A process for treating raw material fibers used in Xuan paper production

Abstract

This invention provides a fiber processing technology for Xuan paper production, belonging to the field of Xuan paper production technology. The process involves steaming and boiling the bark of *Pterocarya stenoptera* and rice straw used in Xuan paper production to break down the lignin within the bark and straw, turning them into fibers. The fibers are then pulverized using a fiber cutting device to increase their surface area in contact with water. The pulverized fibers are mixed with water and passed through a rolling sieve to remove impurities from both the fibers and the water. The sieved mixture is then photobleached. The bleached mixture is further dried under vacuum to remove moisture. The dried mixture is then finely ground using a ball mill. Finally, the finely ground mixture is filtered. This process solves the problems of unstable impurity screening and grinding fineness in existing fiber processing methods, which makes it difficult to guarantee the quality of subsequent Xuan paper production and results in low fiber processing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of Xuan paper production technology, and more specifically, relates to a raw material fiber processing technology for Xuan paper production. Background Technology

[0002] Xuan paper, as one of China's traditional handicrafts, boasts a long history and rich cultural connotations. The main raw material for Xuan paper is the bark of the Qingtan tree. Through multiple processes including peeling, cutting, soaking, steaming, rinsing, and drying, Xuan paper is finally formed. The production process of Xuan paper is specifically divided into three stages: raw material processing, pulping, and papermaking. First, the raw material processing stage mainly includes peeling and cutting. After the bark of the Qingtan tree is peeled off, it is cut into fine fibers. This process requires ensuring the integrity of the bark and the uniformity of the fibers. Next is the pulping stage, which mainly includes soaking, steaming, and rinsing. After soaking, the Qingtan bark needs to be steamed to soften the fibers, and then rinsed to remove impurities and make the fibers purer. The purpose of this stage is to ensure the quality of the paper. Finally, the papermaking stage is the most crucial and also the most difficult part of making Xuan paper. Papermaking requires stirring, screening, flattening, rolling, and pressing the pulped fibers to finally form Xuan paper. This process requires artisans to rely on their rich experience and skills to make the Xuan paper have a uniform texture and clear patterns.

[0003] Fiber treatment is a crucial step, directly impacting the quality, strength, and durability of Xuan paper. Fiber treatment involves physical and chemical processes to treat the fibers in the raw materials, bringing them to specific quality and performance requirements, thereby improving the quality of the Xuan paper. During fiber treatment, methods such as screening, bleaching, softening, stretching, and hot pressing are used to remove impurities, lignin, pectin, and other components from the fibers, making them purer, softer, and smoother. This improves the smoothness and texture of the Xuan paper, enhancing its aesthetic appeal. Fiber treatment, through stretching and hot pressing, makes the fiber molecular structure more compact, thus increasing the strength and durability of the Xuan paper. Furthermore, fiber treatment can alter the surface properties of the fibers, making them smoother and softer, thereby improving the tensile strength and tear resistance of the Xuan paper. Fiber treatment makes the fibers softer and smoother, improving the adaptability of the Xuan paper. For example, in high-temperature and high-humidity environments, fiber treatment makes the fibers softer, reducing friction between fibers and improving the durability of the Xuan paper. During fiber processing, impurities and lignin can be removed from the fibers through methods such as screening and bleaching, reducing environmental pollution. Furthermore, fiber processing can also reduce the environmental impact of Xuan paper production through recycling and reuse.

[0004] The existing fiber processing methods are unstable in terms of impurity screening and grinding fineness, making it difficult to guarantee the quality of subsequent Xuan paper production, resulting in low fiber processing efficiency. Summary of the Invention

[0005] In view of this, the present invention provides a raw material fiber processing technology for Xuan paper production, which can solve the problems of unstable screening and grinding of impurities in existing fiber processing processes, making it difficult to guarantee the quality of subsequent Xuan paper production and resulting in low fiber processing efficiency.

[0006] This invention is implemented as follows:

[0007] This invention provides a process for treating raw material fibers used in Xuan paper production, comprising the following steps:

[0008] S10: Steaming the bark of the Qingtan tree and the Shatian rice straw used in Xuan paper production to break down the lignin inside the bark and the Shatian rice straw into fibers.

[0009] S20: The fiber is pulverized by a fiber cutting device to increase the surface area of ​​the fiber in contact with water;

[0010] S30: Mix the pulverized fiber with water and stir continuously to ensure that the pulverized fiber and water are in full contact;

[0011] S40: The impurities in the crushed fiber and water are removed by a rolling sieve device, and the mixture of crushed fiber and water is screened.

[0012] S50: The screened mixture is photobleached to remove pigments and impurities from the bark of the Chinese tallow tree and the straw of the sandy field.

[0013] S60: Remove moisture from the bleached mixture by vacuum drying to achieve rapid dehydration of the mixture;

[0014] S70: The dried mixture is finely ground using a ball mill to increase the fineness of the mixture;

[0015] S80: Filter the finely ground mixture to remove solid impurities from the mixture;

[0016] S90: The filtered mixture is mixed with water to form pulp, which is used for the production of Xuan paper.

[0017] The specific steps for finely grinding the dried mixture using a ball mill to increase its fineness include:

[0018] The first step is to feed the dried mixture into a ball mill for coarse grinding;

[0019] The second step is to feed the coarsely ground mixture back into the ball mill, add a certain amount of water to make the mixture wet but not waterlogged, and then perform wet fine grinding through the ball mill.

