Novel corn straw paper pulp preparation process

Abstract

The invention relates to the technical field of corn straw paper pulp preparation, and discloses a novel corn straw paper pulp preparation process which comprises the following steps: step 1, identifying and separating damaged or diseased straw parts by using an automatic sorting system and utilizing an image identification technology and a machine learning algorithm; 2, the sorted healthy straw passes through a self-adaptive cutting machine, the blade speed and pressure are automatically adjusted according to the thickness and hardness of the straw, and the straw is cut into uniform length of 5-10 mm; 3, the cut straw passes through a closed-loop supercritical CO2 extraction system, volatile organic compounds and pesticide residues are removed at the pressure of 120-160 bar and the temperature of 40-55 DEG C, and cellulose is reserved; 4, the extracted straw is subjected to low-temperature grinding through a precision wet type grinding system, fiber distribution is adjusted through water flow, and homogeneous slurry is formed. By integrating an advanced technology and an environment-friendly treatment method, not only are the production efficiency and the product quality of the paper pulp improved, but also the environmental sustainability of the production process is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of corn stalk pulp preparation technology, in particular to a novel corn stalk pulp preparation process. Background Art

[0002] In the pulp production industry, the efficiency of raw material utilization and the quality of the final product are key considerations in pulping process design. Corn stover, as an abundant biomass resource, has been widely studied as a raw material for pulping due to its low cost and easy access. Traditional pulping methods extract fibers from plant raw materials by chemical or mechanical means, but these methods often require high quality and uniformity of the raw materials.

[0003] Current technology mainly relies on mechanical and chemical processing to prepare corn stover pulp, which usually includes rough physical cutting and subsequent chemical cooking. These processes are designed to break down plant fibers so that they can be further processed into pulp. In order to improve efficiency and reduce costs, existing pulping processes are constantly seeking innovation and changes, trying to integrate more automation and efficient pre-treatment technologies.

[0004] However, existing corn straw processing technology has certain limitations in the initial processing stage of raw materials. Especially in the sorting and initial cutting process of raw materials, due to the lack of effective automation technology, it is often impossible to ensure that only healthy and disease-free straw is sent to the subsequent chemical treatment, which directly affects the quality and production efficiency of pulp. Improperly treated raw materials may lead to uneven reactions in the chemical treatment stage, increasing the consumption of chemical reagents and production costs. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a new corn straw pulp preparation process, which solves the problem of lack of effective automation technology and often cannot ensure that only healthy and disease-free straw is sent to subsequent chemical treatment, which directly affects the quality and production efficiency of the pulp.

[0006] To achieve the above objectives, the present invention is implemented by the following technical scheme: A novel corn straw pulp preparation process comprises the following steps:

[0007] Step 1: Use an automated sorting system to identify and separate damaged or diseased straw parts using image recognition technology and machine learning algorithms;

[0008] Step 2: The selected healthy straw is cut into uniform lengths of 5-10 mm by an adaptive cutting machine that automatically adjusts the blade speed and pressure according to the thickness and hardness of the straw;

[0009] Step 3: The cut straw is passed through a closed-loop supercritical CO2 extraction system at a pressure of 120-160 bar and a temperature of 40-55°C to remove volatile organic compounds and pesticide residues and retain cellulose;

[0010] Step 4: The extracted straw is ground at low temperature by a precision wet grinding system, and the fiber distribution is adjusted by water flow to form a homogeneous slurry.

[0011] Preferably, the cut straw is treated with low-temperature plasma for 15 minutes to improve the chemical activity and processability of the fiber.

[0012] Preferably, the straw after plasma treatment is subjected to alkali treatment assisted by a magnetic field, using a 10%-20% potassium hydroxide solution and a magnetic field strength of 500-1000 Gauss.

[0013] Preferably, the alkali-treated pulp is subjected to ozone bleaching, the amount of ozone used is 0.5%-1.5%, and the bleaching time is 15-30 minutes.

[0014] Preferably, the bleached pulp is treated with ion exchange resin to remove heavy metals and other inorganic impurities and improve the purity and whiteness of the pulp.

[0015] Preferably, the treated pulp is subjected to ultrasonic-assisted fiber refinement, using an ultrasonic frequency of 40-60 kHz and a duration of 20-40 minutes.

[0016] Preferably, the refined pulp is solidified by cooling gel technology, the solidification temperature is -10 to 0°C, and the solidification time is 1-2 hours.

