An ecological paper made from rouge radish residue and its preparation method

Abstract

The present invention discloses a ecological paper made from rouge radish residue and its preparation method, which relates to the technical field of pulp and paper making. In the present invention, the rouge radish residue discarded after extracting anthocyanin is used as a raw material, and is treated by the caustic soda pulping method. After being crushed by a homogenizer, it is sent to a beater to make pulp with a beating degree of 30~55°SR. After sizing, it is made into paper, and the ecological paper made from rouge radish residue meeting various performance indicators is prepared. Through a series of designs in the present invention, the pulping process does not require bleaching, and only low-concentration sodium hydroxide is used during cooking. The "three wastes" discharged during the production process are less, and the environmental pollution to the surrounding area is small; the degree of continuity in the manufacturing process is high, the operation difficulty is low, and the requirements for operators are not high; the ecological paper made from rouge radish residue is safe, non-toxic, light, has good toughness and high folding endurance; the raw material uses the radish residue discarded by anthocyanin production enterprises after extracting anthocyanin, which is convenient to obtain, the raw materials are sufficient, and the treatment method is simple.

Description

Technical Field

[0001] The present invention belongs to the technical field of pulp and paper making, and particularly relates to a ecological paper made from rouge radish residue and a preparation method thereof. Background Art

[0002] According to the statistics of the Food and Agriculture Organization of the United Nations, from 2000 to 2018, 157 million hectares of forests were destroyed globally. The booming development of the paper industry is one of the main reasons for the rapid disappearance of forests. Forests are an important part of the ecological environment and have multiple impacts on climate change. In recent years, in order to address climate change and strengthen ecological environment protection, countries have successively introduced a series of measures to restrict deforestation, and the wood resources are becoming increasingly tense. Paper-making enterprises hope to use non-woody plants with short growth cycles to replace some woody plants as papermaking raw materials. On the other hand, a part of the agricultural and forestry waste generated in China every year is non-woody plants. If it can be reasonably utilized, it can not only alleviate the problem of resource shortage, but also reduce the environmental pressure. Therefore, the papermaking technology using non-woody plants as raw materials has gradually become a research and development hotspot. At present, some technical solutions for manufacturing paper using non-woody plants such as gramineous plants, liana plants, and herbaceous plants as raw materials have been disclosed, as follows:

[0003] Chinese Patent Application No. 201510203856.3 discloses a method for manufacturing natural color household paper using corn straw as raw material. The corn straw is air-dried and the ears and leaves are removed, leaving its outer skin and pith, and cut into pieces with a length of about 15-30 mm. Through steps such as dust removal, pre-impregnation, cooking, washing, pulp adjustment, and paper making, natural color household paper is obtained. The yield of crude pulp is ≥40%, the beating degree is 35-40°SR, the basis weight of the drawn paper made is 15.0±0.5 g / m2, and the basis weight of the rolled paper is 14.5±0.5 g / m2.

[0004] Chinese Patent Application No. 201710380372.5 discloses a preparation method of handmade Yanteng paper. The skins of yellow rattan, green rattan, purple rattan, and mountain rattan are selected as raw materials, washed and cut into strips with a length of 3-5 cm, crushed and soaked, alkaline sodium sulfite is added, stirred and cooked, hydrogen peroxide is added for bleaching, poured into the mixed pulp and starfruit vine juice, and fully stirred to make pulp. Then, through paper making, pressing, paper drying, and finishing, white and natural color Yanteng paper is obtained, with a tightness of 0.4-0.6 g / cm3, a longitudinal breaking length of ≥3 km, and a basis weight of 37.0±0.9 g / m2.

[0005] Chinese Patent Application No. 202110861980.4 discloses a method for making gourd vine paper. Using gourd vine strips as raw materials, through processes such as stock preparation, soaking, cutting, retting pulp, rough pounding, cleaning, steaming, fine grinding, sizing, paper fishing, paper drying, and paper peeling, it takes about 3 to 4 months to make gourd vine paper suitable for calligraphy and painting creation. Its whiteness is 60 - 65%, and its tensile strength is 65.3 - 74.6 N·m / g.