[0020] The third step is to place the mixture in the sun to dry quickly after ball milling.

[0021] The specific steps of filtering the finely ground mixture to remove solid impurities include:

[0022] The finely ground mixture is placed into a sieving device, and a mixture storage device is placed at the bottom of the sieving device. The mixture is continuously sieved by the sieving device to remove solid impurities. The filtered mixture is then stored in the mixture storage device.

[0023] Based on the above technical solution, the raw material fiber processing technology for Xuan paper production of the present invention can be further improved as follows:

[0024] The specific steps involved in steaming and boiling the bark of *Pterocarya stenoptera* and rice straw used in Xuan paper production to break down the lignin inside the bark and straw and turn them into fibers include:

[0025] The first step is to classify, screen, and process the bark of the Qingtan tree and the Shatian rice straw to remove impurities and dirt;

[0026] The second step is to mix the alkaline agent with water evenly to prepare an alkaline agent with a concentration between 5% and 10%.

[0027] The third step is to pile the bark of the Chinese sandalwood (after removing impurities and dirt) and the rice straw of the sandy field in a 3:1 ratio, with a pile height of 20-30 cm, to ensure the uniform distribution of the bark and the rice straw.

[0028] The fourth step is to lay a 10cm thick straw mat on the piled-up bark of the sandalwood tree and the straw of the sandy field.

[0029] Fifth step: Light a fire on the straw mat. When the temperature reaches 60-70℃, pour the alkaline agent evenly into the piled-up bark of the Chinese privet and the rice straw, so that the alkaline agent completely covers the bark of the Chinese privet and the rice straw.

[0030] Step 6: Turn the bark of the Qingtan tree and the Shatian straw over during the 30-40 minute intervals of steaming to ensure even heating.

[0031] Step 7: During the steaming and filtering process, an alkaline agent is continuously added to the bark of the Chinese sandalwood tree and the rice straw from the sandy field to ensure that the bark of the Chinese sandalwood tree and the rice straw from the sandy field are fully softened;

[0032] Step 8: After the bark of the Qingtan tree and the Shatian rice straw have been steamed and softened, extinguish the fire source and stop steaming.

[0033] Step 9: After the steamed and boiled bark of the sandalwood tree and the sandy rice straw have cooled to room temperature, remove the straw mat.

[0034] Furthermore, the specific steps of pulverizing the fibers using a fiber cutting device to increase the surface area of ​​the fibers in contact with water include:

[0035] The first step is to place the fiber in the fiber cutting device such that the length direction of the fiber is at 90° with the direction of the cutting blade of the fiber cutting device;

[0036] The second step is to secure the fibers every 8-10 cm with cable ties;

[0037] The third step involves moving the fiber continuously from one side to the other, and cutting the fiber into 1-2 cm segments using the cutting blade of the fiber cutting device.

[0038] Fourth step: When the cutting blade moves near the cable tie, quickly remove the cable tie;

[0039] The fifth step is to collect the pulverized fibers together for easier subsequent processing.

[0040] Furthermore, the specific steps of mixing the pulverized fibers with water and continuously stirring to ensure sufficient contact between the pulverized fibers and water include:

[0041] The first step is to pour the pulverized fiber into a magnetic stirring tank and add water at a ratio of 5 times the weight of the fiber to water, so that the ratio of fiber to water is 1:5.

[0042] The second step is to seal the fixed cover of the magnetic stirring tank to the stirring tank.

[0043] The third step involves thoroughly stirring the mixture of pulverized fiber and water using a magnetic stirring tank, ensuring that the pulverized fiber is evenly distributed in the water and that the pulverized fiber and water are in full contact.

[0044] The magnetic stirring tank is a magnetic stirring device, which includes a stirring plate, a magnetic system, and stirring shafts. The stirring plate is fixed to the bottom of the stirring shell, and multiple stirring shafts are respectively set on the top of the stirring plate for stirring the mixture inside the magnetic stirring device. The magnetic system is fixed to the bottom of the stirring plate and is used to control the rotation of the stirring shafts. The stirring plate is a magnetic plate, and the magnetic system is an AC magnetizer, which is used to generate an AC magnetic field at the bottom of the stirring plate.

[0045] Furthermore, the specific steps for removing impurities from the pulverized fiber and water using a rolling sieve device, and for screening the mixture of pulverized fiber and water, include:

[0046] The first step is to fix a circular sieve with a sieve hole diameter of 1cm onto the side wall of the rolling sieve device;

[0047] The second step is to pour all the crushed fiber and water into the rolling sieve device;

[0048] The third step is to start the rolling sieve device and make its rotation speed 100-150 rpm;

[0049] Fourth step: Clean the impurities sieved out by the rolling sieve device every 30 minutes;

[0050] The fifth step is to complete the screening of the pulverized fiber and water mixture when the impurities at the sieve are less than 10g within 30 minutes using the rolling sieve device.

[0051] Furthermore, the specific steps of photobleaching the screened mixture to remove pigments and impurities from the bark of *Pterocarya stenoptera* and rice straw include:

[0052] The first step is to add water back into the screened fibers so that the ratio of fibers to water is 1:5;

[0053] The second step is to add hydrogen peroxide and catalyst to the mixture at a ratio of 1:25, and stir evenly to form a pre-bleaching slurry.

