Food paper and preparation process thereof

Abstract

The invention belongs to the technical field of paper manufacturing, and particularly relates to food paper and a preparation technology thereof.The preparation technology comprises the steps of pulp preparation, paper sheet forming, squeezing dehydration, drying, surface treatment, rolling and slitting. The performance of the paper is ensured, the use of chemical additives is effectively reduced, and the risk of environmental pollution is reduced.

Description

Technical Field

[0001] This invention belongs to the field of paper manufacturing technology, and particularly relates to a food paper and its preparation process. Background Technology

[0002] Food paper refers to all kinds of paper and paperboard specifically used for contacting, packaging, holding or processing food. Food paper production must use food-grade raw materials and strictly control the types and amounts of chemical additives.

[0003] Currently, food paper is mostly made from high-content wood pulp or 100% wood pulp. However, some paper mills at home and abroad use straw pulp instead of wood pulp to save wood resources in order to reduce costs when making food packaging paper, but this often sacrifices paper performance. In addition, whether it is straw pulp or wood pulp, bleached chemical pulp is used as papermaking raw material. The bleaching process of pulp will produce chemical substances that pollute the environment and will also cause paper products to contain chemical components that are harmful to human health.

[0004] Therefore, there is an urgent need for a safe and environmentally friendly food paper and its preparation process. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned technical problems by providing a food-grade paper and its preparation process. This process uses bamboo pulp as the main raw material and combines it with special pulping equipment and process parameter control to effectively reduce the use of chemical additives and lower the risk of environmental pollution while ensuring paper performance.

[0006] In view of this, the present invention provides a process for preparing food paper, comprising the following steps: Step 1: Put the bamboo pulp board into the pulper, add water and break it down evenly; put the broken pulp into the refiner and beat it evenly at a beating degree of 35-45°SR; put the beaten pulp into the mixing tank, add various chemical additives and stir evenly to obtain bamboo pulp liquid. Step 2: The bamboo pulp is evenly sprayed onto the wire mesh or wire mesh forming machine through the headbox to form a wet paper sheet, which is then dewatered by multiple press rollers. Step 3: The dehydrated paper sheets are dried through a steam drying cylinder group to a dryness of 92%~95% to obtain the base paper; Step 4: Coat the surface of the base paper with low-density polyethylene evenly, and then use a cooling roller to quickly cool and solidify the low-density polyethylene, which then bonds tightly to the base paper to obtain the finished paper. Step 5: Roll up the finished paper and cut it as needed.

[0007] In this technical solution, replacing traditional wood pulp raw materials with bamboo pulp raw materials can significantly reduce the pressure of logging on virgin forests and fast-growing plantations, making it more environmentally friendly. In addition, bamboo fiber is between the length of coniferous and broad-leaved wood, has good fiber bonding, and the paper made from it generally has high stiffness, burst strength, and tear resistance. Furthermore, bamboo pulp fiber has lower bacterial affinity, providing an extra layer of natural protection for food packaging.

[0008] In the above technical solution, further, the chemical additives in step two include wet strength agents, dry strength agents, sizing agents, fillers, and retention and filtration aids.

[0009] In the above technical solution, the pulping machine further includes: The machine body has a mixing chamber and a grinding chamber formed from top to bottom. A conveying hole is provided between the mixing chamber and the grinding chamber. A feeding port connected to the mixing chamber is provided at the top of the machine body, and a discharge pipe connected to the grinding chamber is provided at the bottom of the machine body. The mixing tank is set in the mixing chamber, with the feeding port opposite to the mixing tank. Multiple through holes are distributed at intervals on the bottom and side walls of the mixing tank. The stirring shaft is rotatably mounted on the top of the machine body, with its lower end extending into the mixing tank. Stirring blades are provided on the outer wall of the stirring shaft. Drive source one, drive source one can drive the stirring shaft to rotate; A fixed grinding disc is set in the grinding chamber. A feed hole is provided in the middle of the fixed grinding disc along the axial direction, and the feed hole is connected to the conveying hole. The movable grinding disc is located below the fixed grinding disc and is rotatably connected to the grinding chamber. The grinding shaft has one end coaxially connected to the movable grinding disc, and the other end extends through the side wall of the grinding chamber to the outside of the machine body. Drive source two, drive source two can drive the grinding shaft to rotate.

