A manufacturing method of plastic-free traditional Chinese medicine packaging paper containing traditional Chinese medicine ingredients and its upstream and downstream processes

Abstract

The application provides a manufacturing method of plastic-free traditional Chinese medicine packaging paper containing traditional Chinese medicine ingredients and upstream and downstream processes thereof, and belongs to the technical field of packaging paper manufacturing and processing. The method comprises fiberization treatment of woody traditional Chinese medicine plants and extraction of active ingredients, modification processing of wood chemical pulp, preparation of a special water-based coating for traditional Chinese medicine packaging paper, papermaking of traditional Chinese medicine packaging paper base paper, and coating processing of traditional Chinese medicine packaging paper. In terms of paper structure, it comprises a fiber layer base paper and a functional coating layer. In terms of technology, the base paper involves mechanical low-temperature extraction of active ingredients from woody traditional Chinese medicine plants, perfusion and solidification of traditional Chinese medicine active ingredients in plant fiber channels, and the coating involves a plastic-free formula and processing method. Through the innovative construction of the base paper fibers and the coating, the application endows the paper with special properties such as antibacterial, insect-proof, moisture-proof, water-resistant, high air permeability and the like without using plastics and chemicals.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packaging paper manufacturing process, in particular to a manufacturing method of a plastic-free traditional Chinese medicine packaging paper containing traditional Chinese medicine ingredients and its upstream and downstream processes. BACKGROUND

[0002] Generally, packaging paper is a material widely used for product packaging, which is generally made of plant fibers and various chemicals. Packaging paper for different products and different application scenarios has specific needs in terms of physical strength, moisture resistance, water resistance, oil resistance, oxidation resistance, and oxygen and air barrier. In order to meet these needs, there are great differences in the selection of plant fibers and the addition of chemicals. First, in terms of plant fibers, according to pulping technology, it is divided into chemical pulp fiber, mechanical pulp fiber and chemical-mechanical pulp fiber. The characteristic of chemical pulp is that the lignin of the plant is removed, the fiber purity is high, and the fiber flexibility is high. According to the different wood, the chemical pulp fiber is divided into needle leaf chemical pulp fiber and broad leaf chemical pulp fiber. The needle leaf chemical pulp fiber is relatively long, the fiber is relatively thick, and the fiber cavity is large. The broad leaf fiber is relatively short, the fiber is relatively thin, and the cavity volume is small. Mechanical pulp generally uses grinding disc to crush the plant, without lignin removal, only plant fiberization, and the characteristic is low strength without so-called fiber cavity.

[0003] Papermaking chemicals include many categories, which can be divided into chemicals added in the pulp and chemicals coated on the surface of the paper. Internal sizing agent and reinforcing agent are added in the pulp, and surface sizing agent and coating belong to the use on the surface of the paper. Starch and modified starch are the most commonly used sizing agents, which can be used in the pulp and on the surface of the paper. With the improvement of the performance requirements of paper, synthetic AKD (alkyl ketene dimer) and ASA (alkenyl succinic anhydride), PVA (polyvinyl alcohol) sizing agents are widely used. The reinforcing agent added in the pulp mainly improves the dry strength and wet strength of the paper, including polyacrylamide, urea-formaldehyde resin, melamine resin, polyethyleneimine and polyamide epichlorohydrin. Coating belongs to paper processing chemicals, and coating can endow the paper with many properties, such as water resistance and oil resistance. The binder of these coatings is latex, such as styrene-butadiene latex, styrene-acrylate latex, polyvinyl acetate latex and acrylic latex. In summary, synthetic papermaking chemicals are widely used. These resins, latexes and plastic particles not only exist between the fibers of the paper, but also exist in the layer on the surface of the paper. The use of such plastic-containing paper in the fields of food, medicine and agriculture has great safety hazards. Therefore, it is necessary to develop and use plastic-free paper in specific fields.

[0004] For paper specially used for packaging traditional Chinese medicine, there are few effective invention patents. Chinese patent CN202011279703 discloses a traditional Chinese medicine particle packaging bag and a preparation method thereof, the main raw material of which is low-density polyethylene, and the forming method is blow molding. Chinese patent CN202011279679 discloses a mildew-proof type traditional Chinese medicine beverage packaging bag and a processing method thereof, which adopts a polymer and maleic anhydride grafted polyethylene, and the forming method is melt flow casting film. Traditional Chinese medicine packaging paper includes paper bag paper, which can be used to hold Chinese herbal medicine and Chinese patent medicine particles. Chinese patent CN202110782505 discloses a manufacturing method of high-air-permeability paper bag paper, the characteristics of which are the press section and pressure setting of the paper machine. Chinese patent CN202210584111 discloses a high-air-permeability stretch paper bag paper and a preparation method thereof, the characteristics of which are the specific pressure control of the pulp in the beating process to regulate the air permeability of the paper bag paper. Chinese patent CN202111683227 discloses a waterproof and oil-proof paper bag paper that can be recycled and utilized, a preparation method thereof, and an environmental protection bag, which mainly prepares an acrylic emulsion for the waterproof layer and the oil-proof layer.

[0005] With the emphasis on health, traditional Chinese medicine packaging paper and paper bag paper are beginning to be plastic-free. The anti-insect, waterproof, oil-proof, moisture-proof and anti-microbial abilities of plastic-free paper materials are weak, and some functional additives and agents are generally needed to be added. The functional additives are mainly waterproof, oil-proof and moisture-proof, and the agents are mainly for insect prevention and microbial prevention. The health and safety of functional additives and agents need to be further investigated. SUMMARY

[0006] The technical task of the present application is to solve the deficiencies of the prior art and provide a manufacturing method of plastic-free traditional Chinese medicine packaging paper containing traditional Chinese medicine ingredients and its upstream and downstream processes. The additives required are all derived from plants or organisms, and the agents required are derived from Chinese herbal medicine, so the health and safety level of traditional Chinese medicine packaging paper and paper bag paper is undoubtedly further improved.

