CN111979845A - Functional antibacterial wrapping paper for bean dreg dietary fiber - Google Patents
Functional antibacterial wrapping paper for bean dreg dietary fiber Download PDFInfo
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- CN111979845A CN111979845A CN202010905643.6A CN202010905643A CN111979845A CN 111979845 A CN111979845 A CN 111979845A CN 202010905643 A CN202010905643 A CN 202010905643A CN 111979845 A CN111979845 A CN 111979845A
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- dietary fiber
- bean dregs
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
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Abstract
The invention discloses functional antibacterial packaging paper for bean dreg dietary fiber, which comprises the following preparation processes: preparing wrapping paper, coating a waterproof agent and coating an antibacterial agent. The method comprises the steps of taking dietary fibers extracted from bean dregs as raw materials, washing and soaking the raw materials, crushing the raw materials, mixing the raw materials with water, carrying out ultrasonic treatment at the temperature of 35-55 ℃, adding glycerol, dextrin, dialdehyde starch and gum into feed liquid, uniformly stirring the mixture, carrying out compression molding, drying the mixture, and finally carrying out waterproof agent coating and antibacterial agent coating to obtain the functional antibacterial packaging paper for the bean dregs dietary fibers; the method has the advantages of simple operation, easily obtained raw materials and low cost, and the obtained paper is rich in dietary fibers; the waterproof layer and the antibacterial layer are both made of natural materials, so that the waterproof and antibacterial layer does not harm human bodies and the environment and has natural waterproof and antibacterial functions; compared with the traditional packaging paper, the tension and the humidity of the packaging paper are obviously enhanced, and the antibacterial effect is excellent; can be widely applied to the fields of fruits and vegetables, meat products, cakes, fast food and the like in the market as green packaging paper, and does not have the problems of secondary recovery and the like.
Description
Technical Field
The invention relates to the technical field of green materials, and particularly relates to functional antibacterial packaging paper for bean dreg dietary fibers.
Background
As is well known, China is a large country for producing and consuming soybeans, and a large amount of bean dregs of about 2000 million tons are produced while 6400 million tons of soybeans are processed and processed every year. However, the development and utilization degree of the bean dregs in China is low at present, most of wet bean dregs are used as feed or waste for treatment, resources are wasted, and the environment is polluted.
During the transportation, storage and sale of the food, the phenomena of bacteria contamination and spoilage are likely to occur, particularly the packaging of fruits and vegetables, and the relationship between the freshness and the packaging material is great. Some food antibacterial wrapping paper is coated with some synthetic antibacterial agents on the surface layer of the wrapping paper, and the food antibacterial wrapping paper is used for a long time and causes certain damage to human bodies in the process of killing bacteria. Moreover, the synthetic antimicrobial agents also cause bacterial resistance, the antimicrobial effect is gradually reduced, and then another antimicrobial agent must be replaced. Chitosan is a natural antibacterial material, so that the chitosan is widely concerned in the field of food, fruit and vegetable fresh-keeping.
As an important packaging material, the packaging paper is widely applied to product packaging in various industries and comprises a box paperboard, a corrugated base paper, a white paperboard, a soft beverage packaging paper, special packaging paper and the like. However, the raw materials of the traditional paper and paperboard mainly depend on wood pulp and straw pulp which take trees as raw materials, and the excessive dependence can cause a large amount of wood to be cut down, thereby causing water and soil loss, and simultaneously, the paper production brings a large amount of water resource pollution; in addition, the plain paper has no biological activity, such as antibacterial and antioxidant functions. Therefore, the functional antibacterial wrapping paper for the dietary fiber of the bean dregs is provided.
Disclosure of Invention
Technical problem to be solved
In order to overcome the defects of the prior art, the functional antibacterial wrapping paper for the bean dreg dietary fiber is provided, the bean dreg dietary fiber is used as a main raw material, and the wrapping paper is manufactured, so that the food safety problem is avoided, and the harmfulness is avoided; the additive added in the papermaking process is harmless, the paper is a green packaging product, the paper strength and the humidity of the edible paper are obviously enhanced, the edible paper is not easy to break, the paper is suitable for long-term placement, the operation is simple, the cost is low, the raw materials are easy to obtain, the application range of the obtained paper is wide, the waste recycling and the resource utilization are realized, and the product added value is improved.
(II) technical scheme
The invention is realized by the following technical scheme: the invention provides functional antibacterial packaging paper for bean dreg dietary fiber and a preparation method thereof, and is characterized by comprising the following specific steps:
step 1: extracting soluble dietary fiber of bean dregs: the method comprises the steps of taking bean dregs as raw materials, extracting bean dreg dietary fibers from the bean dregs by a biological enzymolysis method, washing and soaking the bean dregs, and crushing the bean dregs into 100-250 meshes.