[0006] Chinese Patent Application No. 201410335005.6 discloses a method for preparing pulp, paper products from bamboo fibers and its preparation method. The bamboo fibers are chopped and made into natural color paper through processes such as steaming, defibering, pulping, screening, washing, and papermaking. Its whiteness is 20 - 40%, its tensile strength ≥ 7.9 N·m / g, its folding endurance is 15 - 200 times, its breaking length is 5 - 10 km, and its tearing degree is 200 - 650 mN.

[0007] Chinese Patent Application No. 201610805732.7 discloses a method for preparing Chinese herbal medicine residue natural color pulp and packaging paper. Using Chinese herbal medicine residue as raw materials, through processes such as slag removal, washing, extrusion, steaming, defibering, and screening, natural color pulp is obtained, and then it is paper - made, pressed, and dried to make natural color packaging paper. The methods used for steaming are sulfate method, soda - anthraquinone method, and alkaline sulfite method. The pulp beating consistency is 5 - 15%, and the beating degree is 20 - 50°SR. The main physical performance indicators of the obtained natural color packaging paper are as follows: bulk density is 25 - 27 cm3 / g, tensile index is 26 - 28 N·m / g, burst index is 1.3 - 1.8 kPa·m2 / g, and tear index is 10 - 12 mN·m2 / g.

[0008] The above - mentioned technical methods all use non - woody plants as raw materials to produce cultural paper and household paper with main performance indicators meeting the usage requirements. However, these methods have the following disadvantages:

[0009] (1) The technological process is relatively cumbersome and complex. From material collection, raw material treatment to paper making, it often has to go through more than a dozen processes, with high energy consumption and low production efficiency.

[0010] (2) It involves a relatively large number of mechanical equipment, requiring operators to have rich production experience and skilled manufacturing techniques.

[0011] (3) The manufacturing cycle is long. From material collection to paper making, it usually takes more than 1 month, resulting in slow market entry of products and affecting the capital turnover speed of enterprises.

[0012] (4) During the cooking process, anthraquinone, ammonium sulfite, sulfite, sulfate, etc. are added, and hydrogen peroxide, etc. is used during the bleaching process. If large-scale industrial production is carried out, a large amount of wastewater will be generated, causing a certain degree of pollution to the surrounding environment; if some chemical reagents are recycled and reused, the energy consumption will increase.

[0013] Therefore, it is necessary to develop a process route with short process, simple operation, low energy consumption, low equipment requirements and small pollution to manufacture safe and non-toxic ecological paper from rouge radish residue, providing technical support for the formation of a regional green and low-carbon vertical integration industrial chain cluster of rouge radish. Summary of the Invention

[0014] The purpose of the present invention is to provide a kind of ecological paper made from rouge radish residue and its preparation method, which has a short process route, low time consumption, simple operation, low energy consumption, low raw material cost, simple treatment method, and the product is green, safe and non-toxic, and can prepare ecological paper made from rouge radish residue that meets various performance indicators, which can be used in the fields of calligraphy and painting, printing, packaging, etc.

[0015] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0016] The present invention is a kind of ecological paper made from rouge radish residue, including the following steps:

[0017] S1: Cooking: Using the waste rouge radish residue as raw material and 2 - 5% sodium hydroxide aqueous solution are put into the cooking equipment according to the weight ratio of 1:6 - 1:10, heated to 100 - 130 °C and maintained for 2 - 10 h, then the rouge radish residue enters the blow tank through the screw discharger;

[0018] S2: Cleaning: Adding clear water for washing and filtering until the filtrate is colorless;

[0019] S3: Crushing: Adding water to the filter residue according to the weight ratio of 1:2 - 1:3, using a homogenizer to crush the fiber tissue of the rouge radish residue, the rotation speed of the homogenizer is 8000 - 12000 rpm / min, each time for 20 s, with an interval of 30 s, for 5 - 10 consecutive times, to obtain a pulp with a beating degree of 30 - 55 °SR;