[0007] The technical solution of the present application is implemented in the following manner. The manufacturing method of plastic-free traditional Chinese medicine packaging paper containing traditional Chinese medicine ingredients and its upstream and downstream processes of the present application are as follows:

[0008] The method for fiberizing and extracting active ingredients of a woody traditional Chinese medicine plant of the present application comprises the following steps:

[0009] Step 1: Soaking: A multi-element weak acid strong alkali salt solution is used to soak the crushed woody traditional Chinese medicine plant, an antioxidant is added to the soaking system, and the amount of weak acid strong alkali salt is controlled so that the terminal pH of the soaking liquid is in the range of 7.0-9.6;

[0010] The wood traditional Chinese medicine plants include but are not limited to the wood traditional Chinese medicine plants rich in high-fat pectin, rich in tannin and flavonoids, rich in lignans, rich in terpenes and glycosides, rich in nicotine, and rich in alkaloids;

[0011] Step 2 mechanical fiberization treatment: mechanical fiberization treatment of the traditional Chinese medicine plants after soaking, a multi-pass pulping process is adopted, and the gap of the final pass pulping is less than 2-5 mu m of the width of the traditional Chinese medicine plant fibers, so that the purpose of completely releasing the traditional Chinese medicine ingredients is achieved;

[0012] Step 3 extrusion filtration: the pulp is extruded to obtain mechanical traditional Chinese medicine plant fibers and filtrate containing traditional Chinese medicine active ingredients, and the hydroxyl and carboxyl groups of the traditional Chinese medicine active ingredients in the filtrate are ionized under weak alkaline conditions to be dissolved in the form of sodium salt.

[0013] The method comprises the following steps:

[0014] Step 2.1: screening of chemical pulp fibers:

[0015] The commercial chemical pulp is selected as the raw material, the fibers with a length less than 0.25 mm are screened out by using a 60-mesh sieve, and the pulp with a length higher than 0.25 mm is collected for use;

[0016] Step 2.2: defibration and dispersion of the chemical pulp:

[0017] The defibration concentration is 5%-10%, and the water for defibration is the filtrate obtained in step 3 of the wood traditional Chinese medicine plant fiberization treatment and active ingredient extraction method according to claim 1;

[0018] Step 2.3: introduction of traditional Chinese medicine ingredients into the fiber cell cavity:

[0019] The uniformly defibrated and dispersed pulp is introduced into a micro-jet high-pressure homogenizer for treatment, the air in the fiber cell cavity is driven out through the pressure change in the high-pressure homogenizer, and the traditional Chinese medicine ingredients are introduced into the fiber cell cavity;

[0020] Step 2.4: fixing of the traditional Chinese medicine ingredients in the fiber cell cavity of the chemical pulp by precipitation:

[0021] The pulp out of the homogenizer is added with a fixing agent to fix the traditional Chinese medicine ingredients in the cavity, the fixing agent is a soluble calcium salt solution or an iron solution; the amount of calcium / iron ions is equal to the total amount of anions in the system in stoichiometry; the material is stirred to make the traditional Chinese medicine active ingredients containing carboxyl and hydroxyl groups react with the calcium / iron ions to generate a precipitate, and the anions in the system react with the calcium / iron ions to generate a precipitate, so as to block the cell cavity of the chemical pulp;

[0022] Step 2.5: physical blocking of the traditional Chinese medicine in the fiber cell cavity of the chemical pulp:

[0023] The slurry from the homogenizer is added to the plant fiber of the wood medicine plant in step 2 of the fiber treatment and active ingredient extraction method of the wood medicine plant according to claim 1; after stirring and dispersing uniformly, the material is again introduced into the micro-jet high-pressure homogenizer for treatment, and the plant particles are introduced into the fiber cell cavity through the pressure change in the high-pressure homogenizer, so as to realize physical plugging;

[0024] The modified chemical pulp is obtained.

[0025] The preparation method of the water-based coating for the traditional Chinese medicine packaging paper according to the present application uses the following formula:

[0026] The water-soluble component of the coating uses the pulp grinding process liquid in step 2 of the fiber treatment and active ingredient extraction method of the wood medicine plant according to claim 1;

[0027] The water-insoluble component of the coating comprises high-ester pectin, rosin, wax, dry vegetable oil, and terpenes;

[0028] The natural emulsifier for the coating comprises but is not limited to lecithin, lanolin, beeswax, and sodium lignosulfonate;

[0029] The water-insoluble component of the coating comprises high-ester pectin (2-5 wt%), rosin (2-5 wt%), wax (2-10 wt%), dry vegetable oil (20-50 wt%), and terpenes (0.01-0.2 wt%);

[0030] The natural emulsifier for the coating (2-5 wt%);

[0031] The water-soluble component of the coating: pulp grinding process liquid (supplemented to 100%);

[0032] The method comprises the following steps: under the condition of air-tightness or air isolation, the water-soluble component, the water-insoluble component, and the natural emulsifier are prepared into the water-based coating for the traditional Chinese medicine packaging paper by using high-speed shearing or micro-jet.

[0033] The method for making the base paper of the traditional Chinese medicine packaging paper according to the present application comprises the following steps:

[0034] Step 4.1: raw materials

[0035] The fiber of the base paper (1) comprises unmodified chemical pulp fiber;

[0036] The raw material (2) is the mechanical method medicine plant fiber pulp grinding liquid in step 2 of the fiber treatment and active ingredient extraction method of the wood medicine plant according to claim 1;

[0037] The raw material (3) is the modified chemical pulp obtained by the modification processing method of the wood chemical pulp according to claim 2.

[0038] Step 4.2: raw material treatment:

[0039] Raw material (1) and raw material (2) are separately pulped, and raw material (3) is slightly pulped or not pulped;

[0040] Step 4.3: After mixing the treated raw materials (1), (2) and (3) in the previous step, they are fed into the paper machine, and the dilution of pulp fibers uses the filtrate in step 3 of the fiberization treatment and active ingredient extraction method of a wooden traditional Chinese medicine plant as claimed in claim 1, and the process water (white water) of the paper machine is closed-circulated;

[0041] The traditional Chinese medicine packaging paper base paper is obtained.

[0042] 5, a coating processing method of traditional Chinese medicine packaging paper, characterized in that the method is:

[0043] Step 5.1: The raw material is the traditional Chinese medicine packaging paper base paper obtained by the papermaking method of claim 4, and after the base paper is dehydrated and dried, the special water-based coating for traditional Chinese medicine packaging paper obtained by the preparation method of claim 3 is used for coating;

[0044] Step 5.2: The coating is dried into a film by using infrared radiation or non-contact hot air;

[0045] Step 5.3: Inorganic particles are sprayed on the surface of the coating before the paper is curled, and the amount of inorganic particle spraying is 10-20 g / m 2 .