Step 2: preparing feed liquid: mixing dietary fiber and water, carrying out ultrasonic treatment at the temperature of 35-55 ℃, adding 1-1.5% (w/v) of glycerol, 1.5-2% (w/v) of dextrin, 0.3-0.6% (w/v) of dialdehyde starch and 0.5-1% (w/v) of gum into the feed liquid, and uniformly stirring.
And step 3: and (3) pressing and forming: and (3) making the mixed feed liquid by using a screen with the mesh size of more than or equal to 100 meshes, pressing and forming, drying, and then carrying out waterproof agent coating and antibacterial agent coating to obtain the functional antibacterial packaging paper for the bean dreg dietary fiber.
Further, the bean dregs are dried, degreased, dried and extracted with dietary fiber by a biological enzymolysis method.
Further, the degreased dietary fiber is washed by clean water for 3-4 times and soaked in the clean water for 3-5 min.
Further, the crushed dietary fiber is mixed with water until the concentration of the feed liquid is 10-25% (w/v), and then the mixture is subjected to ultrasonic treatment for 5-8 min at 35-55 ℃ under the condition that the ultrasonic power is 300-600 w.
Further, the feed liquid is baked for 60-70 min at 100 ℃ after being pressed and formed, and then the paper is formed.
Further, the waterproof agent is prepared by adding water into cold-soluble cationic starch and preparing an aqueous solution with the mass concentration of 3-5%.
Further, the antibacterial agent is chitosan oligomer which is prepared into an aqueous solution with the mass concentration of 1% -1.5%, and the aqueous solution is coated on the inner layer of the packaging paper, wherein the coating quantity is 19-21 g/square meter.
Further, the coating is applied to the inner side of the packaging paper, and the coating weight is 20-25 g per square meter.
(III) advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
1. the bean dreg dietary fiber is used as the main raw material, and when the paper is used as the packaging paper, the problem of food safety does not exist, and the paper is harmless; and the additive added in the paper-making process has no harm, and is a green packaging product.
2. Compared with common packaging paper, the edible paper prepared by the method has obviously enhanced paper strength and humidity, is not easy to break and is suitable for long-term storage, and the used waterproof layer and the antibacterial layer are both made of natural materials, so that the edible paper does not harm human bodies and the environment and has natural waterproof and antibacterial functions.
3. The method has the advantages of simple operation, low cost, easily obtained raw materials, wide application range of the obtained paper, realization of waste recycling and resource utilization, and improvement of the added value of products.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments further describe the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The functional antibacterial wrapping paper for the bean dreg dietary fiber and the preparation method thereof are characterized by comprising the following specific steps: step 1: extracting soluble dietary fiber of bean dregs: taking bean dregs as a raw material, extracting bean dreg dietary fiber from the bean dregs by a biological enzymolysis method, washing and soaking the bean dregs, and crushing the bean dregs into 100-250 meshes; step 2: preparing feed liquid: mixing dietary fiber and water, carrying out ultrasonic treatment at the temperature of 35-55 ℃, adding 1-1.5% (w/v) of glycerol, 1.5-2% (w/v) of dextrin, 0.3-0.6% (w/v) of dialdehyde starch and 0.5-1% (w/v) of gum into the feed liquid, and uniformly stirring; and step 3: and (3) pressing and forming: and (3) making the mixed feed liquid by using a screen with the mesh size of more than or equal to 100 meshes, pressing and forming, drying, and then carrying out waterproof agent coating and antibacterial agent coating to obtain the functional antibacterial packaging paper for the bean dreg dietary fiber.
Wherein, the bean dregs are dried, degreased and dried again, and the dietary fiber is extracted from the bean dregs by a biological enzymolysis method; washing the degreased dietary fiber with clear water for 3-4 times, and soaking in the clear water for 3-5 min; mixing the crushed dietary fiber with water until the concentration of the feed liquid is 10-25% (w/v), and then carrying out ultrasonic treatment for 5-8 min at 35-55 ℃ under the condition that the ultrasonic power is 300-600 w; the feed liquid is pressed and molded, then is baked for 60min to 70min at 100 ℃, and the paper is molded; the waterproof agent is prepared by adding water into cold-soluble cationic starch and preparing an aqueous solution with the mass concentration of 3-5%; the antibacterial agent is an aqueous solution prepared from chitosan oligomer with the mass concentration of 1-1.5%, and is coated on the inner layer of the packaging paper, wherein the coating amount is 19-21 g/square meter; the coating is applied to the inner side of the packaging paper, and the coating weight is 20-25 g/square meter.