[0054] The third step is to put the pre-bleaching slurry into a photobleaching device and irradiate it with ultraviolet light to stimulate the decomposition of hydrogen peroxide to produce oxygen. The oxygen is further decomposed under the action of a catalyst to produce free radicals, thereby decomposing the organic matter in the fiber.

[0055] The fourth step is to control the pH value of the photobleaching process between 3 and 6, and to control the bleaching time to 1-2 hours.

[0056] The fifth step involves continuously washing the slurry after bleaching to remove hydrogen peroxide and catalyst from it.

[0057] The specific steps for removing moisture from the bleached mixture by vacuum drying to achieve rapid dehydration of the mixture include:

[0058] The first step is to evenly distribute the bleached mixture within the working area of ​​the vacuum dryer;

[0059] The second step is to turn on the vacuum dryer's suction function to quickly evaporate the moisture in the mixture;

[0060] The third step is to monitor the pressure changes inside the vacuum dryer and ensure that the pressure reaches the set value.

[0061] The fourth step is to completely remove the moisture using the residual pressure inside the vacuum dryer.

[0062] Fifth step: Once all moisture has been removed, turn off the vacuum dryer.

[0063] The specific steps for controlling the pH value of photobleaching between 3 and 6 include:

[0064] The first step is to take a sample of the slurry every 20 minutes during the photobleaching process and monitor the pH value of the slurry using a pH meter;

[0065] The second step is to add low-concentration sulfuric acid to the slurry when the pH value is higher than 6, and to add calcium hydroxide to the slurry when the pH value is lower than 3.

[0066] The catalyst is one of sulfate, ozone, or catalase, used to accelerate the photobleaching reaction rate.

[0067] Furthermore, the rolling sieving device includes a screen, a drum, a sieving chamber, a transmission device, and a protective cover. The screen and the sieving chamber are cylindrical. The drum is fixed to the bottom of the sieving chamber. The screen is located inside the drum and is movably connected to the drum. The drum and the sieving chamber are arranged concentrically. The middle position of the drum is fixedly connected to the output end of the transmission device. The transmission device is used to drive the rolling sieving device to rotate. The protective cover is fixed to the outermost side of the rolling sieving device and is used to protect the rolling sieving device.

[0068] Furthermore, the roller includes a frame, a support frame, and a connecting mechanism. The frame is disposed inside the screening chamber, the connecting mechanism is arranged concentrically with the frame, and the support frame is fixed between the frame and the connecting mechanism.

[0069] The frame has an inwardly curved fixing groove at its edge, and the fixing groove has an S-shaped cross-section. The screen is pressed into the fixing groove by a fixing ring.

[0070] The size of the fixing ring is smaller than the diameter of the frame. The fixing ring is made of rubber, and its cross-sectional diameter is the same as the minimum lateral dimension of the cross-section of the fixing groove.

[0071] The fixed ring has a protrusion at the point where it presses against the side wall of the frame, and the protrusion has a size of 0.5 mm.

[0072] Furthermore, the transmission device includes a forward rotating motor and a reverse rotating motor, which are fixed on the left and right sides of the connecting mechanism to drive the rolling screen device to rotate continuously and alternately, thereby reducing the torque force of the rolling screen device.

[0073] Furthermore, the diameter of the screening chamber is 10 cm larger than the diameter of the frame, and it is used to store the material sieved through the screen.

[0074] Compared with existing technologies, the beneficial effects of the raw material fiber processing technology for Xuan paper production provided by this invention are as follows: By steaming and boiling the bark of *Pterocarya stenoptera* and rice straw used in Xuan paper production, the lignin inside the bark and straw is destroyed and transformed into fibers; the fibers are pulverized using a fiber cutting device to increase the surface area of ​​the fibers in contact with water; the pulverized fibers are mixed with water and continuously stirred to ensure full contact between the fibers and water; impurities in the pulverized fibers and water are removed using a rolling sieve device, and the mixture of pulverized fibers and water is screened; the screened mixture is then light-bleached to remove impurities. This process removes pigments and impurities from the bark of *Pterocarya stenoptera* and rice straw from the mixture. It achieves rapid dehydration of the bleached mixture by vacuum drying. The dried mixture is then finely ground using a ball mill to increase its fineness. Solid impurities are removed by filtering the finely ground mixture. Water is added to the filtered mixture to form pulp for use in Xuan paper production. This raw material fiber treatment process for Xuan paper production solves the problems of unstable impurity screening and grinding fineness in existing fiber treatment processes, which makes it difficult to guarantee the quality of subsequent Xuan paper production and results in low fiber treatment efficiency. Attached Figure Description

[0075] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0076] Figure 1This is an operation flow chart of a raw material fiber processing technology for Xuan paper production.

[0077] Figure 2 This is a schematic diagram of the rotating sieve device.