[0046] Based on the above process method, the manufacturing method of traditional Chinese medicine packaging paper with moisture resistance, the manufacturing method of plastic-free traditional Chinese medicine packaging paper with bacteria and insect resistance, and the manufacturing method of high-air-permeability traditional Chinese medicine packaging paper with tea aroma are extended.

[0047] Compared with the prior art, the beneficial effects of the present application are:

[0048] The manufacturing method of plastic-free traditional Chinese medicine packaging paper containing traditional Chinese medicine ingredients and its upstream and downstream processes, in terms of paper structure, include a fiber layer base paper and a functional coating layer. In terms of technology, the base paper involves mechanical low-temperature extraction of active ingredients from wooden traditional Chinese medicine plants, perfusion and solidification of traditional Chinese medicine active ingredients in plant fiber cavities, and the coating layer involves plastic-free formula and processing method.

[0049] The present application innovatively constructs the base paper fiber and the coating layer, and gives the paper special properties such as antibacterial, insect prevention, moisture resistance, water resistance, high air permeability and the like without using plastic and chemicals.

[0050] The manufacturing method of the plastic-free Chinese medicine packaging paper containing Chinese medicine ingredients of the present invention and its upstream and downstream process designs are reasonable, the process is safe and reliable, the use is convenient, and large-scale production is easy, and the promotion and use value is very good. DETAILED DESCRIPTION

[0051] The following is a detailed description of the method for manufacturing a plastic-free Chinese medicine packaging paper containing Chinese medicine ingredients of the present invention.

[0052] Embodiment (I) The present invention first relates to a method for extracting active ingredients from woody Chinese medicinal plant materials and preparing mechanical fibers, which is characterized by comprising the following steps:

[0053] S1.1. The raw materials for woody Chinese medicinal materials are plants rich in Chinese medicinal ingredients and containing cellulose, including but not limited to: cotton stalks, vitex gracile, peach trees, apricot trees rich in high-fat pectin; persimmon trees, lacquer trees, paper mulberry trees, orange trees, oak trees, and mulberry trees rich in tannins and flavonoids; cassia wood, Millettia reticulata, Allium spatholobi, and Eucommia ulmoides trees rich in lignans, terpenes, and glycosides; tobacco straw rich in nicotine; and tea trees, camptotheca acuminata, Cephalotaxus fortunei, and Pinus koraiensis trees rich in alkaloids.

[0054] S1.2. Mechanically crush the plants until the length and width of the crushed materials are less than 5mm. Add polybasic weak acid and strong base salt solutions such as sodium carbonate, sodium oxalate, and sodium phosphate. The amount of weak acid and strong base salts used is 2-6% of the mass of the Chinese medicinal plant. Soak the plants. The mass ratio of solution to plant is 3:1~5:1. The soaking temperature is 15-45℃ and the soaking time is 30-120 minutes. Add vitamin A\C antioxidants to the soaking system to prevent oxidation of active substances.

[0055] S1.3. After soaking, the Chinese medicinal plants are wet-refined multiple times to varying finenesses. The preferred method is to use a double-disc mill for three refining cycles, with the disc spacings ranging from 800 to 500 μm, 400 to 100 μm, and 40 to 15 μm, respectively. During these multiple refining cycles, the spacing between the discs in the final refining cycle is related to the size of the Chinese medicinal plant fibers; the preferred spacing is 2 to 5 μm greater than the width of the Chinese medicinal plant fibers. The refining concentrations (mass of solid material / total mass of material and water) are 15 to 10%, 10 to 6%, and 6 to 2%, respectively. The preferred refining concentration is one that maintains a grinding zone temperature below 60°C.

[0056] S1.4. Extruding the slurry to obtain mechanically produced Chinese medicinal plant fibers and a filtrate containing active ingredients of the Chinese medicinal herbs. The hydroxyl and carboxyl groups of the active ingredients of the Chinese medicinal herbs in the filtrate are ionized under weakly alkaline conditions and dissolved in the form of sodium salts.

[0057] The above-mentioned method for extracting active ingredients of traditional Chinese medicine has undergone innovative design in terms of material selection, chemical use, process parameters, process environment, etc. First, conventional traditional Chinese medicine extraction is decoction, which is suitable for grass plants. The purpose of adding chemicals in the present invention is to destroy polysaccharides such as pectin and chitin in woody plants and improve the extraction rate. Secondly, in terms of process parameters, by controlling the temperature below 60°C, the degradation and denaturation of traditional Chinese medicine ingredients are reduced. The control of mechanical refining concentration reduces the high temperature generated by frictional heat by reducing the concentration, thereby reducing the degradation and denaturation of traditional Chinese medicine ingredients. The present invention mainly adopts low-concentration refining, and the maximum temperature of the grinding zone is controlled below 60°C, which can avoid the degradation of traditional Chinese medicine ingredients at high temperatures. This is different from the CTMP and APMP processes in the pulping industry. The specific differences are shown in Table 1.

[0058] Table 1 Relationship between refining concentration and grinding zone temperature

[0059] .

[0060] * BCTMP is bleached chemithermomechanical pulp, APMP is alkaline peroxide mechanical pulp.

[0061] The mechanical fiber preparation method of the Chinese medicinal plant in the present invention is different from the current conventional CTMP, BCTMP, and APMP in terms of process, process parameters, and chemicals, as shown in Table 2.

[0062] Table 2 Differences between the preparation process of woody Chinese medicinal plant fibers and the industrial CTMP, BCTMP, and APMP processes

[0063] .

[0064] * CTMP is chemithermomechanical pulp, BCTMP is bleached chemithermomechanical pulp, and APMP is alkaline peroxide mechanical pulp.