[0020] S4: Pulp mixing: Pumping the pulp into the pulp mixing tank through a pulp pump, adding plant gum and clear water, starting the stirring device to stir evenly, the stirring speed is 700 - 1000 rpm / min, and the stirring time is 10 - 30 min;

[0021] S5: Papermaking: The prepared pulp flows into the papermaking tank, and is further stirred to make the pulp evenly dispersed, and then operate the papermaking machine to make paper; the amplitude of the shaking device in the wire part of the papermaking machine is 8 - 16 mm, the oscillation frequency is 100 - 400 times / min; the pulp - to - wire speed ratio is 0.9 - 1.1;

[0022] S6: Extrusion: Stack the wet paper sheet made by papermaking together with the mold, place them on the pressing position of the press, and extrude to dehydrate; the line pressure of the press roll is 0.2 - 0.6 MPa;

[0023] S7: Drying: Use the conveyor belt to transfer the formed wet paper sheet to the drying device for drying to make the dryness of the paper sheet reach 90 - 96%; and the running speed of the paper is 10 - 50 m / min, and the time is 20 - 40 s.

[0024] Furthermore, the cooking equipment in S1 is an intermittent or continuous digester.

[0025] Furthermore, the dosage of the plant gum in S4 is 10 - 30% of the red radish residue, and the plant gum is kiwi vine juice, abelmoschus manihot juice, carambola vine juice or bletilla striata pulp.

[0026] Furthermore, the pressing felt screen cloth specification of the press in S6 is 800 - 1400 g / m2, and the mesh number is 70 - 90 meshes.

[0027] Furthermore, the drying of the drying device in S7 is divided into three stages. The temperature of the first stage is 30 - 45 °C, the temperature of the second stage is 50 - 60 °C, and the temperature of the third stage is 65 - 75 °C.

[0028] An ecological paper made of red radish residue, and the ecological paper is prepared by using the above - mentioned production method of the ecological paper made of red radish residue.

[0029] The present invention has the following beneficial effects:

[0030] The raw material is the radish residue discarded by anthocyanin production enterprises after extracting anthocyanin. Therefore, the material is convenient to obtain, the raw material is sufficient, and the treatment method is simple;

[0031] The pulping process does not require bleaching, only a low - concentration sodium hydroxide is used during cooking, and the "three wastes" discharged during the production process are less, and the environmental pollution to the surrounding area is small;

[0032] Reasonably utilize the waste biomass resources, reduce the environmental pressure on the surrounding area, and weaken the dependence of the papermaking industry on woody plant resources;

[0033] The process flow is short, the flexibility is strong, the energy consumption is less, and the pulp formula and consistency can be adjusted according to actual needs to make calligraphy and painting paper, packaging paper, and printing paper;

[0034] The required mechanical equipment is less, the floor area is small, and the resource utilization rate is high; the degree of continuity in the manufacturing process is high, the operation difficulty is low, and the requirements for operators are not high;

[0035] The ecological paper made of red radish residue manufactured is safe, non - toxic, light, has good toughness, and high folding endurance. Embodiment

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0037] A method for making ecological paper from rouge radish residue includes the following steps:

[0038] Cooking: Put the discarded rouge radish residue and 2% sodium hydroxide aqueous solution into the cooking equipment according to a weight ratio of 1:6, heat to 110°C and keep for 4h, then the rouge radish residue enters the blow tank through a screw discharger;

[0039] Among them, the concentration of the sodium hydroxide aqueous solution can be between 2% and 5%, the weight ratio of the discarded rouge radish residue raw material to the sodium hydroxide aqueous solution can be between 1:6 and 1:10, the heating temperature can be between 100°C and 130°C, and the holding time can be between 2h and 10h;

[0040] The cooking equipment can be an intermittent or continuous cooker. In this embodiment, a continuous cooker is used;

[0041] (2) Cleaning: Add clear water for washing and filtration until the filtrate is colorless;