[0010] In the above technical solution, a transmission wheel one is further provided on the stirring shaft, a transmission shaft is rotatably provided on the side wall of the machine body, a transmission wheel two and a transmission wheel three are respectively provided at both ends of the transmission shaft, a transmission wheel four is provided at one end of the grinding shaft, the transmission wheel one and the transmission wheel two are connected by transmission component one, and the transmission wheel three and the transmission wheel four are connected by transmission component two.

[0011] In the above technical solution, furthermore, protective shells are provided on the outside of transmission wheel one, transmission wheel two, transmission wheel three, transmission wheel four, transmission component one, and transmission component two, and the protective shells are detachably connected to the machine body.

[0012] In the above technical solution, the mixing tank is further horizontally slidably connected to the side wall of the mixing chamber, and a vibration drive component is provided in the mixing chamber to drive the mixing tank to reciprocate horizontally.

[0013] In the above technical solution, the vibration driving component further includes: Guide holes are provided on the side wall of the mixing chamber. The guide column is set on the side wall of the mixing tank and is slidably set in the guide hole in the horizontal direction; An elastic element is disposed between the mixing tank and the side wall of the mixing chamber; A cam is mounted in the mixing chamber and rotates, contacting the side wall of the mixing tank. The vibrating shaft has a cam at one end and extends through the side wall of the mixing chamber to the outside of the machine body at the other end. Drive source three is installed on the machine body and can drive the vibration shaft to rotate.

[0014] In the above technical solution, a guide plate is further provided at the bottom of the mixing chamber. The upper surface of the guide plate is gradually concave downward from the outside to the inside, and a through hole communicating with the conveying hole is provided in the middle of the guide plate.

[0015] In the above technical solution, the top of the machine body is provided with a detachable top plate, which can open and close the mixing chamber; the bottom of the machine body is provided with a detachable bottom plate, which can open and close the grinding chamber.

[0016] The present invention also discloses a food paper prepared by the aforementioned preparation process.

[0017] The beneficial effects of this invention are: 1. Bamboo pulp is used as the main raw material for papermaking. Bamboo has a short growth cycle and is highly renewable, reducing dependence on wood resources. By controlling the beating degree within a specific range of 35-45°SR, proper fiber fibrillation is ensured while avoiding fiber damage caused by over-beating, thus optimizing the physical properties of the paper. In addition, low-density polyethylene is used as the coating material, which has good barrier properties and food safety, effectively preventing food contamination.

[0018] 2. Stirring the raw materials before grinding ensures their fluidity and improves the quality of the pulp. In addition, integrating the stirring and grinding functions into the same equipment reduces the equipment footprint and material transfer steps, thereby improving production efficiency.

[0019] 3. The use of a single power source to drive both the mixing and grinding systems simultaneously reduces equipment energy consumption and manufacturing costs.

[0020] 4. The horizontal reciprocating motion of the mixing tank generates eddies and relative motion in the slurry, improving the uniformity of mixing; and the vibration of the mixing tank can effectively prevent fibers from accumulating and clogging at the through holes, ensuring the smooth passage of the slurry. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0022] Figure 1 This is a process flow diagram of the present invention.

[0023] Figure 2 This is a schematic diagram of the shape of the pulping machine in this invention. Figure 1 .

[0024] Figure 3 This is a schematic diagram of the shape of the pulping machine in this invention. Figure 2 .

[0025] Figure 4 This is a schematic diagram of the internal structure of the pulping machine in this invention. Figure 1 .