Example 1
The preparation method of the functional antibacterial wrapping paper for the bean dreg dietary fiber comprises the following specific operations:
(1) drying and degreasing bean dregs, drying again, extracting dietary fiber from the bean dregs by an enzyme method, drying the bean dregs at 100 ℃, sieving by a 120-mesh sieve, degreasing (degreasing refers to soaking the bean dregs for 8 hours by using ether with the volume of 8 times of that of the bean dregs), washing by using water to remove an organic solvent, and drying at 80 ℃; and (3) drying the bean dregs according to the mass ratio of 25: 1, adding pure water, adjusting the pH value of the solution to 6, adding 4% by mass of papain, carrying out water bath at 50 ℃, carrying out ultrasonic power of 150W, and carrying out synergistic enzymolysis for 60 min; and adjusting the pH value of the solution to 5, adding 1% of saccharifying enzyme by mass percent, carrying out water bath at 50 ℃, carrying out ultrasonic wave power of 200W, and carrying out synergistic enzymolysis for 40min to obtain the bean dreg dietary fiber.
(2) Washing the defatted dietary fiber with clear water for 3 times, soaking in clear water for 3min to moisten the fiber, and washing off residual metal ions.
(3) Pulverizing the bean dregs dietary fiber to 100 meshes.
(4) (4) mixing the crushed dietary fibers with water until the concentration of the feed liquid is 10% (W/v), and then carrying out ultrasonic treatment for 8min at 35 ℃ under the condition of ultrasonic power of 600W.
(5) Adding 1.5% (w/v) glycerol, 1.5% (w/v) dextrin, 0.5% (w/v) dialdehyde starch and 0.5% (w/v) gum into the feed liquid, stirring uniformly, conveying the mixed feed liquid to a paper making head box through a pulp flow system, papermaking by adopting a 200-mesh screen, spreading the mixed solution on the screen, pressing into paper with the thickness of 0.5mm, baking at 100 ℃ for 60min, and forming the bean dreg dietary fiber paper.
(6) Adding water into cold-soluble cationic starch to prepare an aqueous solution with the mass concentration of 3 percent, and coating the aqueous solution as a waterproof agent on the inner layer and the outer layer of the packaging paper, wherein the coating amount is 20 g/square meter.
(7) Preparing the chitosan oligosaccharide into an aqueous solution with the mass concentration of 1 percent, coating the aqueous solution as an antibacterial agent on the inner layer of the packaging paper at the coating weight of 19 g/square meter, and obtaining the functional antibacterial packaging paper for the dietary fiber of the bean dregs.
Example 2
The preparation method of the functional antibacterial wrapping paper for the bean dreg dietary fiber comprises the following specific operations:
(1) drying and degreasing bean dregs, drying again, extracting dietary fiber from the bean dregs by an enzyme method, drying the bean dregs at 100 ℃, sieving by a 100-mesh sieve, degreasing (degreasing refers to soaking the bean dregs for 5 hours by diethyl ether with the volume being 7 times that of the bean dregs), washing by water to remove an organic solvent, and drying at 100 ℃; and (3) drying the bean dregs according to the mass ratio of 25: 1, adding pure water, adjusting the pH value of the solution to 6, adding 4% by mass of papain, carrying out water bath at 50 ℃, carrying out ultrasonic power of 150W, and carrying out synergistic enzymolysis for 60 min; and adjusting the pH value of the solution to 5, adding 1% of saccharifying enzyme by mass percent, carrying out water bath at 50 ℃, carrying out ultrasonic wave power of 200W, and carrying out synergistic enzymolysis for 40min to obtain the bean dreg dietary fiber.
(2) Washing the defatted dietary fiber with clear water for 4 times, soaking in clear water for 4min to moisten the fiber, and washing off residual metal ions.
(3) Pulverizing the bean dreg dietary fiber to 150 meshes.
(4) Mixing the pulverized dietary fiber with water until the concentration of the feed liquid is 15% (W/v), and performing ultrasonic treatment at 55 deg.C and ultrasonic power of 300W for 5 min.
(5) Adding 1% (w/v) glycerol, 2% (w/v) dextrin, 0.3% (w/v) dialdehyde starch and 1.0% (w/v) gum into the feed liquid, stirring uniformly, conveying the mixed feed liquid to a paper making head box through a paper pulp flow system, manufacturing by adopting a 200-mesh screen, spreading the mixed solution on the screen, pressing into paper with the thickness of 0.2mm, baking at 100 ℃ for 65min, and forming the bean dreg dietary fiber paper.