[0078] Figure 3 This is a schematic diagram of the top cross-sectional structure of the rotary sieve device;

[0079] Figure 4 This is a schematic diagram of the cross-sectional structure of the fixing ring and the fixing groove;

[0080] Figure 5 This is a schematic diagram of the structure of a magnetic stirring tank;

[0081] The attached diagram lists the components represented by each number as follows:

[0082] 10. Magnetic stirring device; 11. Stirring pan; 12. Magnetic system; 13. Stirring shaft; 20. Screen; 30. Drum; 31. Frame; 32. Support frame; 33. Connecting mechanism; 40. Screening chamber; 50. Transmission device; 51. Forward rotation motor; 52. Reverse rotation motor; 60. Protective cover. Detailed Implementation

[0083] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0084] like Figure 1 The diagram shows an operation flow chart of a raw material fiber processing technology for Xuan paper production provided by the present invention. The process includes the following steps:

[0085] S10: The bark of the Qingtan tree and the rice straw used in Xuan paper production are steamed to break down the lignin inside the bark and the rice straw and turn them into fibers.

[0086] S20: The fiber is crushed by a fiber cutting device to increase the surface area of ​​the fiber in contact with water;

[0087] S30: Mix the pulverized fiber with water and stir continuously to ensure that the pulverized fiber and water are in full contact;

[0088] S40: The impurities in the crushed fiber and water are removed by a rolling sieve device, and the mixture of crushed fiber and water is screened.

[0089] S50: The screened mixture is photobleached to remove pigments and impurities from the bark of the Chinese tallow tree and the straw of the sandy field.

[0090] S60: Removes moisture from the bleached mixture by vacuum drying to achieve rapid dehydration of the mixture;

[0091] S70: The dried mixture is finely ground using a ball mill to increase the fineness of the mixture;

[0092] S80: Filter the finely ground mixture to remove solid impurities from the mixture;

[0093] S90: The filtered mixture is mixed with water to form pulp, which is used for the production of Xuan paper.

[0094] The specific steps for increasing the fineness of the dried mixture by fine grinding in a ball mill include:

[0095] The first step is to feed the dried mixture into a ball mill for coarse grinding;

[0096] The second step is to feed the coarsely ground mixture back into the ball mill, add a certain amount of water to make the mixture wet but not water-laden, and then perform wet fine grinding through the ball mill.

[0097] The third step is to place the mixture in the sun to dry quickly after ball milling.

[0098] The specific steps for filtering the finely ground mixture to remove solid impurities include:

[0099] The finely ground mixture is placed into a rotary sieve device, and a mixture storage device is placed at the bottom of the rotary sieve device. The mixture is continuously sieved by the rotary sieve device to remove solid impurities from the mixture, and the filtered mixture is stored in the mixture storage device.

[0100] In the aforementioned technical solution, the specific steps involved in steaming and boiling the bark of the *Pterocarya stenoptera* tree and the rice straw used in Xuan paper production to break down the lignin inside the bark and straw and turn them into fibers include:

[0101] The first step is to classify, screen, and process the bark of the Qingtan tree and the rice straw from Shatian to remove impurities and dirt;

[0102] The second step is to mix the alkaline agent with water evenly to prepare an alkaline agent with a concentration between 5% and 10%.

[0103] The third step is to pile up the bark of the Chinese sandalwood tree (after removing impurities and dirt) and the rice straw of Shatian in a 3:1 ratio, with a pile height of 20-30 centimeters, to ensure the even distribution of the bark and the rice straw.

[0104] The fourth step is to lay a 10cm thick straw mat on the piled-up bark of the sandalwood tree and the straw of the sandy field.

[0105] The fifth step is to light a fire on the straw mat. When the temperature reaches 60-70℃, pour the alkaline agent evenly into the pile of Qingtan bark and Shatian straw, so that the alkaline agent completely covers the Qingtan bark and Shatian straw.

[0106] Step 6: Turn the bark of the sandalwood tree and the straw of the sandalwood tree every 30-40 minutes to ensure even heating.

[0107] The seventh step involves continuously adding alkaline agents to the bark of the Chinese sandalwood tree and the rice straw during the steaming and filtering process to ensure that the bark and rice straw are fully softened.

[0108] Step 8: Once the bark of the Qingtan tree and the Shatian rice straw have been steamed and softened, extinguish the fire and stop steaming.

[0109] Step nine: After the steamed and boiled bark of the sandalwood tree and the rice straw of Shatian have cooled to room temperature, remove the straw mat.

[0110] Furthermore, in the above technical solution, the specific steps of pulverizing the fibers using a fiber cutting device to increase the surface area of ​​the fibers in contact with water include:

[0111] The first step is to place the fiber in the fiber cutting device so that the length direction of the fiber is at 90° with the direction of the cutting blade of the fiber cutting device;

[0112] The second step is to secure the fibers every 8-10cm with cable ties;

[0113] The third step involves moving the fiber continuously from one side to the other, using the cutting blade of the fiber cutting device to cut the fiber into 1-2cm segments.

[0114] Fourth step: Quickly remove the cable tie when the cutting blade is near it;

[0115] The fifth step is to collect the shredded fibers together for easier subsequent processing.

[0116] Furthermore, in the above technical solution, the specific steps of mixing the pulverized fibers with water and continuously stirring to ensure full contact between the pulverized fibers and water include:

[0117] The first step is to pour the pulverized fiber into a magnetic stirring container and add water at a ratio of 5 times the weight of the fiber to 5 times the weight of the fiber to make the ratio of fiber to water 1:5.

[0118] The second step is to seal the cap of the magnetic stirring tank to the stirring tank.