[0017] Preferably, the solidified pulp gel is vacuum dried at a temperature of 60-80° C. for 3-5 hours.

[0018] Preferably, the dried pulp is finely adjusted by laser to improve the smoothness and uniformity of the finished paper.

[0019] Preferably, the obtained pulp is sprayed with nano-silver particles to form an antibacterial layer for use in producing medical and sanitary paper, and the average particle size of the nano-silver particles is 10-50 nanometers.

[0020] The present invention provides a novel corn straw pulp preparation process, which has the following beneficial effects:

[0021] 1. The automated sorting system of the present invention, through image recognition and machine learning algorithms, can accurately identify and separate damaged or diseased straw, reduce raw material waste, and ensure that only the healthiest straw is used for pulping, thereby improving the quality of the final product.

[0022] 2. The present invention adjusts cutting parameters through an adaptive cutting machine to cope with straws of different thicknesses and hardnesses, thereby achieving more uniform cutting, facilitating subsequent chemical treatment and fiber homogenization, and thus improving the uniformity of pulp and the quality of paper.

[0023] 3. The present invention not only removes volatile organic compounds and pesticide residues through closed-loop supercritical CO2 extraction technology, but also uses recyclable CO2, reducing the impact on the environment and meeting the current requirements for environmental protection and sustainable development.

[0024] 4. The present invention can significantly improve the chemical activity of the fiber, accelerate the chemical reaction rate, and improve the processing efficiency through low-temperature plasma treatment and magnetic field-assisted alkali treatment technology, thereby reducing energy consumption and the use of chemical reagents.

[0025] 5. The present invention can not only effectively remove pigments and heavy metal impurities in pulp through ozone bleaching and ion exchange resin treatment, but also improve the whiteness and purity of pulp, which is particularly important for the production of high-standard paper.

[0026] 6. The present invention makes the fibers more fine and uniform through the application of ultrasonic-assisted fiber refinement and cooling gel technology, thereby enhancing the mechanical strength and uniformity of the paper.

[0027] 7. The antibacterial layer formed by the nano-silver particle spraying treatment on the final pulp of the present invention makes the paper have antibacterial properties, which is suitable for medical and sanitary purposes, and increases the market application scope and added value of the product.

[0028] By integrating advanced technologies and environmentally friendly treatment methods, the process not only improves pulp production efficiency and product quality, but also enhances the environmental sustainability of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1:

[0032] Please refer to the attached Figure 1 The embodiment of the present invention provides a novel corn straw pulp preparation process, comprising the following steps:

[0033] Step 1: Automated sorting system

[0034] Sub-steps:

[0035] The collected corn stalks are first transported to an automated sorting belt.

[0036] A high-resolution camera is used to capture images of straw, and a machine learning algorithm is used to analyze the health of the straw.

[0037] Image recognition technology can identify damaged or diseased straw through features such as color, texture and shape.

[0038] Machine learning algorithms optimize recognition accuracy based on training data and automatically filter out raw materials that do not meet standards.

[0039] This ensures that only healthy, disease-free straw is used for pulp preparation, significantly improving the quality of the final product and reducing waste.

[0040] Step 2: Adaptive cutting machine

[0041] Sub-steps:

[0042] The sorted straw enters the adaptive cutter.

[0043] The speed and pressure of the cutting blades are automatically adjusted according to the thickness and hardness of the straw.

[0044] Adaptive technology allows the machine to adjust blade parameters in real time based on sensor feedback to cut in the most optimized way.

[0045] More uniform cutting provides ideal physical conditions for subsequent chemical treatment and fiber homogenization, helping to improve processing efficiency and pulp quality.

[0046] Step 3: Supercritical CO2 Extraction

[0047] Sub-steps:

[0048] The cut straw is contacted with supercritical CO2 in a closed reactor.

[0049] CO2 dissolves organic matter and residual pesticides in the straw under supercritical conditions.

[0050] Supercritical CO2 has liquid-like density and gas-like diffusion properties, and can penetrate deep into the fibers to effectively extract harmful substances.

[0051] It effectively removes harmful chemicals and pesticide residues while protecting cellulose from being destroyed, thus improving the safety and environmental friendliness of the product.

[0052] Step 4: Precision wet grinding system

[0053] Sub-steps:

[0054] The extracted straw is fed into a water-containing mill for pulverization.

[0055] The distribution of the crushed fibers is adjusted by circulating water to ensure uniform mixing of the fibers.

[0056] The cryogenic grinding process reduces fiber damage due to heat and preserves the original properties of the fiber.