(6) Adding water into cold-soluble cationic starch to prepare an aqueous solution with the mass concentration of 3 percent, and coating the aqueous solution as a waterproof agent on the inner layer and the outer layer of the packaging paper, wherein the coating quantity is 21 g/square meter.
(7) Preparing the chitosan oligosaccharide into an aqueous solution with the mass concentration of 1.2 percent, coating the aqueous solution serving as an antibacterial agent on the inner layer of the packaging paper at the coating weight of 19 g/square meter, and thus obtaining the functional antibacterial packaging paper for the dietary fibers of the bean dregs.
Example 3
The preparation method of the functional antibacterial wrapping paper for the bean dreg dietary fiber comprises the following specific operations:
(1) drying and degreasing bean dregs, drying again, extracting dietary fiber from the bean dregs by an enzyme method, drying the bean dregs at 100 ℃, sieving by a 80-mesh sieve, degreasing (degreasing refers to soaking the bean dregs for 10 hours by using diethyl ether with the volume 5 times of that of the bean dregs), washing by using water to remove an organic solvent, and drying at 100 ℃; and (3) drying the bean dregs according to the mass ratio of 25: 1, adding pure water, adjusting the pH value of the solution to 6, adding 4% by mass of papain, carrying out water bath at 50 ℃, carrying out ultrasonic power of 150W, and carrying out synergistic enzymolysis for 60 min; and adjusting the pH value of the solution to 5, adding 1% of saccharifying enzyme by mass percent, carrying out water bath at 50 ℃, carrying out ultrasonic wave power of 200W, and carrying out synergistic enzymolysis for 40min to obtain the bean dreg dietary fiber.
(2) Washing the defatted dietary fiber with clear water for 4 times, soaking in clear water for 5min to moisten the fiber, and washing off residual metal ions.
(3) The bean dregs dietary fiber is crushed to the granularity of 250 meshes.
(4) Mixing the pulverized dietary fiber with water until the concentration of the feed liquid is 25% (W/v), and performing ultrasonic treatment at 45 deg.C and ultrasonic power of 450W for 6 min.
(5) Adding 1.2% (w/v) of glycerol, 1.7% (w/v) of dextrin, 0.6% (w/v) of dialdehyde starch and 0.8% (w/v) of gum into the feed liquid, stirring uniformly, conveying the mixed feed liquid to a paper making head box through a pulp flow system, papermaking by adopting a 300-mesh screen, spreading the mixed solution on the screen, pressing into paper with the thickness of 0.2mm, baking at 100 ℃ for 70min, and forming the bean dreg dietary fiber paper.
(6) Adding water into cold-soluble cationic starch to prepare an aqueous solution with the mass concentration of 3 percent, and coating the aqueous solution as a waterproof agent on the inner layer and the outer layer of the packaging paper, wherein the coating quantity is 21 g/square meter.
(7) Preparing the chitosan oligosaccharide into an aqueous solution with the mass concentration of 1.1 percent, coating the aqueous solution as an antibacterial agent on the inner layer of the packaging paper, wherein the coating amount is 19 g/square meter, and obtaining the functional antibacterial packaging paper for the dietary fiber of the bean dregs.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (8)
1. The functional antibacterial wrapping paper for the bean dreg dietary fiber and the preparation method thereof are characterized by comprising the following specific steps:
step (1): extracting soluble dietary fiber of bean dregs: the method comprises the steps of taking bean dregs as raw materials, extracting bean dreg dietary fibers from the bean dregs by a biological enzymolysis method, washing and soaking the bean dregs, and crushing the bean dregs into 100-250 meshes.
Step (2): preparing feed liquid: mixing dietary fiber and water, carrying out ultrasonic treatment at the temperature of 35-55 ℃, adding 1-1.5% (w/v) of glycerol, 1.5-2% (w/v) of dextrin, 0.3-0.6% (w/v) of dialdehyde starch and 0.5-1% (w/v) of gum into the feed liquid, and uniformly stirring.
And (3): and (3) pressing and forming: and (3) making the mixed feed liquid by using a screen with the mesh size of more than or equal to 100 meshes, pressing and forming, drying, and then carrying out waterproof agent coating and antibacterial agent coating to obtain the functional antibacterial packaging paper for the bean dreg dietary fiber.
2. The functional antibacterial wrapping paper for the dietary fiber of the bean dregs, as claimed in claim 1, is characterized in that: and drying and degreasing the bean dregs, drying, and extracting dietary fiber from the bean dregs by a biological enzymolysis method.