[0119] The third step involves thoroughly stirring the mixture of pulverized fiber and water using a magnetic stirring tank, ensuring that the pulverized fiber is evenly distributed in the water and that the pulverized fiber and water come into full contact.

[0120] like Figure 5 The figure shows a schematic diagram of the structure of the magnetic stirring tank provided by the present invention. In the figure, the magnetic stirring tank is a magnetic stirring device 10. The magnetic stirring device 10 includes a stirring plate 11, a magnetic system 12, and stirring shafts 13. The stirring plate 11 is fixed to the bottom of the stirring shell. There are multiple stirring shafts 13, which are respectively set on the top of the stirring plate 11 for stirring the mixture inside the magnetic stirring device 10. The magnetic system 12 is fixed to the bottom of the stirring plate 11 for controlling the rotation of the stirring shafts 13. The stirring plate 11 is a magnetic plate, and the magnetic system 12 is an AC magnetizer. The AC magnetizer is used to generate an AC magnetic field at the bottom of the stirring plate 11.

[0121] Furthermore, in the above technical solution, the specific steps for screening the mixture of pulverized fiber and water by removing impurities from the pulverized fiber and water using a rolling sieve device include:

[0122] The first step is to fix a circular sieve with a sieve hole diameter of 1cm onto the side wall of the rolling sieve device;

[0123] The second step is to pour all the crushed fiber and water into the rotating sieve device;

[0124] The third step is to start the rolling sieve device and set its rotation speed to 100-150 rpm;

[0125] The fourth step is to clean the impurities sieved out by the rotating sieve device every 30 minutes.

[0126] The fifth step is to complete the screening of the pulverized fiber and water mixture when the impurities at the sieve are less than 10g within 30 minutes using the rolling sieve device.

[0127] Furthermore, in the above technical solution, the specific steps of photobleaching the screened mixture to remove pigments and impurities from the bark of *Pterocarya stenoptera* and rice straw include:

[0128] The first step is to add water back into the screened fibers so that the ratio of fiber to water is 1:5.

[0129] The second step is to add hydrogen peroxide and catalyst to the mixture at a ratio of 1:25, and stir evenly to form a pre-bleaching slurry.

[0130] The third step is to put the pre-bleached pulp into a photobleaching device. By irradiating it with ultraviolet light, hydrogen peroxide is activated to decompose and produce oxygen. The oxygen is further decomposed under the action of a catalyst to produce free radicals, which decomposes the organic matter in the fiber.

[0131] The fourth step is to control the pH value of the photobleaching process between 3 and 6, and to control the bleaching time to 1-2 hours.

[0132] The fifth step is to continuously wash the slurry after bleaching to remove hydrogen peroxide and catalyst from it.

[0133] The bleached mixture is dried by vacuum drying to remove moisture. The specific steps for achieving rapid dehydration of the mixture include:

[0134] The first step is to evenly distribute the bleached mixture within the working area of ​​the vacuum dryer;

[0135] The second step is to turn on the vacuum dryer's suction function to quickly evaporate the moisture in the mixture;

[0136] The third step is to monitor the pressure changes inside the vacuum dryer and ensure that the pressure reaches the set value.

[0137] The fourth step is to completely remove the moisture using the residual pressure inside the vacuum dryer.

[0138] Fifth step: Once all moisture has been removed, turn off the vacuum dryer.

[0139] The specific steps for controlling the pH value of photobleaching between 3 and 6 include:

[0140] The first step is to take a sample of the slurry every 20 minutes during the photobleaching process and monitor the pH value of the slurry using a pH meter;

[0141] The second step is to add low-concentration sulfuric acid to the slurry when the pH value is higher than 6, and to add calcium hydroxide to the slurry when the pH value is lower than 3.

[0142] The catalyst is one of sulfate, ozone, or catalase, used to accelerate the photobleaching reaction rate.

[0143] Furthermore, in the above technical solutions, such as Figure 2-4 The figure shows a schematic diagram of the rolling sieving device provided by the present invention. In the figure, the rolling sieving device includes a screen 20, a drum 30, a screening chamber 40, a transmission device 50, and a protective cover 60. The screen 20 and the screening chamber 40 are cylindrical. The drum 30 is fixed at the bottom of the screening chamber 40. The screen 20 is located inside the drum 30 and is movably connected to the drum 30. The drum 30 and the screening chamber 40 are arranged concentrically. The middle position of the drum 30 is fixedly connected to the output end of the transmission device 50. The transmission device 50 is used to drive the rolling sieving device to rotate. The protective cover 60 is fixed on the outermost side of the rolling sieving device and is used to protect the rolling sieving device.

[0144] Furthermore, in the above technical solution, the roller 30 includes a frame 31, a support frame 32, and a connecting mechanism 33. The frame 31 is disposed inside the screening chamber 40, the connecting mechanism 33 is arranged concentrically with the frame 31, and the support frame 32 is fixed between the frame 31 and the connecting mechanism 33.

[0145] The frame 31 has an inwardly curved fixing groove at its edge. The fixing groove has an S-shaped cross-section. The screen 20 is pressed into the fixing groove by a fixing ring.

[0146] The size of the retaining ring is smaller than the diameter of frame 31. The retaining ring is made of rubber, and its cross-sectional diameter is the same as the minimum transverse dimension of the cross-section of the retaining groove.

