering to analyze the size distribution of particles according to the scattering angle and intensity of the particles, thereby inferring the density of the object. For materials such as pulp, their density can be detected by a density measuring instrument to understand their mass distribution;

[0055] S12: Data collection: The collected pulp thickness, humidity and density parameters are transmitted to the central control platform through the data collection module;

[0056] S13: Initializing parameters: according to the type, thickness, humidity and density of the pulp, setting the initial heating temperature and humidity adjustment range, setting the temperature gradient of multi-stage heating and the time period of each stage;

[0057] S2: Multi-stage temperature control process, including the following stages:

[0058] Initial preheating stage: preliminary heating is used to evenly distribute the moisture in the pulp and prevent the surface from hardening prematurely;

[0059] Medium temperature shaping stage: Based on the humidity feedback data at the end of the initial preheating stage, the temperature is gradually raised to the medium temperature zone to soften the pulp fibers and promote their uniform adhesion to the mold surface;

[0060] High temperature setting stage: Raise the temperature to the high temperature zone to complete the final setting and surface hardening of the pulp;

[0061] Through this three-stage temperature control process, the moisture distribution of the pulp is ensured to be uniform, and the influence of too fast or too slow heating on the quality of the pulp is avoided by gradually increasing the temperature, thereby improving the consistency and stability of the formed product;

[0062] S3: Humidity coordinated regulation;

[0063] S31: The humidity sensor detects the humidity change in the mold in real time;

[0064] S32: if the humidity is too high, the output of the humidifier in the mold is reduced, and the heating time of the current stage is extended; if the humidity is too low, the humidity is increased by the humidifier to prevent the pulp surface from being too dry and causing defects;

[0065] S33: Humidity adjustment works in conjunction with temperature control to correct the temperature and humidity parameters of the next stage in real time according to the humidity feedback results;

[0066] The collaborative working mechanism of dynamic humidity control and temperature adjustment can provide the best humidity conditions for each stage, improve the stability of molding, and reduce molding defects such as cracks and demoulding difficulties;

[0067] S4: Dynamic adjustment of hot pressing time;

[0068] Through the dynamic adjustment of hot pressing time, not only the production flexibility is improved, but also the optimized production can be achieved under different pulp characteristics and production environments, further improving product quality and consistency;

[0069] S5: Store the temperature, humidity and time data of each molding in the database, analyze the historical data, optimize the multi-stage temperature control and humidity adjustment strategy, and construct the temperature and humidity adjustment factor calculation formula;

[0070] This data-driven optimization mechanism has strong adaptive capabilities and can automatically adjust process parameters according to different conditions (such as pulp type, ambient humidity, etc.), thereby improving the stability and long-term efficiency of the production process.

[0071] The calculation formula of temperature and humidity adjustment factor is as follows:

[0072]

[0073] F stage is the stage temperature and humidity adjustment factor, which is calculated based on the temperature, humidity and pulp characteristics, reflecting the adjustment requirements of each stage. n is the number of stages in the process, indicating the adjustment requirements between multiple temperature and humidity adjustment stages. i represents the temperature and humidity adjustment factor of the i-th stage, and represents the sensitivity of the temperature and humidity adjustment in this stage, D i is the physical property of pulp at stage i, affecting the temperature and humidity regulation effect at this stage, δ iis the influence of pulp properties (thickness and density) on temperature and humidity regulation. The regulation factor is adjusted as the pulp properties change. i is the influence coefficient of temperature on the temperature and humidity adjustment factor, indicating the weight of temperature on humidity adjustment, T i represents the temperature of the i-th stage, which changes with time. ref The reference humidity is the standard humidity set by the process, which is used to compare the difference between the current humidity and the standard humidity. current is the humidity value at the current stage, β is the influence weight of humidity on the adjustment factor, which controls the contribution of humidity change to the adjustment factor.

[0074] In the output result of the temperature and humidity adjustment factor calculation formula;

[0075] If F stage >1, indicating that the temperature and humidity regulation requirements are high at this stage, and the temperature or humidity regulation intensity needs to be increased;

[0076] If F stage ≤1, indicating that the temperature and humidity conditions at the current stage meet the requirements and do not require further adjustment.

[0077] A multi-stage temperature control and humidity adjustment formula is constructed according to the output result of the temperature and humidity adjustment factor calculation formula, and the multi-stage temperature control and humidity adjustment formula is as follows:

[0078]

[0079] Among them, t adj The hot pressing time after dynamic adjustment is adjusted according to the stage temperature and humidity adjustment factor F stage and the current humidity H current Adjust the hot pressing time, t base It is the basic heat pressing time, the standard heat pressing time without adjustment factors.

[0080] In the output of the multi-stage temperature control and humidity regulation formula;

[0081] If adj >t base , indicating that the heat pressing time needs to be increased;

[0082] If adj <t base , indicating that the heat pressing time needs to be reduced;

[0083] If adj =t base , indicating that the heat pressing time does not need to be adjusted.

