KR100811193B1 - Pulp made from rhodophyta and manufacturing method thereof - Google Patents

Abstract

The present invention, immersing red algae in an acidic aqueous solution to remove the calcium carbonate component formed on the skin of the red algae, immersing red algae in an extraction solvent capable of dissolving the gel component to dissolve the gel component in the extraction solvent, gel component It provides a pulp and paper manufacturing method using red algae comprising the step of removing the dissolved solution and collecting the residue of the residue and pulping. The pulp and paper produced according to the present invention is cheaper to produce than the cost of purchasing raw wood and the use of chemicals for lignin removal and bleaching can be significantly reduced to prevent environmental pollution. In addition, the final product does not contain harmful chemicals and thus does not have a harmful effect on the human body or the environment.

Red algae, pulp, paper, agar, extract

Description

Pulp made from red algae and its manufacturing method {PULP MADE FROM RHODOPHYTA AND MANUFACTURING METHOD THEREOF}

1 is a flow chart of a paper manufacturing method using red alga according to the present invention.

Figure 2 is a photograph of the loaf of the washing is completed through the above process.

Figure 3 is a photograph of the starfish bleached with chlorine dioxide.

4 is a photograph of a wood starfish bleached with hydrogen peroxide.

FIG. 5 is an electron micrograph at 1200 times magnification of pulp, classified into fibers and pulped.

6 is a photograph of a general sheet of paper produced through the above process.

Fig. 7 is a microscope photograph at a magnification of 1200 times the normal sheet paper to which metering was applied.

FIG. 8 is a micrograph at 1200 times magnified a general handwriting paper to which a halo was applied. FIG.

9 is a photograph of the projection paper produced through the above process.

Fig. 10 is a microscope photograph at 1200 times magnified projection paper to which photometry is applied.

FIG. 11 is a microscope picture at 1200 times magnified a projection paper to which a halo was applied. FIG.

12 is a flowchart of a second embodiment of a paper manufacturing method using red alga according to the present invention.

FIG. 13 shows a state in which a gel solution is added to a reaction solvent using an extrusion nozzle.

14 shows a state in which a gel solution is added to a reaction solvent by using a spray nozzle.

<Description of the symbols for the main parts of the drawings>

100: reaction solvent 200: gel solution

210: extrusion nozzle 220: injection nozzle

The present invention relates to pulp and paper and a method for producing the same, and more particularly, to pulp and paper using red algae rather than wood as a raw material of the pulp and paper, and a method for producing the same.

Generally, fibers obtained by mechanically or chemically treating a plant raw material are called pulp. In fact, in addition to wood, cotton, hemp, flax, jute, german hemp, manila hemp, cedar, bamboo, straw, esparto, bamboo, bagasse, etc., are used as pulp raw materials. However, the requirements to be provided as industrial raw materials should be abundant in quantity, easy to collect, transport and store, inexpensive and excellent in quality.

Wood, which is a major pulp feed material, is mainly composed of cellulose, hemicellulose, and lignin, and these components constitute the cell wall and the intercellular layer and are present in more than 90% of all species. Subcomponents include resins, essential oils, fats and oils, extracts such as tannins and flavonoids, and other inorganic substances. Among them, cellulose is present in the largest amount of organic compounds present in nature, and is the main component of the plant cell wall. Cellulose is a high molecular material insoluble in water, dilute acid and alkali at room temperature, and having D-glucose residues bound to ??-1: 4-glucoside. In order to industrially use wood cellulose, it is used as a wood sugar by manufacturing paper through hydrolysis, bleaching, refining, etc., or by hydrolyzing wood, and making and using cellulose derivatives through various chemical treatments. Doing.

Various operations are performed from the raw material to the pulp, but it can be largely classified into preparation of pulp raw material, pulping, and purification of pulp. In the process of processing a wood raw material in the state which is easy to pulp, there are operations, such as cutting, peeling, and sorting, and this is performed suitably according to the kind of raw material. The process of obtaining fibers from the raw material after the preparation process is called a pulping process and is the most important process in pulp production.

Fibers can be obtained by destroying the composite intercellular layer of wood, which is a pulp material, with a wood mill or by softening it with water vapor and then breaking it using physical force. The pulp obtained by simple mechanical treatment without chemical treatment is called mechanical pulp. Mechanical pulp has high yield and low production cost, but its high lignin content makes it unsuitable for high grade paper.

Treatment of the pulp feedstock with ligignin chemicals dissolves the complex intercellular layer and dissociates it into fibrous form. Pulp prepared in this way is called chemical pulp. In the preparation of chemical pulp, not only the lignin in the intercellular layer of the raw material but also most of the cell membrane lignin are removed, at the same time, many hemicelluloses are dissolved and some cellulose is also degraded. Chemical pulp has high quality, i.e., high purity of cellulose, but has a disadvantage of low yield and high production cost compared to mechanical pulp. Chemical pulp production methods include sulfurous acid method, soda method and sulfate method.

The selection process is a process of washing and screening fibers obtained from the raw material after the pulping process to remove parts and contaminants that are not completely pulped, and then bleaching as necessary. Specific refinement treatments are performed for those requiring high quality, such as rayon pulp.