[0026] Figure 5 This is a schematic diagram of the internal structure of the pulping machine in this invention. Figure 2 .

[0027] Figure 6 This is a schematic diagram of the internal structure of the pulping machine in this invention. Figure 3 .

[0028] Figure 7 This is a schematic diagram of the longitudinal cross-sectional structure of the internal structure of the pulper in this invention.

[0029] Figure 8 This is a schematic diagram of the connection structure between the fixed grinding disc and the grinding chamber in the grinding mill of the present invention.

[0030] The markings in the diagram are as follows: 1. Machine body; 101. Mixing chamber; 102. Grinding chamber; 103. Conveying hole; 104. Feeding port; 105. Discharge pipe; 201. Top plate; 202. Bottom plate; 3. Mixing tank; 301. Through hole; 4. Mixing shaft; 401. Mixing blade; 5. Drive source one; 6. Fixed grinding disc; 601. Feeding hole; 7. Movable grinding disc; 8. Grinding shaft; 901. Transmission wheel one; 902. Transmission wheel two; 903. Transmission wheel three; 904. Transmission wheel four; 905. Transmission component one; 906. Transmission component two; 10. Transmission shaft; 11. Protective shell; 12. Guide column; 13. Elastic component; 14. Cam; 15. Vibration shaft; 16. Drive source three; 17. Baffle plate; 18. Adjusting screw. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the invention. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0033] The first objective of this invention is to provide a process for preparing food paper. Example 1 includes the following steps: Step 1: Put the bamboo pulp board into the pulper and add an appropriate amount of water to break it down; put the broken pulp into the refiner and beat it evenly at a beating degree of 38°SR; put the beaten pulp into the mixing tank and add 1.5% wet strength agent, 1% dry strength agent, 0.8% sizing agent, 15% filler and 0.5% retention and filtration aid, and stir evenly to obtain bamboo pulp liquid. Step 2: The bamboo pulp is evenly sprayed onto the wire mesh or wire mesh forming machine through the headbox to form a wet paper sheet, which is then dewatered by multiple press rollers. Step 3: The dehydrated paper sheets are dried to 93% dryness using a steam drying cylinder group to obtain the base paper; Step 4: Apply a 0.02mm thick low-density polyethylene coating evenly to the surface of the base paper, and then use a cooling roller to rapidly cool and solidify the low-density polyethylene, which then bonds tightly to the base paper to obtain the finished paper. Step 5: Roll up the finished paper and cut it as needed.

[0034] Example 2 This embodiment is basically the same as Embodiment 1, except that the beating degree is controlled at 42°SR, and the amount of chemical additives is adjusted to: 2% wet strength agent, 1.2% dry strength agent, 1% sizing agent, 18% filler, and 0.6% retention and filtration aid. The coating thickness is adjusted to 0.03mm.

[0035] Example 3 This embodiment is basically the same as embodiment 1, except that a mesh forming device is used instead of a long mesh forming device, the drying degree is controlled at 94%, and the coating material is food-grade polyethylene.

[0036] Comparative Example 1 The traditional wood pulping process was used, with 100% bleached wood pulp and a freeness of 30°SR. Other process conditions were the same as in Example 1.

[0037] Comparative Example 2 The process of mixing straw pulp and wood pulp (straw pulp:wood pulp = 3:7) was adopted, with a freeness of 40°SR. Other process conditions were the same as in Example 1.

[0038] Performance testing The performance of the food paper prepared in Examples 1-3 and Comparative Examples 1-2 was tested, and the results are as follows: Test Project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 <![CDATA[Quantitative (g / m 2 )]]> 65.2 66.8 64.9 65.5 66.1 Tensile strength (kN / m) 4.8 5.2 4.9 4.5 3.8 Tear strength (mN) 680 720 695 950 580 Air permeability (μm / Pa·s) 2.1 1.8 2.0 2.5 3.2 Smoothness (s) 35 38 36 32 28 Microbial limits (CFU / g) ＜100 ＜100 ＜100 ＜100 ＜100 Heavy metal content (mg / kg) Not detected Not detected Not detected 0.5 0.8 Test results show that the food paper prepared by this invention is superior to the comparative example in terms of strength, surface properties and hygiene, especially compared with the straw pulp mixing process, all properties are significantly improved.