[0147] The surface of the fixing ring is provided with a protrusion at the position where it is pressed against the side wall of the frame 31. The protrusion has a size of 0.5mm.

[0148] In use, place the screens 20 with different screen hole diameters on the frame 31, align the fixing ring with the fixing groove, and press down to fix the screens 20 inside the frame 31.

[0149] Furthermore, in the above technical solution, the transmission device 50 includes a forward rotating motor 51 and a reverse rotating motor 52, which are fixed on the left and right sides of the connecting mechanism 33 to drive the rolling screen device to rotate continuously and alternately, thereby reducing the torque force of the rolling screen device rotation.

[0150] In use, the forward rotating motor 51 and the reverse rotating motor 52 alternately drive the drum 30 to rotate, and the material is screened through the screen 20.

[0151] Furthermore, in the above technical solution, the diameter of the screening chamber 40 is 10cm larger than the diameter of the frame 31, and it is used to store the material screened out by the screen 20.

[0152] Example 1:

[0153] The bark of *Pterocarya stenoptera* and the rice straw from Shatin were sorted, screened, and processed to remove impurities and dirt. An alkaline agent was mixed evenly with water to prepare a 5% alkaline solution. The bark and rice straw, after removing impurities and dirt, were piled in a 3:1 ratio to a height of 20 cm, ensuring even distribution. A 10cm thick straw mat was laid on top of the pile. A fire was lit on the straw mat, and when the temperature reached 60℃, the alkaline solution was applied. Evenly pour the alkaline agent into the piled-up *Pterocarya stenoptera* bark and *Sataysia japonica* straw, ensuring complete coverage. Turn the bark and straw during the 30-minute steaming intervals to ensure even heating. Continuously add the alkaline agent during steaming and filtering to fully soften the bark and straw. Once both bark and straw are softened, extinguish the fire and stop steaming. Remove the straw mat after it has cooled to room temperature. Place the fibers in a fiber cutting device, aligning the fiber length with the cutting blade at a 90° angle. Secure the fibers every 8cm with cable ties. Move the fiber from one side to the other, cutting it into 1cm segments using the cutting blade. Quickly remove the cable ties when the blade approaches them. Collect the shredded fibers for further processing. Mix the pulverized fiber with water and stir continuously to ensure full contact between the fiber and water. Fix a circular sieve with a 1cm diameter mesh onto the side wall of the shredding device. Pour all the pulverized fiber and water into the shredding device. Start the shredding device and rotate it to 100 rpm. Clean the impurities that pass through the shredding device every 30 minutes. When the impurities at the sieve are less than 10g within 30 minutes, the sieving of the mixture of pulverized fiber and water is complete. Water is added back to the screened fibers to achieve a fiber-to-water ratio of 1:5. Hydrogen peroxide and a catalyst are added to the mixture at a ratio of 1:25, and stirred thoroughly to form a pre-bleaching pulp. The pre-bleaching pulp is placed in a photobleaching device, where ultraviolet light irradiates it to stimulate the decomposition of hydrogen peroxide, producing oxygen. The oxygen further decomposes under the action of the catalyst, generating free radicals, which decompose the organic matter in the fibers. The pH value of the photobleaching is controlled at 3, and the bleaching time is controlled at 1 hour. After bleaching, the pulp is continuously washed to remove hydrogen peroxide and the catalyst. The bleached mixture is then dried under vacuum to remove moisture, achieving rapid dehydration. The dried mixture is then finely ground using a ball mill to increase its fineness. The finely ground mixture is then filtered to remove solid impurities. Water is added to the filtered mixture to form pulp for the production of Xuan paper.

[0154] Example 2:

[0155] The bark of *Pterocarya stenoptera* and the straw of *Solanum lyratum* were classified, screened, and processed. An alkaline agent was mixed evenly with water to prepare a 10% alkaline solution. The *Pterocarya stenoptera* bark and *Solanum lyratum* straw, after removing impurities and dirt, were piled in a 3:1 ratio to a height of 30 cm. A 10 cm thick straw mat was laid on top of the pile. A fire was lit on the straw mat, and when the temperature reached 70°C, the alkaline solution was poured evenly into the pile of *Pterocarya stenoptera* bark and *Solanum lyratum* straw. The *Pterocarya stenoptera* bark and *Solanum lyratum* straw were turned over every 40 minutes of steaming. The alkaline solution was continuously added to the *Pterocarya stenoptera* bark and *Solanum lyratum* straw during the steaming and filtering process. Once the *Pterocarya stenoptera* bark and *Solanum lyratum* straw had softened from the steaming, the fire was extinguished, and the steaming was stopped. The straw mat was removed after the steamed *Pterocarya stenoptera* bark and *Solanum lyratum* straw had cooled to room temperature. Place the fiber in the fiber cutting device so that the length direction of the fiber is at a 90° angle to the cutting blade of the fiber cutting device; secure the fiber every 10cm with cable ties; move the fiber continuously from one side to the other, cutting it into 2cm segments by the cutting blade of the fiber cutting device; mix the crushed fiber with water, stirring continuously to ensure full contact between the crushed fiber and water; fix a sieve with a 1cm diameter mesh on the side wall of the tumbling sieve device; pour all the crushed fiber and water into the tumbling sieve device; start the tumbling sieve device, rotating it at 150rpm; clean the impurities sieved through the tumbling sieve device every 30 minutes; when the impurities sieved through the tumbling sieve device within 30 minutes are less than 10g, the screening of the mixture of crushed fiber and water is complete. Water is added back to the screened fibers to achieve a fiber-to-water ratio of 1:5. Hydrogen peroxide and a catalyst are added to the mixture at a ratio of 1:25, and stirred until homogeneous to form a pre-bleaching pulp. The pre-bleaching pulp is then placed in a photobleaching device and irradiated with ultraviolet light to decompose the organic matter in the fibers. The pH value of the photobleaching is controlled at 6, and the bleaching time is controlled at 2 hours. The pulp is continuously washed after bleaching. The bleached mixture is then dried under vacuum to remove moisture. The dried mixture is then finely ground using a ball mill. The finely ground mixture is then filtered. Water is added to the filtered mixture to form pulp for the production of Xuan paper.