[0057] The fiber distribution is uniform, which significantly improves the quality of pulp and subsequent paper physical properties, such as tensile strength and uniformity.

[0058] Step 5: Low temperature plasma treatment

[0059] Sub-steps:

[0060] The wet-milled slurry is exposed to a low-temperature plasma environment.

[0061] Plasma changes the surface properties of the fiber and increases its chemical activity.

[0062] Plasma can activate the fiber surface, introduce new functional groups, and enhance its reactivity with chemical treatment agents.

[0063] The chemical activity of the fiber is improved, making the subsequent chemical treatment more efficient and uniform.

[0064] Step 6: Magnetic field assisted alkali treatment

[0065] Sub-steps:

[0066] A magnetic field is applied to assist in evenly distributing the alkaline chemical on the fibers.

[0067] The penetration depth and rate of the alkali solution are controlled by adjusting the magnetic field strength.

[0068] The magnetic field affects the arrangement and movement of alkali solution molecules, enhancing their diffusion efficiency in the fibers.

[0069] Ensure more uniform alkali treatment, effectively improve the purity and bleaching efficiency of pulp, and reduce the amount of chemical agents and production costs.

[0070] Step 7: Ozonation Bleaching

[0071] Sub-steps:

[0072] The alkali-treated slurry is reacted with ozone in a sealed environment.

[0073] Control ozone dosage and contact time to maximize bleaching effect.

[0074] Ozone is a strong oxidant that can effectively decompose pigments and residual lignin in pulp.

[0075] It can efficiently remove pigments and impurities from pulp, greatly improve the whiteness and purity of pulp, and provide an efficient solution for environmentally friendly bleaching.

[0076] Step 8: Ion exchange resin treatment

[0077] Sub-steps:

[0078] The bleached pulp is filtered through a column packed with ion exchange resin.

[0079] The resin absorbs heavy metals and inorganic impurities, purifying the pulp.

[0080] Ion exchange resins selectively exchange ions in the pulp through their functional groups to remove harmful substances.

[0081] It can effectively remove heavy metals and other inorganic impurities, further improve the purity and safety of pulp, and is suitable for the production of high-end paper.

[0082] Step 9: Ultrasonic Assisted Fiber Refinement

[0083] Sub-steps:

[0084] The treated pulp is treated in an ultrasonic device.

[0085] The frequency and power of the ultrasound waves are adjusted to optimize the physical properties of the fibers.

[0086] Ultrasonic waves generate tiny bubbles through their high-frequency vibrations, which quickly burst between fibers and thin the fibers through mechanical action.

[0087] Improve the uniformity and fineness of fibers, enhance the smoothness and uniformity of paper, while retaining more fiber length and increasing the strength of paper.

[0088] Step 10: Cooling the gel to solidify

[0089] Sub-steps:

[0090] The refined slurry is gelled under low temperature conditions.

[0091] Temperature and time are controlled to optimize the curing process.

[0092] By cooling, the water in the pulp is partially frozen, and the fibers form a stable network structure during the solidification process.

[0093] The fiber network structure of pulp is optimized, and the mechanical properties and water stability of paper are improved.

[0094] Embodiment 2:

[0095] The embodiment of the present invention provides a novel corn straw pulp preparation process, comprising the following steps:

[0096] Step 1: Automated sorting system

[0097] Sub-steps:

[0098] The collected corn stalks are first transported to an automated sorting belt.

[0099] A high-resolution camera is used to capture images of straw, and a machine learning algorithm is used to analyze the health of the straw.

[0100] Image recognition technology can identify damaged or diseased straw through features such as color, texture and shape.

[0101] Machine learning algorithms optimize recognition accuracy based on training data and automatically filter out raw materials that do not meet standards.

[0102] This ensures that only healthy, disease-free straw is used for pulp preparation, significantly improving the quality of the final product and reducing waste.

[0103] Step 2: Adaptive cutting machine

[0104] Sub-steps:

[0105] The sorted healthy straw is cut by an adaptive cutter.

[0106] The speed and pressure of the cutting blades are automatically adjusted according to the thickness and hardness of the straw.

[0107] Adaptive technology allows the machine to adjust blade parameters in real time based on sensor feedback to cut in the most optimized way.

[0108] More uniform cutting provides ideal physical conditions for subsequent chemical treatment and fiber homogenization, helping to improve processing efficiency and pulp quality.