[0042] (3) Crushing: Add water to the filter residue, and the weight ratio of the filter residue to water can be between 1:2 and 1:3. Here, the weight ratio of the filter residue to water is 1:2;

[0043] Use a homogenizer to crush the radish residue fiber tissue. The rotation speed of the homogenizer can be 8000 - 12000 rpm / min. Here, it is specifically 10000 rpm / min, for 20s each time, with a 30s interval, for 5 consecutive times, to obtain a pulp with a beating degree of 35°SR;

[0044] Among them, the number of consecutive times can be between 5 and 10;

[0045] Pulp blending: Pump the pulp into the pulp blending tank through a pulp pump, add kiwifruit vine juice and clear water, and stir evenly; the dosage of kiwifruit vine juice is 15% of the weight of the radish residue;

[0046] The stirring speed can be 700 - 1000 rpm / min, and the stirring time can be 10 - 30 min. Here, the stirring speed is 700 rpm / min and the stirring time is 20 min;

[0047] Moreover, the dosage of the plant gum can be between 10% and 30% of the rouge radish residue, and the plant gum can also be Abelmoschus manihot juice, Averrhoa carambola vine juice or Bletilla striata pulp;

[0048] In other embodiments, it is also possible to decide whether to add other fiber slurries according to requirements. The other fiber slurries can be various plant fiber slurries;

[0049] Paper making: The prepared pulp flows into the paper-making pool and is further stirred to evenly disperse the pulp, and then the paper-making machine is operated to make paper;

[0050] The amplitude of the shaking device in the wire section of the paper-making machine can be 8 - 16 mm, the oscillation frequency can be 100 - 400 times / min; the pulp-to-wire speed ratio can be 0.9 - 1.1. In this embodiment, the amplitude of the shaking device in the wire section of the paper-making machine is 8 mm, the oscillation frequency is 120 times / min; the pulp-to-wire speed ratio is 0.9;

[0051] Pressing: The wet paper sheet made and the mold are stacked together and placed on the pressing position of the press to squeeze out water;

[0052] Among them, the line pressure of the press roll can be 0.2 - 0.6 MPa, and here it is 0.2 MPa; the specification of the press felt mesh cloth of the press can be 800 - 1400 g / m2, and here it is 800 g / m2; the mesh number can be 70 - 90 meshes, and here it is specifically 80 meshes;

[0053] Drying: The formed wet paper sheet is transported to the drying device by a conveyor belt for drying to make the dryness of the paper sheet reach 90 - 96%;

[0054] The drying of the drying device is divided into three stages. The temperature of the first stage is 30 - 45 °C, the temperature of the second stage is 50 - 60 °C, and the temperature of the third stage is 65 - 75 °C. In this embodiment, the temperature of the first stage is 40 °C, the temperature of the second stage is 55 °C, and the temperature of the third stage is 65 °C;

[0055] Moreover, the walking speed of the paper can be 10 - 50 m / min, and the time can be 20 - 40 s. Here, the walking speed of the paper is specifically 20 m / min, and the time is specifically 20 s;

[0056] The tensile strength of the made ecological paper from rouge radish residue is 2.3 MPa, the elongation at break is 6.7%, the folding endurance is 180 times, the whiteness is 25%, and the water content is 6%.

[0057] The process route of the present invention is short, the time consumption is low, the operation is simple, the energy consumption is small, the raw material cost is low, the treatment method is simple, and the product is green, safe and non-toxic. Compared with the existing process methods, it is more suitable for industrial production of ecological paper from radish residue. Embodiment

[0058] A method for making ecological paper from rouge radish residue, comprising the following steps:

[0059] (1)Steaming: Put the waste carmine radish residue and 4% sodium hydroxide aqueous solution into the steaming equipment at a weight ratio of 1:8, heat to 125 °C and keep for 8 h, then let the carmine radish residue enter the blow tank through the screw discharger.

[0060] (2)Washing: Add clear water for washing and suction filtration until the filtrate is colorless.