[0156] Specifically, the principle of this invention is as follows: The bark of *Pterocarya stenoptera* and rice straw used in Xuan paper production are steamed to break down the lignin inside the bark and straw, turning them into fibers. The fibers are then pulverized using a fiber cutting device to increase the surface area of ​​the fibers in contact with water. The pulverized fibers are mixed with water and continuously stirred. Impurities in the pulverized fibers and water are removed using a rolling sieve device, and the mixture is then screened. The screened mixture is then photobleached. The bleached mixture is then dried using a vacuum dryer to remove moisture. The dried mixture is then finely ground using a ball mill. The finely ground mixture is then filtered. Finally, water is added to the filtered mixture to form pulp.

Claims

1. A process for treating raw material fibers used in Xuan paper production, characterized in that, Includes the following steps: S10: Steaming the bark of the Qingtan tree and the Shatian rice straw used in Xuan paper production to break down the lignin inside the bark and the Shatian rice straw into fibers. S20: The fiber is pulverized by a fiber cutting device to increase the surface area of ​​the fiber in contact with water; S30: Mix the pulverized fiber with water and stir continuously to ensure that the pulverized fiber and water are in full contact; S40: The impurities in the crushed fiber and water are removed by a rolling sieve device, and the mixture of crushed fiber and water is screened. S50: The screened mixture is photobleached to remove pigments and impurities from the bark of the Chinese tallow tree and the straw of the sandy field. S60: Remove moisture from the bleached mixture by vacuum drying to achieve rapid dehydration of the mixture; S70: The dried mixture is finely ground using a ball mill to increase the fineness of the mixture; S80: Filter the finely ground mixture to remove solid impurities from the mixture; S90: The filtered mixture is mixed with water to form pulp, which is used in the production of Xuan paper; The specific steps of steaming and boiling the bark of *Pterocarya stenoptera* and rice straw used in Xuan paper production to break down the lignin inside the bark and straw into fibers include: The first step is to classify, screen, and process the bark of the Qingtan tree and the Shatian rice straw to remove impurities and dirt; The second step is to mix the alkaline agent with water evenly to prepare an alkaline agent with a concentration between 5% and 10%. The third step is to pile the bark of the Chinese sandalwood (after removing impurities and dirt) and the rice straw of the sandy field in a 3:1 ratio, with a pile height of 20-30 cm, to ensure the uniform distribution of the bark and the rice straw. The fourth step is to lay a 10cm thick straw mat on the piled-up bark of the sandalwood tree and the straw of the sandy field. Fifth step: Light a fire on the straw mat. When the temperature reaches 60-70℃, pour the alkaline agent evenly into the piled-up bark of the Chinese privet and the rice straw, so that the alkaline agent completely covers the bark of the Chinese privet and the rice straw. Step 6: Turn the bark of the Qingtan tree and the Shatian straw over during the 30-40 minute intervals of steaming to ensure even heating. Step 7: During the steaming and filtering process, an alkaline agent is continuously added to the bark of the Chinese sandalwood tree and the rice straw from the sandy field to ensure that the bark of the Chinese sandalwood tree and the rice straw from the sandy field are fully softened; Step 8: After the bark of the Qingtan tree and the Shatian rice straw have been steamed and softened, extinguish the fire source and stop steaming. Step 9: After the steamed and boiled bark of the sandalwood tree and the rice straw of the sandy field have cooled to room temperature, remove the straw mat. The specific steps of pulverizing the fibers using a fiber cutting device to increase the surface area of ​​the fibers in contact with water include: The first step is to place the fiber in the fiber cutting device such that the length direction of the fiber is at 90° with the direction of the cutting blade of the fiber cutting device; The second step is to secure the fibers every 8-10 cm with cable ties; The third step involves moving the fiber continuously from one side to the other, and cutting the fiber into 1-2 cm segments using the cutting blade of the fiber cutting device. Fourth step: When the cutting blade moves near the cable tie, quickly remove the cable tie; The fifth step is to collect the pulverized fibers together for easier subsequent processing; The specific steps for photobleaching the screened mixture to remove pigments and impurities from the bark of *Pterocarya stenoptera* and rice straw include: The first step is to add water back into the screened fibers so that the ratio of fibers to water is 1:5; The second step is to add hydrogen peroxide and catalyst to the mixture at a ratio of 1:25, and stir evenly to form a pre-bleaching slurry. The third step is to put the pre-bleaching slurry into a photobleaching device and irradiate it with ultraviolet light to stimulate the decomposition of hydrogen peroxide to produce oxygen. The oxygen is further decomposed under the action of a catalyst to produce free radicals, thereby decomposing the organic matter in the fiber. The fourth step is to control the pH value of the photobleaching process between 3 and 6, and to control the bleaching time to 1-2 hours. The fifth step involves continuously washing the slurry after bleaching to remove hydrogen peroxide and catalyst from it.