[0109] Step 3: Supercritical CO2 Extraction

[0110] Sub-steps:

[0111] The cut straw is contacted with supercritical CO2 in a closed reactor.

[0112] CO2 dissolves organic matter and residual pesticides in the straw under supercritical conditions.

[0113] Supercritical CO2 has liquid-like density and gas-like diffusion properties, and can penetrate deep into the fibers to effectively extract harmful substances.

[0114] It effectively removes harmful chemicals and pesticide residues while protecting cellulose from being destroyed, thus improving the safety and environmental friendliness of the product.

[0115] Step 4: Precision wet grinding system

[0116] Sub-steps:

[0117] The extracted straw is fed into a water-containing mill for pulverization.

[0118] The distribution of the crushed fibers is adjusted by circulating water to ensure uniform mixing of the fibers.

[0119] The cryogenic grinding process reduces fiber damage due to heat and preserves the original properties of the fiber.

[0120] The fiber distribution is uniform, which significantly improves the quality of pulp and subsequent paper physical properties, such as tensile strength and uniformity.

[0121] Step 5: Chemical treatment at room temperature

[0122] Sub-steps:

[0123] The cut corn stover slurry is chemically treated at room temperature to improve the chemical activity and processability of the fiber.

[0124] The chemical treatment agent used is an acid or alkaline solution at room temperature, and the treatment time is 15 minutes.

[0125] Room temperature chemical treatment introduces active groups onto the fiber surface through chemical reactions, thereby increasing the chemical activity of the fiber.

[0126] The chemical activity of the fiber is improved, making subsequent chemical treatment more effective, but the effect is not as significant as low-temperature plasma treatment.

[0127] Step 6: Magnetic field assisted alkali treatment

[0128] Sub-steps:

[0129] A magnetic field is applied to assist in evenly distributing the alkaline chemical on the fibers.

[0130] The penetration depth and rate of the alkali solution are controlled by adjusting the magnetic field strength.

[0131] The magnetic field affects the arrangement and movement of alkali solution molecules, enhancing their diffusion efficiency in the fibers.

[0132] Ensure more uniform alkali treatment, effectively improve the purity and bleaching efficiency of pulp, and reduce the amount of chemical agents and production costs.

[0133] Step 7: Ozonation Bleaching

[0134] Sub-steps:

[0135] The alkali-treated slurry is reacted with ozone in a sealed environment.

[0136] Control ozone dosage and contact time to maximize bleaching effect.

[0137] Ozone is a strong oxidant that can effectively decompose pigments and residual lignin in pulp.

[0138] It can efficiently remove pigments and impurities from pulp, greatly improve the whiteness and purity of pulp, and provide an efficient solution for environmentally friendly bleaching.

[0139] Step 8: Ion exchange resin treatment

[0140] Sub-steps:

[0141] The bleached pulp is filtered through a column packed with ion exchange resin.

[0142] The resin absorbs heavy metals and inorganic impurities, purifying the pulp.

[0143] Ion exchange resins selectively exchange ions in the pulp through their functional groups to remove harmful substances.

[0144] It can effectively remove heavy metals and other inorganic impurities, further improve the purity and safety of pulp, and is suitable for the production of high-end paper.

[0145] Step 9: Ultrasonic Assisted Fiber Refinement

[0146] Sub-steps:

[0147] The treated pulp is treated in an ultrasonic device.

[0148] The frequency and power of the ultrasound waves are adjusted to optimize the physical properties of the fibers.

[0149] Ultrasonic waves generate tiny bubbles through their high-frequency vibrations, which quickly burst between fibers and thin the fibers through mechanical action.

[0150] Improve the uniformity and fineness of fibers, enhance the smoothness and uniformity of paper, while retaining more fiber length and increasing the strength of paper.

[0151] Step 10: Cooling the gel to solidify

[0152] Sub-steps:

[0153] The refined slurry is gelled under low temperature conditions.

[0154] Temperature and time are controlled to optimize the curing process.

[0155] By cooling, the water in the pulp is partially frozen, and the fibers form a stable network structure during the solidification process.

[0156] The fiber network structure of pulp is optimized, and the mechanical properties and water stability of paper are improved.

[0157] Step 11: Vacuum drying

[0158] Sub-steps:

[0159] The solidified pulp gel is vacuum dried at a temperature of 60-80° C. for 3-5 hours.

[0160] By reducing the pressure, the water can be vaporized at a lower temperature, thus reducing the damage to the fiber structure.