[0039] Improvements to the pulping machine The second objective of this invention is to design a pulping machine; like Figures 2-8 As shown, the pulping machine includes: a machine body 1, a mixing tank 3, a mixing shaft 4, a drive source 1 5, a fixed grinding disc 6, a movable grinding disc 7, a pulping shaft 8, and a drive source 2. Please see Figure 4 and Figure 6 The machine body 1 has a mixing chamber 101 and a grinding chamber 102 formed from top to bottom. The mixing chamber 101 and the grinding chamber 102 are separated by a partition. A conveying hole 103 is provided on the partition to transfer the slurry in the mixing chamber 101 to the grinding chamber 102. For example, the machine body 1 can be made of stainless steel. One side plate of the machine body 1 can be connected by a hinge to form a door structure, so that the internal space of the machine body 1 can be opened and closed. A sealing strip can be provided between the door structure and the machine body 1 to ensure the airtightness of the equipment during operation. Please see Figure 2 and Figure 3The top of the machine body 1 is provided with a detachable top plate 201, which can open and close the mixing chamber 101. For example, the top plate 201 can be connected to the machine body 1 by threaded fasteners. The bottom of the machine body 1 is provided with a detachable bottom plate 202, which can open and close the grinding chamber 102. For example, the bottom plate 202 can be connected to the machine body 1 by threaded fasteners. In addition, sealing strips can be provided between the top plate 201 and the bottom plate 202 and the machine body 1 to ensure the airtightness of the equipment during operation. Please see Figure 2 The top of the machine body 1 is provided with a feeding port 104 that communicates with the mixing chamber 101. The feeding port 104 is located on the top plate 201. Raw materials can be fed into the mixing chamber 101 through the feeding port 104. Please refer to [link / reference]. Figure 3 and Figure 5 The bottom of the machine body 1 is provided with a discharge pipe 105 that communicates with the grinding chamber 102. The discharge pipe 105 is set on the bottom plate 202. A solenoid valve is installed on the discharge pipe 105. During the grinding process, the solenoid valve cuts off the discharge pipe 105 to ensure that the slurry is stably ground in the grinding chamber 102. After grinding is completed, a pump can be connected to the discharge pipe 105. After the solenoid valve opens the discharge pipe 105, the pump starts to discharge the ground slurry in the grinding chamber 102 through the discharge pipe 105. Please see Figure 4 The mixing tank 3 is set in the mixing chamber 101. The feeding port 104 is opposite to the mixing tank 3. After the raw material is introduced through the feeding port 104, it will enter the mixing tank 3. Multiple through holes 301 are distributed at intervals on the bottom surface and side wall of the mixing tank 3. For example, the mixing tank 3 can be made of stainless steel. The stirring shaft 4 is rotatably mounted on the top plate 201. The lower end of the stirring shaft 4 extends into the stirring tank 3. The stirring blades 401 are provided on the outer wall of the stirring shaft 4. The upper end of the stirring shaft 4 extends out of the upper surface of the top plate 201. The drive source 5 is installed on the top plate 201. The drive source 5 can drive the stirring shaft 4 to rotate. For example, the drive source 5 can be a motor, and the output shaft of the motor is connected to the stirring shaft 4 through a coupling. After the raw materials are put into the mixing tank 3, the drive source 5 drives the stirring shaft 4 to rotate. The stirring shaft 4, along with the stirring blades 401, stirs the raw materials in the mixing tank 3, ensuring the fluidity of the raw materials and preventing them from clumping. The stirred raw materials can pass through the through hole 301 to the bottom of the mixing chamber 101 and then through the conveying hole 103 into the grinding chamber 102.