3. The functional antibacterial wrapping paper for the dietary fiber of the bean dregs, as claimed in claim 1, is characterized in that: and washing the degreased dietary fiber with clear water for 3-4 times, and soaking in the clear water for 3-5 min.
4. The functional antibacterial wrapping paper for the dietary fiber of the bean dregs, as claimed in claim 1, is characterized in that: the crushed dietary fiber is mixed with water until the concentration of the feed liquid is 10-25% (w/v), and then the mixture is subjected to ultrasonic treatment for 5-8 min at the temperature of 35-55 ℃ and the ultrasonic power of 300-600 w.
5. The functional antibacterial wrapping paper for the dietary fiber of the bean dregs, as claimed in claim 1, is characterized in that: and after the material liquid is pressed and formed, the material liquid is baked for 60-70 min at 100 ℃, and the paper is formed.
6. The functional antibacterial wrapping paper for the dietary fiber of the bean dregs, as claimed in claim 1, is characterized in that: the waterproof agent is prepared by adding water into cold-soluble cationic starch and preparing an aqueous solution with the mass concentration of 3-5%.
7. The functional antibacterial wrapping paper for the dietary fiber of the bean dregs, as claimed in claim 1, is characterized in that: the antibacterial agent is an aqueous solution prepared from chitosan oligomer with the mass concentration of 1-1.5%, and is coated on the inner layer of the packaging paper, wherein the coating amount is 19-21 g/square meter.
8. A water repellent according to claim 6, characterized in that: the coating is coated on the inner side of the packaging paper, and the coating weight is 20-25 g/square meter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010905643.6A CN111979845A (en) | 2020-09-01 | 2020-09-01 | Functional antibacterial wrapping paper for bean dreg dietary fiber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010905643.6A CN111979845A (en) | 2020-09-01 | 2020-09-01 | Functional antibacterial wrapping paper for bean dreg dietary fiber |
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| CN111979845A true CN111979845A (en) | 2020-11-24 |
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| CN202010905643.6A Pending CN111979845A (en) | 2020-09-01 | 2020-09-01 | Functional antibacterial wrapping paper for bean dreg dietary fiber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113632830A (en) * | 2021-08-18 | 2021-11-12 | 四川农业大学 | Portable preservation card with deltamethrin adsorption and antibacterial properties and preparation method thereof |
| CN113912891A (en) * | 2021-11-10 | 2022-01-11 | 衢州学院 | Preparation process of degradable preservative paper |
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| US20060251789A1 (en) * | 2002-11-06 | 2006-11-09 | Fiberstar, Inc. | Novel dairy product compositions using highly refined cellulosic fiber ingredients |
| CN102517974A (en) * | 2011-12-28 | 2012-06-27 | 昆明理工大学 | Method for preparing soybean curb residue dietary fiber edible paper |
| CN105113332A (en) * | 2015-08-13 | 2015-12-02 | 合肥龙发包装有限公司 | Antibacterial packaging paper |
| CN109385100A (en) * | 2018-11-21 | 2019-02-26 | 四川农业大学 | A kind of preparation method of bean dregs dietary fiber edible packaging composite membrane |
| CN109504113A (en) * | 2018-11-21 | 2019-03-22 | 四川农业大学 | A kind of preparation method of bean dregs environmental protection food tableware |
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2020
- 2020-09-01 CN CN202010905643.6A patent/CN111979845A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060251789A1 (en) * | 2002-11-06 | 2006-11-09 | Fiberstar, Inc. | Novel dairy product compositions using highly refined cellulosic fiber ingredients |
| CN102517974A (en) * | 2011-12-28 | 2012-06-27 | 昆明理工大学 | Method for preparing soybean curb residue dietary fiber edible paper |
| CN105113332A (en) * | 2015-08-13 | 2015-12-02 | 合肥龙发包装有限公司 | Antibacterial packaging paper |
| CN109385100A (en) * | 2018-11-21 | 2019-02-26 | 四川农业大学 | A kind of preparation method of bean dregs dietary fiber edible packaging composite membrane |
| CN109504113A (en) * | 2018-11-21 | 2019-03-22 | 四川农业大学 | A kind of preparation method of bean dregs environmental protection food tableware |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113632830A (en) * | 2021-08-18 | 2021-11-12 | 四川农业大学 | Portable preservation card with deltamethrin adsorption and antibacterial properties and preparation method thereof |
| CN113632830B (en) * | 2021-08-18 | 2023-04-25 | 四川农业大学 | Portable fresh-keeping card with deltamethrin adsorption and antibacterial properties and preparation method thereof |
| CN113912891A (en) * | 2021-11-10 | 2022-01-11 | 衢州学院 | Preparation process of degradable preservative paper |
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