2. The raw material fiber processing technology for Xuan paper production according to claim 1, characterized in that, The specific steps of mixing the pulverized fibers with water and continuously stirring to ensure full contact between the pulverized fibers and water include: The first step is to pour the pulverized fiber into a magnetic stirring tank and add water at a ratio of 5 times the weight of the fiber to water, so that the ratio of fiber to water is 1:

5. The second step is to seal the fixed cover of the magnetic stirring tank to the stirring tank. The third step involves thoroughly stirring the mixture of pulverized fiber and water using a magnetic stirring tank, ensuring that the pulverized fiber is evenly distributed in the water and that the pulverized fiber and water are in full contact. The magnetic stirring tank is a magnetic stirring device (10). The magnetic stirring device (10) includes a stirring plate (11), a magnetic system (12), and a stirring shaft (13). The stirring plate (11) is fixed at the bottom of the stirring shell. There are multiple stirring shafts (13), which are respectively set on the top of the stirring plate (11) for stirring the mixture inside the magnetic stirring device (10). The magnetic system (12) is fixed at the bottom of the stirring plate (11) for controlling the rotation of the stirring shaft (13). The stirring plate (11) is a magnetic plate, and the magnetic system (12) is an AC magnetizer. The AC magnetizer is used to generate an AC magnetic field at the bottom of the stirring plate (11).

3. The raw material fiber processing technology for Xuan paper production according to claim 2, characterized in that, The specific steps for removing impurities from the pulverized fiber and water using a rolling sieve device and screening the mixture of pulverized fiber and water include: The first step is to fix a circular sieve with a sieve hole diameter of 1cm onto the side wall of the rolling sieve device; The second step is to pour all the crushed fiber and water into the rolling sieve device; The third step is to start the rolling sieve device and make its rotation speed 100-150 rpm; Fourth step: Clean the impurities sieved out by the rolling sieve device every 30 minutes; The fifth step is to complete the screening of the pulverized fiber and water mixture when the impurities at the sieve are less than 10g within 30 minutes using the rolling sieve device.

4. The raw material fiber treatment process for Xuan paper production according to claim 3, characterized in that, The specific steps for removing moisture from the bleached mixture by vacuum drying to achieve rapid dehydration of the mixture include: The first step is to evenly distribute the bleached mixture within the working area of ​​the vacuum dryer; The second step is to turn on the vacuum dryer's suction function to quickly evaporate the moisture in the mixture; The third step is to monitor the pressure changes inside the vacuum dryer and ensure that the pressure reaches the set value. The fourth step is to completely remove the moisture using the residual pressure inside the vacuum dryer. Fifth step: Once all moisture has been removed, turn off the vacuum dryer.

5. The raw material fiber processing technology for Xuan paper production according to claim 4, characterized in that, The rolling sieving device includes a screen (20), a drum (30), a sieving chamber (40), a transmission device (50), and a protective cover (60). The screen (20) and the sieving chamber (40) are cylindrical. The drum (30) is fixed at the bottom of the sieving chamber (40). The screen (20) is located inside the drum (30) and is movably connected to the drum (30). The drum (30) and the sieving chamber (40) are arranged concentrically. The middle position of the drum (30) is fixedly connected to the output end of the transmission device (50). The transmission device (50) is used to drive the rolling sieving device to rotate. The protective cover (60) is fixed to the outermost side of the rolling sieving device and is used to protect the rolling sieving device.

6. The raw material fiber treatment process for Xuan paper production according to claim 5, characterized in that, The roller (30) includes a frame (31), a support frame (32), and a connecting mechanism (33). The frame (31) is disposed inside the screening chamber (40). The connecting mechanism (33) is arranged concentrically with the frame (31). The support frame (32) is fixed between the frame (31) and the connecting mechanism (33). The frame (31) has an inwardly curved fixing groove at its edge, the fixing groove has an S-shaped cross-section, and the screen (20) is pressed into the fixing groove by a fixing ring; The size of the fixing ring is smaller than the diameter of the frame (31). The fixing ring is made of rubber and its cross-sectional diameter is the same as the minimum transverse dimension of the cross-section of the fixing groove. The fixed ring has a protrusion at the point where it presses against the side wall of the frame (31), and the protrusion has a size of 0.5 mm.

7. The raw material fiber processing technology for Xuan paper production according to claim 6, characterized in that, The transmission device (50) includes a forward rotating motor (51) and a reverse rotating motor (52). The forward rotating motor (51) and the reverse rotating motor (52) are fixed on the left and right sides of the connecting mechanism (33) to drive the rolling screen device to rotate continuously and alternately, thereby reducing the torque force of the rolling screen device.

8. The raw material fiber treatment process for Xuan paper production according to claim 7, characterized in that, The diameter of the screening chamber (40) is 10 cm larger than the diameter of the frame (31), and it is used to store the material sieved by the screen (20).

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