[0084] By adopting a multi-stage temperature control and humidity coordinated adjustment strategy, the present invention can dynamically adjust the heating temperature and humidity at different stages, effectively avoiding surface over-drying, cracks or unevenness, and ensuring the overall quality and appearance consistency of the molded products. At the same time, the dynamic adjustment mechanism of the hot pressing time flexibly optimizes the production process according to real-time feedback data, further improving production efficiency and reducing resource waste.

[0085] Embodiment 2

[0086] Referring to Tables 1-3, which are the second embodiment of the present invention, this embodiment is different from the first embodiment in that, in order to verify its beneficial effects, experimental comparison data between the present invention and the prior art are provided.

[0087] In order to verify the innovation and advantages of the present invention in the pulp molding hot pressing process, we prepared two groups of pulp molding samples for comparative experiments. Experimental Group 1 adopted the existing traditional process, while Experimental Group 2 adopted the multi-stage temperature control and humidity adjustment scheme of the present invention. During the test, the same type of pulp was used, and the thickness, humidity and density parameters were fixed. These key indicators were monitored and recorded in real time by sensors.

[0088] The specific experimental steps are as follows:

[0089] In experimental groups 1 and 2, temperature sensors, humidity sensors, and thickness and density measuring devices were first installed inside the mold, and the initial parameters of the pulp were set according to the type, humidity, and thickness: Group 1 used the traditional fixed temperature control process, while Group 2 set the multi-stage heating temperature, humidity range, and time period for each stage based on the initial data.

[0090] Group 2 evenly distributes the moisture in the pulp through preliminary heating to prevent premature hardening of the surface, while Group 1 uses traditional constant temperature heating mode without considering humidity changes; based on humidity feedback data, Group 2 gradually increases the temperature to the medium temperature zone to ensure uniform softening of the pulp fibers; while Group 1 continues to use a single temperature setting for heating; Group 2 finally increases to the high temperature zone to complete pulp shaping and surface hardening. The temperature and humidity of the entire process are precisely adjusted based on real-time feedback.

[0091] Group 2 uses a humidity sensor to detect humidity changes in real time and adjusts the output of the humidifier based on the data to ensure that the output is reduced when the humidity is too high and increased when the humidity is too low. In Group 2, the hot pressing time is dynamically adjusted based on the real-time feedback of temperature and humidity data. After each stage, the system will adjust the time to ensure the consistency of the molded products. Group 1 uses a fixed hot pressing time.

[0092] Table 1: Comparison of experimental group data

[0093] parameter Group 1 (Prior Art) Group 2 (the present invention) Initial pulp thickness (mm) 3.5 3.5 Initial humidity (%) 50 50 <![CDATA[Initial density (g / cm 3 )]]> 0.45 0.45 Initial heating temperature (℃) 70 70 Initial humidity control range Fixed value 50% Dynamic range (40%-60%) Warm-up time (minutes) 5 5 Medium temperature stage temperature (℃) 90 85-95 High temperature stage temperature (℃) 110 120 Molding time (minutes) 15 Dynamic adjustment (15-18)

[0094] Table 2: Comparison of final product quality

[0095]

[0096]

[0097] Table 3: Temperature and humidity control feedback data table

[0098]

[0099] By comparing the data in Tables 1 to 3 above, it is obvious that the present invention is superior to the prior art in many aspects, which can be specifically analyzed from the following three aspects:

[0100] Temperature and humidity control accuracy: Group 2 uses a dynamic humidity control range (40%-60%), which is significantly better than the fixed humidity control of Group 1. Table 3 shows that the humidity variation range is small, ensuring the humidity balance at each stage and avoiding the influence of humidity discomfort on molding quality.

[0101] Molding quality: Table 2 shows that the molding accuracy of group 2 is ±0.2mm, while that of group 1 is ±1.0mm, which indicates that group 2 can better ensure the consistency and accuracy of the molded products. The comparison of surface defect rates also shows that the humidity and temperature regulation of group 2 work together to avoid the defects of excessive surface dryness or uneven humidity, and the molding quality has been significantly improved;

[0102] Dynamic hot pressing time adjustment: In Table 1, the hot pressing time of Group 2 is dynamically adjusted and can be optimized according to feedback data to ensure the best effect in each stage. However, Group 1 uses a fixed time setting and cannot flexibly respond to changes under different conditions, which affects the final quality of the product.

[0103] In summary: Through the analysis of experimental data, the present invention has demonstrated innovation in many aspects. Innovative measures such as dynamic temperature and humidity control and dynamic adjustment of hot pressing time have significantly improved the precision and quality of the product, while reducing the surface defect rate. Compared with the prior art, the present invention can achieve more precise temperature and humidity adjustment and hot pressing control, improve production efficiency, and ensure the consistency and high quality of the molded products, reflecting its unique advantages in the pulp molding hot pressing process.