[0061] (3)Crushing: Add water to the filter residue at a weight ratio of 1:3, and use a homogenizer to crush the fiber tissue of the radish residue. The rotation speed of the homogenizer is 12000 rpm / min, 20 s each time, with a gap of 30 s, for 10 consecutive times, to obtain a pulp with a beating degree of 55 °SR.

[0062] (4)Pulp blending: Input the pulp into the pulp blending tank through a pulp pump, add Abelmoschus manihot juice and clear water, and stir evenly. The dosage of Abelmoschus manihot juice is 30% of the weight of the radish residue. The stirring speed is 1000 rpm / min, and the stirring time is 30 min.

[0063] (5)Paper making: The prepared pulp flows into the paper making tank, and is further stirred to make the pulp evenly dispersed, and then run the paper machine to make paper. The amplitude of the shaking device in the wire part of the paper machine is 12 mm, and the oscillation frequency is 350 times / min. The pulp-to-wire speed ratio is 1.1.

[0064] (6)Extrusion: Stack the wet paper sheets made together with the mold, place them on the pressing position of the press, and extrude to dehydrate. The linear pressure of the press roll is 0.6 MPa.

[0065] (7)Drying: Use a conveyor belt to transfer the formed wet paper sheets to the drying device for drying, so that the dryness of the paper sheets reaches 96%. The drying of the drying device is divided into three sections. The temperature of the first section is 45 °C, the temperature of the second section is 60 °C, the temperature of the third section is 75 °C, the walking speed of the paper is 30 m / min, and the time is 40 s.

[0066] The tensile strength of the obtained carmine radish residue ecological paper is 5.5 MPa, the elongation at break is 7.8%, the folding endurance is 400 times, the whiteness is 34%, and the water content is 6%. Example

[0067] A method for making carmine radish residue ecological paper, comprising the following steps:

[0068] (1)Steaming: Put the waste carmine radish residue, pineapple leaf slices and 5% sodium hydroxide aqueous solution into the steaming equipment at a weight ratio of 1:0.2:8, heat to 130 °C and keep for 6 h, and then let the carmine radish residue and pineapple leaf fiber tissue enter the blow tank through the screw discharger.

[0069] (2)Washing: Add clear water for washing and suction filtration until the filtrate is colorless.

[0070] (3) Pulverization: Add water to the filter residue at a weight ratio of 1:2, and use a homogenizer to pulverize the fiber tissues of radish residue and pineapple leaves. The rotation speed of the homogenizer is 12000 rpm / min, for 20 s each time, with a 30 s interval, for 10 consecutive times, to obtain a pulp with a beating degree of 45° SR.

[0071] (4) Pulp blending: Input the pulp into the pulp blending tank through a pulp pump, add starfruit vine juice and clear water, and stir evenly. The dosage of starfruit vine juice is 30% of the weight of the radish residue. The stirring speed is 800 rpm / min, and the stirring time is 30 min.

[0072] (5) Paper making: The prepared pulp flows into the paper making tank, and is further stirred to evenly disperse the pulp, and then operate the paper machine to make paper. The amplitude of the shaking device in the wire section of the paper machine is 16 mm, and the oscillation frequency is 400 times / min. The pulp-to-wire speed ratio is 1.0.

[0073] (6) Extrusion: Stack the wet paper sheet made together with the mold, place it on the pressing position of the press, and extrude to dehydrate. The linear pressure of the press roll is 0.5 MPa.

[0074] (7) Drying: Use a conveyor belt to transfer the formed wet paper sheet to the drying device for drying, so that the dryness of the paper sheet reaches 95%. The drying of the drying device is divided into three stages. The temperature of the first stage is 40 °C, the temperature of the second stage is 55 °C, the temperature of the third stage is 70 °C, the walking speed of the paper is 40 m / min, and the time is 40 s.

[0075] The tensile strength of the ecological paper made from the rouge radish residue is 5.3 MPa, the elongation at break is 9.9%, the folding endurance is 380 times, the whiteness is 41%, and the water content is 6%. Example

[0076] A method for making ecological paper from rouge radish residue, comprising the following steps:

[0077] (1) Cooking: Put the waste rouge radish residue, bagasse, and 5% sodium hydroxide aqueous solution into the cooking equipment at a weight ratio of 1:1:10, heat to 120 °C and maintain for 8 h, and then the rouge radish residue and bagasse enter the blow tank through a screw discharger.