[0161] Ensure that the pulp is dried at low temperature to reduce thermal damage to the fibers and maintain good fiber strength and structure.

[0162] Step 12: Laser Fine Adjustment

[0163] Sub-steps:

[0164] The dried pulp is finely adjusted by laser, using laser technology to remove irregular fibers and impurities.

[0165] Laser technology can precisely remove tiny fibers and impurities, improving the uniformity of pulp.

[0166] Improve the smoothness and uniformity of finished paper, and enhance the quality and market competitiveness of paper.

[0167] Step 13: Nano silver particle spraying

[0168] Sub-steps:

[0169] The resulting pulp is then sprayed with nanosilver particles to create an antibacterial layer.

[0170] The average particle size of the nano silver particles used is 10-50 nanometers.

[0171] Nanosilver has broad-spectrum antibacterial properties and can effectively kill a variety of bacteria and microorganisms.

[0172] The paper has excellent antibacterial properties, making it suitable for medical and sanitary purposes, increasing the added value of the product and its market application scope.

[0173] The difference between Example 1 and Example 2 is that the treatment method of step 5 is different. Example 1 uses low-temperature plasma treatment technology to improve the chemical activity and processability of the fiber, making the subsequent chemical treatment more efficient and uniform. While Example 2 uses room temperature chemical treatment, although it can improve the chemical activity of the fiber, the effect is not as significant as low-temperature plasma treatment.

[0174] Embodiment three:

[0175] The embodiment of the present invention provides a novel corn straw pulp preparation process, comprising the following steps:

[0176] Step 1: Automated sorting system

[0177] Sub-steps:

[0178] The collected corn stalks are first transported to an automated sorting belt.

[0179] A high-resolution camera is used to capture images of straw, and a machine learning algorithm is used to analyze the health of the straw.

[0180] Image recognition technology can identify damaged or diseased straw through features such as color, texture and shape.

[0181] Machine learning algorithms optimize recognition accuracy based on training data and automatically filter out raw materials that do not meet standards.

[0182] This ensures that only healthy, disease-free straw is used for pulp preparation, significantly improving the quality of the final product and reducing waste.

[0183] Step 2: Adaptive cutting machine

[0184] Sub-steps:

[0185] The sorted healthy straw is cut by an adaptive cutter.

[0186] The speed and pressure of the cutting blades are automatically adjusted according to the thickness and hardness of the straw.

[0187] Adaptive technology allows the machine to adjust blade parameters in real time based on sensor feedback to cut in the most optimized way.

[0188] More uniform cutting provides ideal physical conditions for subsequent chemical treatment and fiber homogenization, helping to improve processing efficiency and pulp quality.

[0189] Step 3: Supercritical CO2 Extraction

[0190] Sub-steps:

[0191] The cut straw is contacted with supercritical CO2 in a closed reactor.

[0192] CO2 dissolves organic matter and residual pesticides in the straw under supercritical conditions.

[0193] Supercritical CO2 has liquid-like density and gas-like diffusion properties, and can penetrate deep into the fibers to effectively extract harmful substances.

[0194] It effectively removes harmful chemicals and pesticide residues while protecting cellulose from being destroyed, thus improving the safety and environmental friendliness of the product.

[0195] Step 4: Precision wet grinding system

[0196] Sub-steps:

[0197] The extracted straw is fed into a water-containing mill for pulverization.

[0198] The distribution of the crushed fibers is adjusted by circulating water to ensure uniform mixing of the fibers.

[0199] The cryogenic grinding process reduces fiber damage due to heat and preserves the original properties of the fiber.

[0200] The fiber distribution is uniform, which significantly improves the quality of pulp and subsequent paper physical properties, such as tensile strength and uniformity.

[0201] Step 5: Low temperature plasma treatment

[0202] Sub-steps:

[0203] The wet-milled slurry is exposed to a low-temperature plasma environment.

[0204] Plasma changes the surface properties of the fiber and increases its chemical activity.

[0205] Plasma can activate the fiber surface, introduce new functional groups, and enhance its reactivity with chemical treatment agents.

[0206] The chemical activity of the fiber is improved, making the subsequent chemical treatment more efficient and uniform.

[0207] Step 6: Conventional alkali treatment

[0208] Sub-steps:

[0209] The slurry is treated with a 10%-20% potassium hydroxide solution for 1-2 hours.

[0210] During the alkali treatment, the slurry is stirred regularly to ensure uniform distribution of the alkali solution.

[0211] The lye chemically dissolves the lignin and other impurities in the fiber, releasing the cellulose.