[0104] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A pulp molding hot pressing process, characterized in that: The molding process comprises the following steps: S1: data collection and parameter initialization; S2: Multi-stage temperature control process, including the following stages: Initial preheating stage: preliminary heating is used to evenly distribute the moisture in the pulp and prevent the surface from hardening prematurely; Medium temperature shaping stage: Based on the humidity feedback data at the end of the initial preheating stage, the temperature is gradually raised to the medium temperature zone to soften the pulp fibers and promote their uniform adhesion to the mold surface; High temperature setting stage: Raise the temperature to the high temperature zone to complete the final setting and surface hardening of the pulp; S3: Humidity coordinated regulation; S4: Dynamic adjustment of hot pressing time; S5: Store the temperature, humidity and time data of each molding in the database, analyze the historical data, optimize the multi-stage temperature control and humidity adjustment strategy, and construct the temperature and humidity adjustment factor calculation formula.

2. A pulp molding hot pressing process according to claim 1, characterized in that: The temperature and humidity adjustment factor calculation formula is as follows: F stage is the stage temperature and humidity adjustment factor, n is the number of process stages, indicating the adjustment requirements between multiple temperature and humidity adjustment stages, α i represents the temperature and humidity adjustment factor of the i-th stage, and represents the sensitivity of the temperature and humidity adjustment in this stage, D i is the physical property of the pulp at stage i, affecting the temperature and humidity adjustment effect at this stage, δ i is the influence of pulp characteristics on temperature and humidity regulation, γ i is the influence coefficient of temperature on the temperature and humidity adjustment factor, indicating the weight of temperature on humidity adjustment, T i represents the temperature of the i-th stage, which changes with time. ref The reference humidity is the standard humidity set by the process, which is used to compare the difference between the current humidity and the standard humidity. current is the humidity value at the current stage, β is the influence weight of humidity on the adjustment factor, which controls the contribution of humidity change to the adjustment factor.

3. A pulp molding hot pressing process according to claim 2, characterized in that: In the output result of the temperature and humidity adjustment factor calculation formula; If F stage >1, indicating that the temperature and humidity regulation requirements are high at this stage, and the temperature or humidity regulation intensity needs to be increased; If F stage ≤1, indicating that the temperature and humidity conditions at the current stage meet the requirements and do not require further adjustment.

4. A pulp molding hot pressing process according to claim 2, characterized in that: A multi-stage temperature control and humidity adjustment formula is constructed according to the output result of the temperature and humidity adjustment factor calculation formula, and the multi-stage temperature control and humidity adjustment formula is as follows: Among them, t adj Dynamically adjusted hot pressing time, t base Is the basic heat pressing time.

5. A pulp molding hot pressing process according to claim 4, characterized in that: In the output of the multi-stage temperature control and humidity regulation formula; If adj >t base , indicating that the heat pressing time needs to be increased; If adj <t base , indicating that the heat pressing time needs to be reduced; If adj =t base , indicating that the heat pressing time does not need to be adjusted.

6. A pulp molding hot pressing process according to claim 4, characterized in that: t adj That is, the temperature and humidity adjustment factor F according to the stage stage and the current humidity H current Adjust the hot pressing time, t base This is the standard hot pressing time without adjustment factors.

7. The pulp molding hot pressing process according to claim 1, characterized in that: The S1 specifically includes the following sub-steps: S11: Sensor arrangement: Temperature sensors and humidity sensors are arranged inside and around the hot pressing mold, and during the pulp conveying stage, the thickness and density of the pulp are detected by using a thickness sensor and a density measuring device; S12: Data collection: The collected pulp thickness, humidity and density parameters are transmitted to the central control platform through the data collection module; S13: Initialization parameters: according to the type, thickness, humidity and density of the pulp, set the initial heating temperature and humidity adjustment range, set the temperature gradient of the multi-stage heating and the time period of each stage.

8. The pulp molding hot pressing process according to claim 1, characterized in that: The temperature and humidity coordinated regulation is achieved by the following steps: S31: The humidity sensor detects the humidity change in the mold in real time; S32: if the humidity is too high, the output of the humidifier in the mold is reduced, and the heating time of the current stage is extended; if the humidity is too low, the humidity is increased by the humidifier to prevent the pulp surface from being too dry and causing defects; S33: Humidity adjustment works in conjunction with temperature control to correct the temperature and humidity parameters of the next stage in real time based on the humidity feedback results.

9. The pulp molding hot pressing process according to claim 2, characterized in that: The pulp properties include the thickness and density of the pulp.

10. The pulp molding hot pressing process according to claim 2, characterized in that: F stage Calculated based on temperature, humidity and pulp characteristics, reflecting the adjustment requirements at each stage, δ i Adjust the adjustment factor as the pulp properties change.

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