[0078] (2) Cleaning: Add clear water for washing and suction filtration until the filtrate is colorless.

[0079] (3) Pulverization: Add water to the filter residue at a weight ratio of 1:3, and use a homogenizer to pulverize the fiber tissue of the radish residue. The rotation speed of the homogenizer is 10000 rpm / min, for 20 s each time, with a 30 s interval, for 8 consecutive times, to obtain a pulp with a beating degree of 35° SR.

[0080] (4) Pulp blending: The pulp is pumped into the pulp blending tank, and bletilla striata pulp and clear water are added and stirred evenly. The dosage of bletilla striata pulp is 25% of the weight of radish residue. The stirring speed is 700 rpm / min, and the stirring time is 30 min.

[0081] (5) Papermaking: The prepared pulp flows into the papermaking tank and is further stirred to evenly disperse the pulp, and then the paper machine is operated for papermaking. The amplitude of the shaking device in the wire section of the paper machine is 14 mm, the oscillation frequency is 300 times / min, and the pulp-to-wire speed ratio is 1.1.

[0082] (6) Pressing: The wet paper sheet made and the mold are stacked together and placed on the pressing position of the press for squeezing and dewatering. The line pressure of the press roll is 0.6 MPa.

[0083] (7) Drying: The formed wet paper sheet is transported to the drying device by a conveyor belt for drying until the dryness of the paper sheet reaches 94%. The drying of the drying device is divided into three stages. The temperature of the first stage is 35 °C, the temperature of the second stage is 50 °C, the temperature of the third stage is 70 °C, the walking speed of the paper is 50 m / min, and the time is 20 s.

[0084] The tensile strength of the prepared ecological paper from rouge radish residue is 2.8 MPa, the elongation at break is 11.9%, the folding endurance is 90 times, the whiteness is 60%, and the water content is 7%. Example

[0085] A method for making ecological paper from rouge radish residue, comprising the following steps:

[0086] (1) Cooking: The waste rouge radish residue, bamboo chips, and 5% sodium hydroxide aqueous solution are put into the cooking equipment according to the weight ratio of 1:0.5:10, heated to 130 °C and maintained for 10 h, and then the rouge radish residue and bamboo chip residue enter the blow tank through a screw discharger.

[0087] (2) Cleaning: Add clear water for washing and suction filtration until the filtrate is colorless.

[0088] (3) Pulverizing: Water is added to the filter residue at a weight ratio of 1:3, and the radish residue fiber tissue is pulverized by a homogenizer. The rotation speed of the homogenizer is 12000 rpm / min, each time for 20 s, with a gap of 30 s, for 10 consecutive times, to obtain a pulp with a beating degree of 55 °SR.

[0089] (4) Pulp blending: The pulp is pumped into the pulp blending tank, and starfruit vine juice and clear water are added and stirred evenly. The dosage of starfruit vine juice is 30% of the weight of radish residue. The stirring speed is 1000 rpm / min, and the stirring time is 30 min.

[0090] (5)Sheet forming: The prepared pulp flows into the sheet forming pool and is further agitated to evenly disperse the pulp, and then the paper machine is operated for sheet forming. The amplitude of the shaking device in the wire section of the paper machine is 16 mm, and the oscillation frequency is 400 times / min. The pulp-to-wire speed ratio is 1.1.

[0091] (6)Pressing: The wet paper sheet formed together with the mold is stacked and placed on the pressing position of the press for dehydration by pressing. The linear pressure of the press roll is 0.6 MPa.

[0092] (7)Drying: The formed wet paper sheet is transported to the drying device by a conveyor belt for drying to make the dryness of the paper sheet reach 96%. The drying of the drying device is divided into three stages. The temperature of the first stage is 45 °C, the temperature of the second stage is 60 °C, and the temperature of the third stage is 75 °C. The traveling speed of the paper is 30 m / min and the time is 40 s.