[0065] In addition to flavonoids and polyphenols, Chinese medicinal plants also contain polysaccharides such as pectin, gum arabic, gum tragacanth, guar gum, and agar. The hydroxyl groups of these polysaccharides are often acetylated, as in high-ester pectin. This makes these polysaccharides difficult to dissolve in water. Furthermore, the active ingredients of Chinese medicinal herbs, such as flavonoids and polyphenols, are encapsulated by these polysaccharides within plant tissues, making them equally difficult to dissolve. Our laboratory research, based on screening numerous alkaline chemicals, has revealed that polybasic weak acid and strong base salt solutions can hydrolyze acetylated polysaccharides, dissolving them and releasing the active ingredients of the Chinese medicinal herbs. The experimental data are shown in Table 3. Clearly, sodium oxalate achieves polysaccharide extraction rates exceeding 80%, significantly higher than those obtained with sodium hydroxide. Polysaccharide dissolution facilitates the exposure of polyphenols, which is why sodium oxalate is superior to sodium hydroxide in extracting polyphenols.

[0066] Table 3 Relationship between sodium oxalate dosage and cotton stalk pectin dissolution

[0067] .

[0068] Embodiment (two), the present application provides a method for modifying softwood chemical pulp, the purpose of modification is to introduce the cost of traditional Chinese medicine into the pulp fiber and fix, technical scheme is to use microjet high pressure homogenization method to fill, precipitation method or physical plugging method to fix, its characteristics include the following steps:

[0069] S2.1 screening of chemical pulp fibers: select commercial chemical pulp as raw material, the selected chemical pulp fiber diameter is 25-75 μm, the fiber cavity wall thickness is 2-5 μm. 10~100 mesh sieve is used to screen out the fibers with length less than 0.15 mm. Preferably, 60 mesh sieve is used to screen out the fibers with length less than 0.25 mm, and the paper pulp with length higher than 0.25 mm is collected for use.

[0070] S2.2 dispersing chemical pulp: the dispersing concentration is 5-10%, the dispersing water is the liquid medicine containing traditional Chinese medicine components, the concentration is 100 mg / L-1000 mg / L, preferably, the dispersing water is the filtrate in claim 1.

[0071] S2.3 introducing traditional Chinese medicine components into chemical pulp fiber cells: the uniformly dispersed pulp is treated by microjet high pressure homogenizer, the cavity diameter is selected as 300±100 μm, the pressure is selected as 150±50 Mpa, the air in the fiber cell cavity is driven out by the pressure change in the high pressure homogenizer, and the traditional Chinese medicine components are introduced into the fiber cell cavity.

[0072] S2.4 fixing traditional Chinese medicine in chemical pulp fiber cells by precipitation method: the pulp from the homogenizer is added with soluble calcium salt solution such as calcium chloride, calcium hydrogen phosphate, calcium nitrate and calcium gluconate, or iron sulfate, ferric chloride and ferric nitrate solution. The amount of calcium ions or iron ions is equal to the total amount of anions (carbonate, oxalate, phosphate, hydroxyl and carboxyl) in the system in stoichiometric amount. Stir the material, so that the active components of traditional Chinese medicine containing carboxyl and hydroxyl react with calcium / iron ions to generate precipitate, and the carbonate, oxalate and phosphate in the system react with calcium / iron ions to generate precipitate, so as to achieve the purpose of plugging the cell cavity of chemical pulp.

[0073] S2.5 Physical method to block the Chinese medicine in the fiber cell lumen: the pulp from the homogenizer, add 20-40wt% of the pulp solid of plant particles, the particle size of the plant particles is 20-60 μm, and the plant particles are sawdust after screening. Preferably, the plant particles are the mechanical method Chinese medicine plant fiber in claim 1. After stirring and dispersing uniformly, the material is treated again by the micro-jet high-pressure homogenizer, the lumen diameter is selected to be 300±100 μm, and the pressure is selected to be 250±50 Mpa. The plant particles are introduced into the fiber cell lumen by the pressure change inside the high-pressure homogenizer, and physical blocking is realized.

[0074] The active ingredients of Chinese medicine are water-soluble and can be filled into the lumen of plant fibers, but the filling amount is related to the size of the fiber. The thicker and longer the fiber is, the larger the lumen space is, and the more the storage amount of Chinese medicine ingredients is. If the fiber is very thick but short, the filled Chinese medicine is easy to lose. Therefore, long fibers are required. The laboratory studies the relationship between fiber screening and the retention amount of medicine in the lumen. The commercial pine chemical pulp is selected, and the 40 mesh, 60 mesh, 80 mesh, 100 mesh, 160 mesh and 200 mesh screens in Table 4 are used to screen the retained fibers, which are used as the carrier of Chinese medicine. Tannin is selected as a simulation of plant polyphenol. After filling tannin by using a high-pressure homogenizer, the fiber pulp is placed in a Buchner funnel, filtered on filter paper to form a filter layer, and then the filter layer is washed by using 100 times the mass of water of the fiber. Then, by measuring the amount of tannin in the filtrate and the amount of tannin originally added, the proportion of retained tannin in the fiber is calculated, and the results are shown in Table 4.

[0075] Table 4 Relationship between fiber screening mesh and tannin fixation efficiency

[0076] .

[0077] In addition, the screening of fibers also has an important relationship with the performance of paper. The paper used for packaging Chinese herbal medicine, especially when the Chinese herbal medicine is not completely dried, requires high air permeability of the packaging paper bag to prevent the Chinese herbal medicine from mildewing and rotting. For the processed Chinese medicine particles which have been completely dried, the paper packaging bag requires very low air permeability to avoid moisture from entering. Therefore, the air permeability of paper needs to be controlled, and an important means is the screening of fiber length. The paper with long and thick fibers has excellent air permeability, while the paper with short and thin fibers, especially after beating treatment, has greatly reduced air permeability. The commercial pine chemical pulp is screened in the laboratory, and the fibers larger than the screen hole size are used to make paper samples with a basis weight of 80 g / m 2 The air permeability and moisture permeability of the paper samples are measured by using the Schopper air permeability, and the results are shown in Table 5. The results show that the air permeability and moisture permeability of the base paper are closely related to the length of the fiber. The longer the fiber is, the higher the air permeability and moisture permeability are, and the shorter the fiber is, the lower the air permeability and moisture permeability of the paper are.

[0078] Table 5. Relationship between fiber size and paper air permeability, moisture barrier

[0079] .