[0212] Although effective, conventional alkaline treatment is less efficient and uniform than magnetic field-assisted alkaline treatment and may require more chemicals and time.

[0213] Step 7: Ozonation Bleaching

[0214] Sub-steps:

[0215] The alkali-treated slurry is reacted with ozone in a sealed environment.

[0216] Control ozone dosage and contact time to maximize bleaching effect.

[0217] Ozone is a strong oxidant that can effectively decompose pigments and residual lignin in pulp.

[0218] It can efficiently remove pigments and impurities from pulp, greatly improve the whiteness and purity of pulp, and provide an efficient solution for environmentally friendly bleaching.

[0219] Step 8: Ion exchange resin treatment

[0220] Sub-steps:

[0221] The bleached pulp is filtered through a column packed with ion exchange resin.

[0222] The resin absorbs heavy metals and inorganic impurities, purifying the pulp.

[0223] Ion exchange resins selectively exchange ions in the pulp through their functional groups to remove harmful substances.

[0224] It can effectively remove heavy metals and other inorganic impurities, further improve the purity and safety of pulp, and is suitable for the production of high-end paper.

[0225] Step 9: Ultrasonic Assisted Fiber Refinement

[0226] Sub-steps:

[0227] The treated pulp is treated in an ultrasonic device.

[0228] The frequency and power of the ultrasound waves are adjusted to optimize the physical properties of the fibers.

[0229] Ultrasonic waves generate tiny bubbles through their high-frequency vibrations, which quickly burst between fibers and thin the fibers through mechanical action.

[0230] Improve the uniformity and fineness of fibers, enhance the smoothness and uniformity of paper, while retaining more fiber length and increasing the strength of paper.

[0231] Step 10: Cooling the gel to solidify

[0232] Sub-steps:

[0233] The refined slurry is gelled under low temperature conditions.

[0234] Temperature and time are controlled to optimize the curing process.

[0235] By cooling, the water in the pulp is partially frozen, and the fibers form a stable network structure during the solidification process.

[0236] The fiber network structure of pulp is optimized, and the mechanical properties and water stability of paper are improved.

[0237] Step 11: Vacuum drying

[0238] Sub-steps:

[0239] The solidified pulp gel is vacuum dried at a temperature of 60-80° C. for 3-5 hours.

[0240] By reducing the pressure, the water can be vaporized at a lower temperature, thus reducing the damage to the fiber structure.

[0241] Ensure that the pulp is dried at low temperature to reduce thermal damage to the fibers and maintain good fiber strength and structure.

[0242] Step 12: Laser Fine Adjustment

[0243] Sub-steps:

[0244] The dried pulp is finely adjusted by laser, using laser technology to remove irregular fibers and impurities.

[0245] Laser technology can precisely remove tiny fibers and impurities, improving the uniformity of pulp.

[0246] Improve the smoothness and uniformity of finished paper, and enhance the quality and market competitiveness of paper.

[0247] Step 13: Nano silver particle spraying

[0248] Sub-steps:

[0249] The resulting pulp is then sprayed with nanosilver particles to create an antibacterial layer.

[0250] The average particle size of the nano silver particles used is 10-50 nanometers.

[0251] Nanosilver has broad-spectrum antibacterial properties and can effectively kill a variety of bacteria and microorganisms.

[0252] The paper has excellent antibacterial properties, making it suitable for medical and sanitary purposes, increasing the added value of the product and its market application scope.

[0253] The difference between Example 3 and Example 1 is that the treatment method of step 6 is different. Example 1 adopts magnetic field assisted alkali treatment technology, which can significantly improve the efficiency and uniformity of alkali treatment and reduce the amount of chemical agents. While Example 3 adopts conventional alkali treatment, although it can achieve alkali treatment of fibers, the efficiency and uniformity are not as significant as magnetic field assisted treatment.

[0254] Table 1 Comparison table of experimental data of embodiment

[0255]

[0256]

[0257] Data Analysis:

[0258] Whiteness and purity: Example 1 has the highest whiteness and purity, mainly due to the application of low-temperature plasma treatment and magnetic field assisted alkali treatment technology, which can more effectively remove impurities and bleach pulp. Examples 2 and 3 have slightly lower whiteness and purity due to the lack of these advanced technologies.

[0259] Fiber uniformity: Example 1 has the highest fiber uniformity, and ultrasonic-assisted fiber thinning and low-temperature plasma treatment significantly improve fiber uniformity. The fiber uniformity of Example 2 and Example 3 is relatively close, but slightly inferior to that of Example 1.