[0040] Please see Figure 6 and Figure 7The fixed grinding disc 6 is set in the grinding chamber 102. The center of the fixed grinding disc 6 is provided with a feed hole 601 along the axial direction. The feed hole 601 is connected to the conveying hole 103. The movable grinding disc 7 is set below the fixed grinding disc 6. The movable grinding disc 7 is rotatably connected to the grinding chamber 102. The raw material that enters the grinding chamber 102 through the conveying hole 103 will pass through the feed hole 601 and come between the fixed grinding disc 6 and the movable grinding disc 7. The movable grinding disc 7 can grind the raw material by rotating relative to the fixed grinding disc 6. For example, please refer to Figure 8 The partition plate forms a cylindrical protrusion in the grinding chamber 102. The conveying hole 103 passes through the protrusion. The diameter of the feed hole 601 is slightly larger than the outer diameter of the protrusion. The fixed grinding disc 6 is sleeved on the outside of the protrusion through the feed hole 601. The fixed grinding disc 6 is slidably connected to the side wall of the grinding chamber 102 along the axial direction. A threaded hole is provided on the partition plate. An adjusting screw 18 is rotatably connected to the fixed grinding disc 6. The adjusting screw 18 is threadedly connected to the threaded hole. By rotating the adjusting screw 18, the distance between the fixed grinding disc 6 and the movable grinding disc 7 can be adjusted, thereby adjusting the beating degree of the grinding. Please see Figure 7 One end of the grinding shaft 8 is coaxially connected to the movable grinding disc 7, and the other end of the grinding shaft 8 extends through the base plate 202 and out to the outside of the machine body 1. The second drive source is mounted on the base plate 202. The second drive source can drive the grinding shaft 8 to rotate. For example, the second drive source can be a motor, and the output shaft of the motor is connected to the grinding shaft 8 through a coupling.

[0041] As a preferred embodiment, please refer to Figure 4 and Figure 5 A transmission wheel 901 is installed on the stirring shaft 4, and a transmission shaft 10 is rotatably installed on the side wall of the machine body 1. Transmission wheels 902 and 903 are respectively installed at both ends of the transmission shaft 10. A transmission wheel 904 is installed at one end of the grinding shaft 8. Transmission wheels 901 and 902 are connected by transmission component 905, and transmission wheels 903 and 904 are connected by transmission component 906. In this way, a single power source can drive both the stirring and grinding systems simultaneously, reducing equipment energy consumption and manufacturing costs. For example, if each transmission wheel is a pulley, then transmission component 1 905 and transmission component 2 906 are transmission belts; if each transmission wheel is a sprocket, then transmission component 1 905 and transmission component 2 906 are transmission chains. Figure 5What is shown is that, based on the use of drive shaft 10, four drive wheels and two drive components, an additional pair of external meshing gear sets and a connecting shaft are added. The connecting shaft is mounted on the base plate 202, and drive wheels 904 and one gear are coaxially mounted on the connecting shaft. Another gear is mounted on the grinding shaft 8. In this way, the external meshing gear set can be a reduction gear set or a speed-increasing gear set to achieve differential operation of the grinding system and the mixing system.

[0042] As a preferred embodiment, in order to protect the various transmission structures outside the body 1, a protective shell 11 is also provided on the body 1. Please refer to [link / reference]. Figure 2 and Figure 3 The protective shell 11 can cover each transmission wheel and each transmission component. The protective shell can be detachably connected to the machine body 1, such as by threaded fasteners. The protective shell 11 can prevent dust, moisture and other foreign objects from entering the transmission system, thus extending the service life of the equipment. It can also effectively prevent operators from contacting the transmission components, reducing the risk of safety accidents.