[0080] After the active ingredients of traditional Chinese medicine are introduced into the cavities of chemical pulp fibers, the traditional Chinese medicine components are still soluble. In the subsequent papermaking process, there is a pressing dewatering step. The pressing dewatering will cause the traditional Chinese medicine components in the cavities to flow out and be lost under the action of pressure. Therefore, the traditional Chinese medicine components in the cavities of chemical pulp fibers must be fixed. The present patent designs the use of precipitation method and particle blocking method for fixation. The precipitation method uses a fixing agent. Again taking tannin as an example, calcium chloride, calcium dihydrogen phosphate, calcium nitrate, calcium gluconate and other calcium salts are added to the pulp, or iron sulfate, ferric chloride and ferric nitrate solutions are added. These divalent metal ions act as fixing agents and will form precipitated particles with tannin to block the fiber cavities and further fix the traditional Chinese medicine components. The addition of calcium ions will also react with sodium carbonate in the system to form calcium carbonate. The addition of iron ions will not only form iron hydroxide flocculation, but also will complex with tannin to form insoluble substances, thereby fixing tannin in the fiber cavities. Similarly, if the alkaline system contains soluble pectin, gum arabic, tragacanth gum, guar gum, agar and other polysaccharides, calcium ions and iron ions and other divalent cations will combine with the hydroxyl groups of these polysaccharides to make them precipitate and thus remain in the fiber cavities. Laboratory studies have shown that calcium chloride and ferric sulfate solutions can retain tannin in the fiber cavities. One kilogram of pine chemical pulp, a total liquid volume of 10 liters, and 50 grams of tannin are added. After passing through a high-pressure homogenizer, the pulp is treated by elution. It is determined that 39.5 grams of tannin remain in the fiber cavities. Three experiments were designed in parallel. After passing through the homogenizer, one sample was not added with a fixing agent, one sample was added with 20 grams of ferric sulfate, and one sample was added with 10 grams of calcium chloride. After stirring for 30 minutes, the samples were repeatedly squeezed and dewatered and eluted three times. The tannin concentration in the filtrate was measured, and the retention rate of tannin in the fiber was calculated. The results are shown in Table 6. From the data, it can be seen that without a fixing agent, the retention rate of tannin is only 2% after three times of squeezing, dewatering and elution. However, with the addition of a fixing agent, the retention rate of tannin is about 90%.

[0081] Table 6. Tannin retention rate in pulp fiber cavities with different fixing agents

[0082] .

[0083] Example (three), the present application also relates to a kind of no plastic coating formula and preparation method suitable for traditional Chinese medicine packaging paper, its characteristics include:

[0084] S3.1. The coating is a water-based coating, and the water-soluble components, water-insoluble components, fillers and emulsifiers are all derived from nature, including plants, animals and minerals.

[0085] S3.2. Water-soluble ingredients of the coating include tannin, plant polyphenol, alkaloid, nicotine, flavonoid, glycoside (0.2-2wt%), which play the role of anti-oxidation, microbial inhibition and insect prevention in the coating. The water-soluble compounds are derived from commercial purchase or the process liquid of the mechanical pulp described above;

[0086] S3.3. Water-insoluble ingredients of the coating include high-ester pectin (2-5wt%), rosin (2-5wt%), wax (2-10wt%), dry vegetable oil (20-50wt%), terpenes (0.01-0.2wt%), which play the role of adhesive, water-proof agent, film-forming agent and the like in the coating.

[0087] S3.4. The filler of the coating is selected from conventional mineral particles such as calcium carbonate, china clay, silica, talc and the like.

[0088] S3.5. The water-based coating is prepared by emulsifying the water-insoluble ingredients, using natural emulsifiers (2-5%) including but not limited to lecithin, lanolin, beeswax, sodium lignosulfonate.

[0089] S3.6. The water-based coating is prepared by high-speed shearing or micro-fluidization under air-tight or air-isolated conditions.

[0090] The outstanding feature of the coating formula is that it contains active ingredients of traditional Chinese medicine, which is suitable for traditional Chinese medicine packaging paper. These traditional Chinese medicine ingredients are particularly derived from the mechanical pulp process liquid of traditional Chinese medicine materials. The water-insoluble ingredients in the coating are all derived from natural plants, rather than conventional organic synthetic resins (such as styrene-butadiene latex, styrene-acrylate latex, polyacetate latex, acrylic latex, etc.) used in conventional paper. These natural water-insoluble ingredients are emulsified and dispersed into small droplets to prepare water-based coating. The water-based coating is different from solvent-based coating, which does not contain organic solvents, and has the characteristics of environmental protection and health.

[0091] Example (four), the present application also relates to the pulp preparation and papermaking process of plastic-free traditional Chinese medicine packaging paper:

[0092] S4.1. The pulp of the base paper includes the hot ground mechanical pulp (10-40%) described in example (one), the modified chemical pulp (10-30wt%) described in example (two), and conventional chemical wood pulp (50-60wt%).

[0093] S4.2. The conventional chemical wood pulp and the hot ground mechanical pulp described in example (one) are separately beaten, and the modified chemical pulp described in example (two) is not beaten.

[0094] S4.3. After mixing all kinds of pulp, the pulp enters the paper machine, and the dilution of the pulp uses the process water of step 2 in example (one).

[0095] S4.4. Closed cycle of process water (white water) of paper machine operation, the temperature of paper sheet in temperature zone of drying cylinder is lower than 100℃.

[0096] The pulp preparation and base paper making process is different from the conventional one. Firstly, the modified chemical pulp is not beaten, in order to prevent the loss of the traditional Chinese medicine components contained in the fibers. Secondly, the dilution water used in the pulp preparation is the process water from step 2 of Example (I), which contains traditional Chinese medicine components. Finally, the drying cylinder temperature of the paper sheet is lower than 100℃, in order to prevent the inactivation of the traditional Chinese medicine components.

[0097] Example (V), the present application relates to the coating process of plastic-free traditional Chinese medicine packaging paper:

[0098] S5.1. The coating layer is dried and formed by using non-contact methods such as infrared radiation or hot air.

[0099] S5.2. Inorganic particles, including but not limited to calcium carbonate, talc, china clay, and silicon dioxide, are sprayed on the surface of the coating layer before the paper is wound up, and the powder spraying amount is 10-20g / m 2 .