[0260] Processing time: The processing time of Example 1 is the shortest, and the advanced processing technology speeds up the entire process flow. However, due to the lack of some efficient technologies, the processing time of Examples 2 and 3 is longer.

[0261] Chemical reagent dosage: Example 1 uses the least amount of chemical reagent, which is mainly due to the efficient use of magnetic field assisted alkali treatment technology. Due to the lack of this technology, Examples 2 and 3 need to use more chemical reagents to achieve similar treatment effects.

[0262] Environmental impact: Example 1 has the lowest environmental impact, and supercritical CO2 extraction and ion exchange resin treatment technology reduce the emission of harmful waste. Example 2 and Example 3 have slightly higher environmental impact, especially Example 3 due to the large amount of chemical reagents used in conventional alkali treatment.

[0263] Production cost: Example 1 has the lowest production cost, despite the introduction of a number of advanced technologies, which improve efficiency and reduce the use of chemical reagents, thereby reducing the overall cost. Examples 2 and 3 have higher costs, mainly due to the longer processing time and the larger amount of chemical reagents used.

[0264] Through the comparison of the above data, it can be seen that Example 1 performs best in various parameters, proving that its comprehensive application of advanced technologies has significant advantages in improving pulp quality and production efficiency.

[0265] Comparative Example 1:

[0266] This comparative example discloses a traditional corn straw pulp preparation process, comprising the following steps:

[0267] Step 1: Manual sorting

[0268] Sub-steps:

[0269] The collected corn stalks were manually sorted to remove the obviously diseased and damaged stalks.

[0270] Manual visual inspection and separation of diseased stalks.

[0271] The quality of raw materials is preliminarily guaranteed, but the efficiency and accuracy are low and are greatly affected by manual judgment.

[0272] Step 2: Mechanical cutting

[0273] Sub-steps:

[0274] The sorted healthy straw is cut by traditional mechanical cutters.

[0275] Cut into straw segments about 20-30 mm in length.

[0276] Mechanical cutting physically cuts with a fixed blade and speed.

[0277] Basic straw cutting was achieved, but the length was uneven, affecting subsequent processing.

[0278] Step 3: Soak in hot water

[0279] Sub-steps:

[0280] Soak the cut straw in hot water (80-90°C) for 1-2 hours to soften the straw and preliminarily remove some impurities.

[0281] Hot water softens the straw fibers through thermal action and removes surface impurities.

[0282] Initial softening of the straw facilitates subsequent chemical treatment, but the effect is limited and the energy consumption is high.

[0283] Step 4: Alkali cooking

[0284] Sub-steps:

[0285] The straw soaked in hot water is transferred to a high-temperature and high-pressure alkali boiling tank and cooked using a 10%-15% sodium hydroxide solution at a temperature of 160-180°C for 3-5 hours.

[0286] The alkali solution breaks down the lignin in the straw under high temperature and pressure, releasing cellulose.

[0287] It is effective in removing lignin, but it requires large amounts of chemical reagents, long processing time and high energy consumption.

[0288] Step 5: Bleaching

[0289] Sub-steps:

[0290] The pulp after alkali boiling is bleached using a sodium hypochlorite solution for 1-2 hours.

[0291] Sodium hypochlorite is used as a bleaching agent to oxidatively decompose pigments and residual lignin in the pulp.

[0292] Improve the whiteness of pulp, but the sodium hypochlorite residue may have adverse effects on the environment.

[0293] Step 6: Washing

[0294] Sub-steps:

[0295] The bleached pulp is washed several times to remove residual chemicals and impurities.

[0296] Water washing is the process of flushing the pulp with large amounts of clean water to remove chemical residues.

[0297] It improves the purity of pulp, but consumes a lot of water and increases the burden of wastewater treatment.

[0298] Step 7: Mechanical beating

[0299] Sub-steps:

[0300] The washed pulp is beaten by a mechanical beater for 1-2 hours.

[0301] Mechanical beating disperses the fibers through physical action and makes them uniform.

[0302] Improves fiber dispersion, but the effect is not as good as modern ultrasonic thinning technology.

[0303] Step 8: Pressing and Drying

[0304] Sub-steps:

[0305] The beaten pulp is passed through a pressing device to remove most of the moisture, and then dried in a dryer at a drying temperature of 100-120°C.