[0093] The tensile strength of the prepared ecological paper from rouge radish residue is 3.9 MPa, the elongation at break is 10.3%, the folding endurance is 240 times, the whiteness is 57%, and the water content is 6%. Example

[0094] An ecological paper from rouge radish residue is prepared by using the discarded rouge radish residue as a raw material and adopting the production method of the ecological paper from rouge radish residue disclosed in the above example.

[0095] In summary, the present invention uses the discarded rouge radish residue after extracting anthocyanin as a raw material, treats it by the soda pulping method, crushes it by a homogenizer, sends it to a beater to make pulp with a beating degree of 30 - 55 °SR, and forms paper after pulp blending, preparing an ecological paper from rouge radish residue that meets various performance indicators, which can be used in the fields of calligraphy and painting, printing, packaging, etc., and is of great significance for the protection of the ecological environment and the full utilization of biomass resources.

[0096] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0097] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A method for making ecological paper from rouge radish residue, characterized in that, it includes the following steps: S1: Cooking: Put the waste rouge radish residue as raw material and 2 - 5% sodium hydroxide aqueous solution into the cooking equipment according to the weight ratio of 1:6 - 1:10, heat to 100 - 130 °C and maintain for 2 - 10 h, then the rouge radish residue enters the blow tank through a screw discharger; S2: Cleaning: Add clear water for washing and filtration by suction until the filtrate is colorless; S3: Crushing: Add water to the filter residue according to the weight ratio of 1:2 - 1:3, use a homogenizer to crush the fiber tissue of the rouge radish residue, the rotational speed of the homogenizer is 8000 - 12000 rpm / min, each time for 20 s, with an interval of 30 s, continuously for 5 - 10 times, to obtain a pulp with a beating degree of 30 - 55 °SR; S4: Pulp blending: Input the pulp into the pulp blending tank through a pulp pump, add plant gum and clear water, start the stirring device to stir evenly, the stirring speed is 700 - 1000 rpm / min, and the stirring time is 10 - 30 min; S5: Paper making: The prepared pulp flows into the paper making tank, stir further to make the pulp evenly dispersed, and operate the paper machine to make paper; the amplitude of the shaking device in the wire part of the paper machine is 8 - 16 mm, and the oscillation frequency is 100 - 400 times / min; The pulp - to - wire speed ratio is 0.9 - 1.1; S6: Extrusion: Stack the wet paper sheet made and the mold together, place them on the pressing position of the press, and extrude to dehydrate; the line pressure of the press roll is 0.2 - 0.6 MPa; S7: Drying: Use a conveyor belt to transport the formed wet paper sheet to the drying device for drying, so that the dryness of the paper sheet reaches 90 - 96%; And the walking speed of the paper is 10 - 50 m / min, and the time is 20 - 40 s.

2. The method for making ecological paper from rouge radish residue according to claim 1, characterized in that, the cooking equipment in S1 is an intermittent or continuous digester.

3. The method for making ecological paper from rouge radish residue according to claim 1, characterized in that, the dosage of the plant gum in S4 is 10 - 30% of the rouge radish residue, and the plant gum is kiwifruit vine juice, abelmoschus manihot juice, carambola vine juice or bletilla striata paste.

4. The method for making ecological paper from rouge radish residue according to claim 1, characterized in that, The specifications of the press felt fabric of the press in S6 are 800 - 1400 g / m 2 , and the mesh number is 70 - 90 meshes.

5. The method for making ecological paper from rouge radish residue according to claim 1, characterized in that, the drying by the drying device in S7 is divided into three stages, the temperature of the first stage is 30 - 45 °C, the temperature of the second stage is 50 - 60 °C, and the temperature of the third stage is 65 - 75 °C.

6. An ecological paper made from rouge radish residue, characterized in that, the ecological paper is prepared by using the method for making ecological paper from rouge radish residue according to any one of claims 1 - 5.