[0043] As a preferred embodiment, the mixing tank 3 is horizontally slidably connected to the side wall of the mixing chamber 101, and the mixing chamber 101 is provided with a vibration drive component that drives the mixing tank 3 to reciprocate horizontally. Please see Figure 4 , Figure 6 as well as Figure 7 The vibration drive components include: a guide hole, a guide post 12, an elastic element 13, a cam 14, a vibration shaft 15, and a drive source 16. The guide hole is set on the side wall of the mixing chamber 101; the guide column 12 is set on the side wall of the mixing tank 3. The guide column 12 is slidably set in the guide hole in the horizontal direction. Multiple sets of guide columns 12 can be set to cooperate with the guide hole to improve the stability of the horizontal movement of the mixing tank 3. During the horizontal movement of the mixing tank 3, the position of the stirring shaft 4 does not change, and the stirring blade 401 will not contact the inner wall of the mixing tank 3. The elastic element 13 is disposed between the mixing tank 3 and the side wall of the mixing chamber 101. For example, the elastic element 13 can be a spring or rubber. One end of the elastic element 13 is connected to the outer wall of the mixing tank 3, and the other end is connected to the side wall of the mixing chamber 101. Cam 14 is rotatably disposed in stirring chamber 101 and contacts the side wall of stirring tank 3; vibration shaft 15 is rotatably connected to top plate 201, one end of vibration shaft 15 is connected to cam 14, and the other end of vibration shaft 15 extends through top plate 201 and out of machine body 1. The drive source 3 16 is mounted on the machine body 1. The drive source 3 16 can drive the vibration shaft 15 to rotate. For example, the drive source 3 16 can be a motor, and the output shaft of the motor is connected to the vibration shaft 15 through a coupling. The cam 14 and the elastic element 13 drive the mixing tank 3 to reciprocate in the horizontal direction to generate vibration, which can improve the efficiency of the stirred raw material passing through the through hole 301.

[0044] As a preferred embodiment, please refer to Figure 4 and Figure 7 A guide plate 17 is provided at the bottom of the mixing chamber 101. The upper surface of the guide plate 17 is gradually recessed from the outside to the inside. A through hole communicating with the conveying hole 103 is provided in the middle of the guide plate 17. For example, the guide plate 17 can be detachably connected to the side wall of the mixing chamber 101, such as by threaded fasteners. The guide plate 17 can make the raw material leaving the mixing tank 3 converge at the conveying hole 103, reducing the resistance to the flow of the raw material.

[0045] The embodiments of the present invention have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A process for preparing food-grade paper, characterized in that, Includes the following steps: Step 1: Put the bamboo pulp board into the pulper, add water and break it down evenly; put the broken pulp into the refiner and beat it evenly at a beating degree of 35-45°SR; put the beaten pulp into the mixing tank, add various chemical additives and stir evenly to obtain bamboo pulp liquid. Step 2: The bamboo pulp is evenly sprayed onto the wire mesh or wire mesh forming machine through the headbox to form a wet paper sheet, which is then dewatered by multiple press rollers. Step 3: The dehydrated paper sheets are dried through a steam drying cylinder group to a dryness of 92%~95% to obtain the base paper; Step 4: Coat the surface of the base paper with low-density polyethylene evenly, and then use a cooling roller to quickly cool and solidify the low-density polyethylene, which then bonds tightly to the base paper to obtain the finished paper. Step 5: Roll up the finished paper and cut it as needed.

2. The preparation process of food paper according to claim 1, characterized in that: The chemical additives mentioned in step two include wet strength agents, dry strength agents, sizing agents, fillers, and retention and filtration aids.