[0100] Because the film-forming material of the water-based paint is dry vegetable oil, no drying agent (usually containing toxic cobalt, manganese, lead, iron, zinc, and calcium oxides of metals) is added, and no chemical cross-linking and curing resin is used, the dry vegetable oil dries slowly, so it is not suitable for contact drying with the drying cylinder, but non-contact infrared and hot air are used to prevent the dried paint from sticking. Secondly, the powder is sprayed before the paper is wound up, which is also to prevent the paint from sticking.

[0101] Example (VI), a method for manufacturing traditional Chinese medicine packaging paper resistant to humid environment, specifically comprising the following steps:

[0102] S6.1 Extraction of gossypol and pectin from cotton stalks and preparation of mechanical cotton stalk fibers: The cotton stalks are soaked in a 10g / L sodium oxalate solution, and after preliminary crushing, the material is less than 5mm in length and width, the soaking concentration is 5%, the soaking temperature is room temperature, and 0.1% vitamin C is added to the system based on the mass of the cotton stalks. The material is ground between 200 μm (beating consistency 10%), 60 μm (beating consistency 6%), and 10 μm (beating consistency 4%) grinding disc spacings in turn, to obtain mechanical cotton stalk fibers, and the maximum temperature in the grinding disc area is 55℃. The pulp is spiral pressure filtered to separate the solid and liquid, to obtain cotton stalk fibers and filtrate rich in gossypol and pectin.

[0103] S6.2 Modification of softwood chemical pulp: Softwood chemical pulp was commercially purchased, and was in the form of pulp board. The pulp was put into a water defibrator, and the defibration concentration was 5%. The fibers with size higher than 100 mesh were used after passing through a 120 mesh screen. The filtrate rich in gossypol and pectin described in step (6.1) was added during the defibration process. The dispersed pulp was pumped into a micro-jet high pressure homogenizer, and the cavity diameter was selected to be 200 μm, and the pressure was selected to be 150 Mpa. The pulp from the homogenizer was added with calcium chloride, and the amount of substance of calcium ions was greater than that of oxalate in the system. The material was stirred to form calcium oxalate, plant polyphenol calcium, and calcium pectin particles, so as to fix the active substances in the cell cavity of the chemical pulp.

[0104] S6.3 Fiber ratio and papermaking of the base paper of the traditional Chinese medicine packaging paper: The mass fraction of the fibers of the base paper was 20% of the modified unbleached softwood chemical pulp, 40% of the cotton stalk fibers described in step (6.1), and 30% of the modified chemical pulp fibers described in step 6.2. After the fibers were mixed, the paper was made by wet papermaking, and the white water of the paper machine was closed circulation. The basis weight of the base paper was controlled to be 80 g / m 2 . After the paper sheet (base paper) was dehydrated and dried, it was super-calendered to a tightness of 1.16 g / cm 3 .

[0105] S6.4 Preparation of water-based paint and coating of the base paper: The paint formula was high-ester pectin (2 wt%), shellac (2 wt%), rosin (2 wt%), wax (8 wt%), dry vegetable oil (20 wt%), the filtrate described in step (6.1) (60 wt%), and lecithin (6 wt%). The water-based paint was prepared by high-speed shearing or high-pressure homogenization. The paint was coated on the base paper, and the coating amount of one side was controlled to be 6 g / m 2 . Calcium carbonate was sprayed, and the average particle size of the heavy calcium carbonate was 50 μm, and the spraying amount was 10 g / m 2 . After detection, the performance of the prepared traditional Chinese medicine packaging paper was as follows: tensile index 74 N.m / g, tear index 12 mN.m 2 / g, burst index 3.9 Kpa.㎡ / g, water vapor transmission rate 38.6 g / (m 2 .d), moisture permeability coefficient 5.6e-12 g.cm / cm 2 .s.Pa.

[0106] Example (seven) manufacturing method of the antibacterial and insect-proof plastic-free traditional Chinese medicine packaging paper, specifically comprising the following steps:

[0107] S7.1 Extraction of laccaic acid and urushiol from lacquer tree wood (lacquer wood) and fiber preparation: 1000 grams of lacquer wood was crushed, 50 grams of sodium carbonate, 2 grams of vitamin C were added, 5000 grams of water was added, mixed, sealed and soaked in air-tight room for 2 hours. Then the material was ground in closed conditions at 100 μm (pulping concentration 8%), 50 μm (pulping concentration 5%), 12 μm (pulping concentration 4%) between the grinding disc spacing, to obtain the mechanical method of lacquer wood fiber, the highest temperature of the grinding disc area is 50℃, to prevent the heat curing of raw lacquer (urushiol). The pulp was filtered by screw press, and the lacquer wood fiber and the filtrate rich in laccaic acid and urushiol were separated. The filtrate was stored in the dark and air-tight.

[0108] S7.2 Modification of softwood chemical pulp, softwood chemical pulp was commercially purchased, and was in the form of pulp board. 2500 grams was put into a water defibrator, and the defibration concentration was 5%. The lacquer filtrate described in step (7.1) was added during the stirring and defibration process. The dispersed pulp was pumped into a micro-jet high-pressure homogenizer, with a cavity diameter of 200 μm and a pressure of 150 Mpa. The pulp from the homogenizer was added to all the lacquer wood fibers described in step (7.1), and after stirring and dispersing evenly, the material was again treated in a micro-jet high-pressure homizer, with a cavity diameter of 300±100 μm and a pressure of 250±50 Mpa. The plant particles were guided into the fiber cell cavity through the pressure change inside the high-pressure homogenizer, realizing physical plugging of active substances.

[0109] S7.3 Pulp ratio and papermaking of base paper, pulp composition: 10% of natural pine chemical pulp (commercial product), 90% of softwood chemical modified pulp described in step (7.2). The natural pine chemical pulp was beaten to 40°SR. The softwood chemical modified pulp described in step (7.2) was beaten to 25°SR. The pulp was mixed and adjusted to the appropriate concentration, and base paper with a basis weight of 80 g / m 2 was made by papermaking, and the white water of the paper machine was closed circulation during the papermaking process.