[0306] The water in the pulp is removed by mechanical pressing and hot air drying.

[0307] The pulp is dried, but high temperature drying may cause thermal damage to the fibers.

[0308] Table 2 Comparative Example Experimental Data Table

[0309] Embodiment 1 Comparative Example 1 Whiteness(%) 92 80 purity(%) 98 85 Fiber uniformity (unit) high Low Processing time (hours) 10 15 Chemical reagent dosage (kg) 5 10 Environmental impact Low high Production cost (yuan / ton) 1500 2000

[0310] Data Analysis:

[0311] Whiteness and Purity: The whiteness and purity of the conventional control were the lowest, mainly due to the lack of modern pre-treatment and bleaching technology.

[0312] Fiber uniformity: The fiber uniformity of the traditional comparison is the lowest, and the mechanical beating effect is not as good as modern technologies such as ultrasonic refinement and low-temperature plasma treatment.

[0313] Processing time: The traditional comparative example has the longest processing time, mainly due to the lack of efficient automation and chemical processing methods. The whole process requires more manual operations and longer reaction time.

[0314] Chemical reagent dosage: The traditional comparative example uses the most chemical reagents, which is inefficient and requires a large amount of chemical reagents to achieve basic treatment effects.

[0315] Environmental impact: The traditional method has the highest environmental impact, mainly due to the use of large amounts of chemical reagents and high energy consumption of hot water soaking and high temperature drying processes.

[0316] Production cost: The production cost of the conventional comparative method is the highest, mainly due to the high operating cost caused by high energy consumption and high chemical reagent usage.

[0317] In summary, Example 1 is significantly better than the conventional comparative example, not only in terms of whiteness, purity and fiber uniformity, but also in terms of processing time, amount of chemical reagents, environmental impact and production cost. This shows that modern processes using advanced technology have significant advantages in the preparation of corn straw pulp.

[0318] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel corn straw pulp preparation process, characterized in that: The following steps are involved: Step 1: Use an automated sorting system to identify and separate damaged or diseased straw parts using image recognition technology and machine learning algorithms; Step 2: The selected healthy straw is cut into uniform lengths of 5-10 mm by an adaptive cutting machine that automatically adjusts the blade speed and pressure according to the thickness and hardness of the straw; Step 3: The cut straw is passed through a closed-loop supercritical CO2 extraction system at a pressure of 120-160 bar and a temperature of 40-55°C to remove volatile organic compounds and pesticide residues and retain cellulose; Step 4: The extracted straw is ground at low temperature by a precision wet grinding system, and the fiber distribution is adjusted by water flow to form a homogeneous slurry.

2. A novel corn straw pulp preparation process according to claim 1, characterized in that: The cut straw is treated with low-temperature plasma for 15 minutes to improve the chemical activity and processability of the fiber.

3. A novel corn straw pulp preparation process according to claim 2, characterized in that: The straw after plasma treatment is subjected to alkali treatment assisted by a magnetic field, using a 10%-20% potassium hydroxide solution and a magnetic field strength of 500-1000 Gauss.

4. A novel corn straw pulp preparation process according to claim 3, characterized in that: The alkali treated pulp is subjected to ozone bleaching, with an ozone dosage of 0.5%-1.5% and a bleaching time of 15-30 minutes.

5. A novel corn straw pulp preparation process according to claim 4, characterized in that: The bleached pulp is treated with ion exchange resin to remove heavy metals and other inorganic impurities and improve the purity and whiteness of the pulp.

6. A novel corn straw pulp preparation process according to claim 1, characterized in that: The treated pulp is subjected to ultrasonic-assisted fiber refinement using an ultrasonic frequency of 40-60 kHz for a duration of 20-40 minutes.

7. A novel corn straw pulp preparation process according to claim 6, characterized in that: The refined pulp is solidified by cooling gel technology, the solidification temperature is -10 to 0°C, and the solidification time is 1 to 2 hours.

8. A novel corn straw pulp preparation process according to claim 7, characterized in that: The solidified pulp gel is vacuum dried at a temperature of 60-80° C. for 3-5 hours.

9. The novel corn straw pulp preparation process according to claim 1, characterized in that: The dried pulp is finely adjusted by laser to improve the smoothness and uniformity of the finished paper.

10. A novel corn straw pulp preparation process according to claim 9, characterized in that: The obtained pulp is sprayed with nano silver particles to form an antibacterial layer for use in the production of medical and sanitary paper. The average particle size of the nano silver particles is 10-50 nanometers.

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