3. The preparation process of food paper according to claim 1, characterized in that, The pulping machine includes: The machine body (1) has a mixing chamber (101) and a grinding chamber (102) formed from top to bottom inside the machine body (1). A conveying hole (103) is provided between the mixing chamber (101) and the grinding chamber (102). A feeding port (104) communicating with the mixing chamber (101) is provided at the top of the machine body (1). A discharge pipe (105) communicating with the grinding chamber (102) is provided at the bottom of the machine body (1). A mixing tank (3) is arranged in the mixing chamber (101). The feeding port (104) is opposite to the mixing tank (3). Multiple through holes (301) are distributed at intervals on the bottom surface and side wall of the mixing tank (3). A stirring shaft (4) is rotatably mounted on the top of the machine body (1). The lower end of the stirring shaft (4) extends into the stirring tank (3). Stirring blades (401) are provided on the outer wall of the stirring shaft (4). Drive source one (5), which can drive the stirring shaft (4) to rotate; A fixed grinding disc (6) is provided in the grinding chamber (102). The fixed grinding disc (6) has a feed hole (601) in the middle along the axial direction. The feed hole is connected to the conveying hole (103). A movable grinding disc (7) is disposed below the fixed grinding disc (6) and is rotatably connected to the grinding chamber (102); A grinding shaft (8) is provided, one end of which is coaxially connected to the movable grinding disc (7), and the other end of which extends through the side wall of the grinding chamber (102) to the outside of the machine body (1). Drive source two, which can drive the grinding shaft (8) to rotate.

4. The preparation process of food paper according to claim 3, characterized in that: A transmission wheel 1 (901) is provided on the stirring shaft (4), and a transmission shaft (10) is rotatably provided on the side wall of the machine body (1). A transmission wheel 2 (902) and a transmission wheel 3 (903) are respectively provided at both ends of the transmission shaft (10). A transmission wheel 4 (904) is provided at one end of the grinding shaft (8). The transmission wheel 1 (901) and the transmission wheel 2 (902) are connected by a transmission component 1 (905), and the transmission wheel 3 (903) and the transmission wheel 4 (904) are connected by a transmission component 2 (906).

5. The preparation process of food paper according to claim 4, characterized in that: The transmission wheel one (901), transmission wheel two (902), transmission wheel three (903), transmission wheel four (904), transmission component one (905) and transmission component two (906) are provided with protective shells (11), and the protective shells (11) are detachably connected to the body (1).

6. The preparation process of food paper according to claim 3, characterized in that: The mixing tank (3) is horizontally slidably connected to the side wall of the mixing chamber (101), and the mixing chamber (101) is provided with a vibration drive component that drives the mixing tank (3) to reciprocate horizontally.

7. The preparation process of food paper according to claim 6, characterized in that: The vibration driving component includes: A guide hole is provided on the side wall of the stirring chamber (101); Guide post (12), the guide post (12) is disposed on the side wall of the mixing tank (3), and the guide post (12) is slidably disposed in the guide hole in the horizontal direction; An elastic element (13) is disposed between the mixing tank (3) and the side wall of the mixing chamber (101); A cam (14) is rotatably disposed in the stirring chamber (101) and the cam (14) contacts the side wall of the stirring tank (3); Vibrating shaft (15), one end of which is connected to the cam (14), and the other end of which extends through the side wall of the stirring chamber (101) to the outside of the machine body (1); Drive source three (16) is disposed on the body (1) and can drive the vibration shaft (15) to rotate.

8. The preparation process of food paper according to claim 3, characterized in that: The bottom of the stirring chamber (101) is provided with a guide plate (17), the upper surface of the guide plate (17) is gradually concave downward from the outside to the inside, and the middle part of the guide plate (17) is provided with a through hole communicating with the conveying hole (103).

9. The preparation process of food paper according to claim 3, characterized in that: The top of the machine body (1) is provided with a detachable top plate (201), which can open and close the mixing chamber (101); the bottom of the machine body (1) is provided with a detachable bottom plate (202), which can open and close the grinding chamber (102).

10. A food paper, prepared using the preparation process described in any one of claims 1-9.

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