[0110] S7.4 Water-based paint formula and preparation, the mass fraction of the paint components is, for example, as follows: tannin, gossypol (each 0.5wt%), floating oil pine rosin (2wt%), wax (2wt%), dry vegetable oil (23wt%), lacquer tree and tobacco straw mechanical pulp water in the pulping section (70wt%), sodium lignosulfonate (2.5%), and a high-speed shearing method was used to prepare the water-based paint.

[0111] S7.5 Water-based paint was coated on the surface of the base paper by film transfer method, and the single-sided coating amount was controlled to be 4 g / m 2 ; calcium carbonate was sprayed, and heavy calcium carbonate with an average particle size of 50 μm was used, with a spraying amount of 10 g / m 2 . After rewinding, a Chinese medicine packaging paper with antibacterial and insect-proof properties and without plastic was obtained, which can be used to produce paper bags.

[0112] S7.6 After testing, the prepared paper sample has a bacterial inhibition rate of more than 73% for Escherichia coli, Staphylococcus aureus, Candida albicans, Pseudomonas aeruginosa, Streptococcus pneumoniae, and dermatophytes. After paper sample weight loss testing, the paper sample mass loss is less than 3% within 5 years. The termite test shows that there is no obvious erosion within 2 years, and the mass loss is 4.3%. Compared with ordinary kraft paper, the termites erode severely within 10 days of the termite test, and the mass loss is 78%.

[0113] Example (eight), a method for manufacturing a high-air-permeability Chinese medicine packaging paper with tea aroma, specifically comprising the following steps:

[0114] S8.1 Tea tree active substance extraction and tea tree fiber preparation, mechanically crushing tea tree trunk and side trunk wood, and the crushed material is less than 5 mm in length and width. Soak the material in a sodium phosphate aqueous solution, the amount of sodium phosphate is 4% of the tea tree, add 0.2% of vitamin A to the tea tree, the soaking concentration is 8%, and the soaking temperature is 30-40℃. The material is ground for the first time at a mill gap of 100 μm, and then ground for the second time at a gap of 15 μm, and the grinding concentration is 4%. The material is extruded by a screw to obtain filtrate and tea tree fibers.

[0115] S8.2 Modification of needle leaf wood chemical pulp, the needle leaf wood chemical pulp is commercially purchased, and is a pulp board form of goods. Put it into a water slushing machine, and the slushing concentration is 5%. Screen the fibers higher than 80 mesh through an 80 mesh screen. Add the filtrate described in step (8.1) during the stirring and slushing process. Pump the slushed pulp into a micro-jet high-pressure homogenizer, the cavity diameter is selected to be 220 μm, and the pressure is selected to be 80 Mpa. Add calcium gluconate to the pulp coming out of the homogenizer, and the amount of calcium gluconate added is 5% of the tea tree, the sodium carbonate and calcium gluconate react, and the calcium gluconate also reacts with tea polyphenols, caffeine, theophylline, etc. in the filtrate described in step (8.1), so as to realize the fixation of the chemical pulp cell lumen active substances.

[0116] S8.3 Raw paper pulp ratio and pulp preparation, the raw paper pulp ratio is: 20% hardwood chemical pulp (commercial pulp), 30% tea tree fibers described in step (8.1), and 50% modified chemical pulp described in step (8.2).

[0117] 20% hardwood chemical pulp is beaten, the beating concentration is 10%, and the beating degree is 30°SR. The other two kinds of pulp are not beaten.

[0118] S8.4 Water-based paint formula and preparation, the paint composition: tannin (5wt%), raw starch (10wt%), gum rosin (7.5wt%), dry vegetable oil (15wt%), mechanical pulp process water described in step (8.1) (60wt%), and paraffin (2.5wt%). The water-based latex paint is prepared by using a high-pressure homogenization method.

[0119] S8.5 Papermaking and coating, the three kinds of slurry of step (8.3) are mixed, wet papermaking, white water closed circulation of paper machine, and the basis weight of the paper is controlled to be 100 g / m 2 . The aqueous coating of step (8.4) is double-side coated, and the single-side coating amount is controlled to be 2 g / m 2 ; the coating is powder calcium carbonate, the average particle size of the heavy calcium carbonate is 50 μm, and the spraying amount is 10 g / m 2 . It is detected that the paper sample has strong tea aroma, in addition, the air permeability of the paper sample is 30 μm / (Pa·s), the burst index is 7.3 KPa·m 2 / g, and the tear degree is 1200 mN.

Claims

1. A method for making a base paper for Chinese medicine wrapping paper, characterized by The method comprises: Step one: The fiberization treatment of the lignocellulosic traditional Chinese medicine plant and the extraction of active ingredients, comprising the following steps: Step 1: soaking: soaking the crushed lignocellulosic traditional Chinese medicine plant with a multi-element weak acid strong alkali salt solution, adding an antioxidant to the soaking system, controlling the amount of weak acid strong alkali salt, and controlling the final pH of the soaking solution to be in the range of 7.0-9.6; The lignocellulosic traditional Chinese medicine plant includes lignocellulosic traditional Chinese medicine plants rich in high-ester pectin, tannin and flavonoids, and alkaloids; Step 2: mechanical fiberization treatment: mechanical fiberization treatment of the soaked traditional Chinese medicine plant, using a multi-pass pulping process, and the gap of the final pass pulping is less than 2-5 μm of the width of the traditional Chinese medicine plant fibers, so as to completely release the traditional Chinese medicine ingredients; Step 3: extrusion filtration: extruding the slurry to obtain mechanical traditional Chinese medicine plant fibers and a filtrate containing traditional Chinese medicine active ingredients, and the hydroxyl and carboxyl groups of the traditional Chinese medicine active ingredients in the filtrate are ionized under weak alkaline conditions and dissolved in the form of sodium salt; Step two: Modification of wood chemical pulp, comprising the following steps: Step 2.1: screening of chemical pulp fibers: Using commercial chemical pulp as raw material, using a 60-mesh screen to screen out fibers with a length less than 0.25 mm, and collecting paper pulp with a length greater than 0.25 mm; Step 2.2: dispersing and dispersing chemical pulp: The dispersing concentration is 5%-10%, and the dispersing water is the filtrate obtained in step 3 of step one; Step 2.3: introduction of traditional Chinese medicine ingredients into chemical pulp fiber cavities: Dispersed pulp is fed into a micro-jet high-pressure homogenizer for treatment, the air in the fiber cavities is driven out through the pressure change in the high-pressure homogenizer, and the traditional Chinese medicine ingredients are introduced into the fiber cavities; Step 2.4: fixing traditional Chinese medicine ingredients in chemical pulp fiber cavities by precipitation method: The pulp from the homogenizer is added with a fixing agent to fix the traditional Chinese medicine ingredients in the cavities, the fixing agent is a soluble calcium salt solution or a solution containing iron ions; the amount of calcium / iron ions is equal to the total amount of anions in the system in stoichiometric amount; the material is stirred to make the traditional Chinese medicine active ingredients containing carboxyl and hydroxyl groups react with calcium / iron ions to form a precipitate, and the anions in the system react with calcium / iron ions to form a precipitate, so as to block the cavities of the chemical pulp; Step 2.5: physical blocking of traditional Chinese medicine in chemical pulp fiber cavities: The pulp from the homogenizer is added with the traditional Chinese medicine plant fibers obtained in step 3 of step one; after stirring and dispersing uniformly, the material is again fed into a micro-jet high-pressure homogenizer for treatment, and the plant particles are introduced into the fiber cavities through the pressure change in the high-pressure homogenizer to achieve physical blocking; Step 2.4 and step 2.5 are selected, and the modified chemical pulp is obtained; Step three: Preparation of traditional Chinese medicine packaging paper base paper, comprising the following steps: Step 3.1: raw materials: Raw material (1) is unmodified chemical pulp fiber; Raw material (2) is the mechanical fiberization treatment pulp slurry in step 2 of step one; Raw material (3) is the modified chemical pulp obtained in step two; Step 3.2: treatment of raw materials: Raw material (1) and raw material (2) are separately beaten, and raw material (3) is slightly beaten or not beaten; Step 3.3: The treated raw materials (1), (2), (3) of the previous step are mixed and fed into the paper machine, and the dilution of the pulp fibers is performed using the filtrate of step 3 of step 1, and the process water is closed-circulated during the operation of the paper machine; The Chinese medicine packaging paper base paper is obtained by the method.

2. A coating process for Chinese medicine wrapping paper, characterized by The method comprises the following steps: Step 5.1: The Chinese medicine packaging paper base paper obtained by the method for making Chinese medicine packaging paper base paper according to claim 1 is dehydrated and dried, and then coated with a special water-based coating for Chinese medicine packaging paper; Step 5.2: The coating is dried into a film by using infrared radiation or non-contact hot air drying; Step 5.3: Sprinkle inorganic particles on the surface of the coating before the paper is curled, the amount of inorganic particles is 10-20 g / m 2 ; The preparation method of the special water-based coating for Chinese medicine packaging paper comprises the following steps: The water-soluble component of the coating is the pulp liquor obtained in the multiple refining process of step 2 of step 1 of claim 1; The water-insoluble component of the coating comprises high-ester pectin, rosin, wax, dry vegetable oil, and terpenes; The natural emulsifier used in the coating comprises lecithin, lanolin, beeswax, and sodium lignosulfonate; In the water-insoluble component of the coating, the content of high-ester pectin is 2-5 wt%, the content of rosin is 2-5 wt%, the content of wax is 2-10 wt%, the content of dry vegetable oil is 20-50 wt%, and the content of terpenes is 0.01-0.2 wt%; The content of the natural emulsifier in the coating is 2-5 wt%; The water-soluble component of the coating is supplemented to 100% by the pulp liquor; The special water-based coating for Chinese medicine packaging paper is prepared by using high-speed shearing or micro-jet method under air-tight or air-isolated conditions.

3. A method of manufacturing a high permeability Chinese medicine wrapping paper having a tea aroma, characterized by The method comprises the following steps: Step 8.1: Extraction of tea tree active substances and preparation of tea tree fibers The main stem and side stem wood of the tea tree are mechanically crushed to a length and width of less than 5 mm, the crushed material is soaked in a sodium phosphate aqueous solution, the amount of sodium phosphate is 4% of the tea tree, 0.2% of vitamin A is added to the tea tree, the soaking concentration is 8%, and the soaking temperature is 30-40℃; The material is refined for the first time between 100 μm grinding disc spacing, and then refined for the second time between 15 μm spacing, and the refining concentration is 4%; the material is extruded by a screw to obtain filtrate and tea tree fibers; Step 8.2: Modification of conifer chemical pulp The conifer chemical pulp is in the form of pulp board; the conifer chemical pulp is put into a water defibrator, and the defibration concentration is 5%; fibers with a size higher than 80 mesh are selected by passing through an 80 mesh screen; the filtrate described in step 8.1 is added during the stirring and defibration process; the defibrated pulp is pumped into a micro-jet high-pressure homogenizer, the cavity diameter is selected to be 220 μm, and the pressure is selected to be 80 Mpa; the pulp from the homogenizer is added with calcium gluconate, and the amount of addition is 5% of the mass of the tea tree; Step 8.3: Pulp stock preparation for base paper Pulp stock preparation for base paper: 20% broadleaf chemical pulp, 30% tea tree fibers described in step 8.1, and 50% modified conifer chemical pulp described in step 8.2; The 20% broadleaf chemical pulp is beaten to a beating concentration of 10% and a beating degree of 30°SR; the other two kinds of pulp are not beaten; Step 8.4: Water-based coating formula and preparation Coating composition: the content of tannin is 5wt%, the content of raw starch is 10wt%, the content of gum rosin is 7.5wt%, the content of dry vegetable oil is 15wt%, the content of step 8.1 mechanical pulp process water is 60wt%, the content of paraffin is 2.5wt%; the water-based latex paint is prepared by high-pressure homogenization method: Step 8.5: papermaking and coating: The three slurries of step 8.3 were mixed and wet-laid, with a paper machine white water closed cycle, controlling the basis weight of the raw paper at 100 g / m2 2 ; The aqueous latex paint of Step 8.4 was applied on both sides, and the single-side coating amount was controlled to 2 g / m 2 ; the coating was applied with a spray powder calcium carbonate, and the spray amount was 10 g / m 2 ; The high-air-permeability traditional Chinese medicine packaging paper with tea aroma is obtained.