The above is the description about the general process of manufacturing pulp from wood raw materials. However, as the depletion of wood resources around the world becomes severe, the task facing the industry is to produce paper stock pulp while protecting forests and the environment. As a solution to this problem, a technique for producing paper pulp from non-woody plant fibers mainly on first and second year plants has attracted attention.

Non-woody plants that can be used as a raw material for papermaking include bark, flax, hemp, cotton, manila hemp, rice straw and bagasse. In general, non-woody plants are high in pectin, hemicellulose, minerals, low in lignin, and chemical, semi-chemical and mechanochemical methods are used when pulping and are very mild compared to wood. Bleached or bleached pulp can be obtained.

Non-wood pulp will have different properties depending on its fiber type, chemical composition, and the type and amount of non-fibrous cells. Therefore, the paper made by non-wood pulp alone or by proper blending with wood pulp can easily control the strength, durability, electrical characteristics, gloss, dimensional stability and printing performance, which can be used for various purposes. Therefore, the use range is also wide.

However, the soda method, the sulfite method, and the kraft method are mainly used to prepare paper pulp from non-wood based plant fibers. In the production of such pulp, the sulfite method and the kraft method must use a large amount of sulfur compounds such as Na ₂ SO ₃ or Na ₂ S as cooking solutions. Odor and wastewater contamination by these compounds have reached severe levels. Although a soda cooking method has been proposed as the desulfurization pulping method, soda alone has a problem that not only the pulp yield is lowered but also the strength of the paper is lowered. In order to compensate for this, anthraquinone has recently been used as a preparation with soda, but anthraquinone has difficulty in preparing a cooking solution and is difficult to biodegrade. In addition, because anthraquinone is very expensive, it may also cause an increase in the production cost of non-wood pulp.

For example, a method for producing pulp using corn has also been proposed, but when the pulp is prepared using a corncob as a paper pulp raw material, highly toxic chemicals are used to contaminate the environment and to secure corn as necessary. The disadvantage is that there are difficulties in terms of location and cost.

In order to solve the above problems of environmental pollution, the present invention has been proposed 'pulp made of red algae and paper and its manufacturing method (Application No.:10-2004-0092295)', but in this way In the case of manufacturing paper, calcium deoxidation generated in the algae shell is not sufficiently removed, thereby causing pulp to agglomerate by the calcium carbonate component, resulting in uneven thickness of paper.

In addition, even in the process of extracting the gel component of the red algae, simply immersing the red algae in the extraction solvent also had a problem that the extraction of the gel component is not made smoothly.

The present invention has been made to solve the above problems, pulp and paper that can protect forests and prevent environmental pollution without requiring toxic chemicals in the process of cooking and bleaching, and their The purpose is to provide a manufacturing method.

It is still another object of the present invention to provide pulp and paper produced by minimizing waste from pulp raw materials and a method for producing the same.

The present invention discloses pulp and paper made from red algae and a process for producing the same.

Red algae pulp manufacturing method according to the present invention, the step of removing the calcium carbonate component in the red algae shell by immersing the red algae in an acidic aqueous solution, immersing the red algae in an extraction solvent that can dissolve the gel component to extract the gel component Dissolving in a solvent, removing the solution in which the gel component is dissolved, and collecting and pulping the residue that is a residue.

In addition, the red algae pulp manufacturing method according to the present invention, the step of removing the calcium carbonate component in the red algae shell by immersing the red algae in an acidic aqueous solution, immersing the red algae in an extraction solvent that can dissolve the gel component to the gel component It may be configured to include the step of dissolving in the extraction solvent, the step of reacting the dissolved gel component with the reaction solvent to a fiber, curing the fiber with a curing agent, pulping the cured fiber.

The step of converting the fiber may be continuously extruding the gel component solution into the reaction solvent through the extrusion nozzle, or the gel component solution may be intermittently sprayed into the reaction solvent through the injection nozzle.

Another method of manufacturing red algae pulp according to the present invention comprises the steps of removing red calcium carbonate formed on an algae shell by immersing red algae in an acidic solution, and immersing red algae in an extraction solvent capable of dissolving a gel component of a gel component. Dissolving only a portion in the extractant, removing a solution in which a part of the gel component is dissolved, collecting the residue, curing the residue with a curing agent, and pulping the cured residue. have.

It is preferable that the pH of the acidic aqueous solution is 2 to 4, and the step of removing the calcium carbonate component is continued until the weight of ash remaining after complete combustion at 900 ° C. becomes 2% or less of the total weight of the completely dried state before combustion. do.

The extraction solvent may be any one of water, an alcohol solvent, a ketone solvent, and preferably 60 ° C. or more.

In addition, the method of producing red algae pulp according to the present invention further includes an oxygen treatment step of injecting oxygen into the red algae before the red algae are precipitated in the extraction solvent. At this time, oxygen is 2 to 15 atm and preferably 40 to 150 ° C.

In addition, the red algae pulp manufacturing method according to the present invention further comprises the step of bleaching red algae using a bleaching agent. The bleach is preferably a non-chlorine bleach.

In the dissolving step, the red alga may be crushed and then immersed in the extraction solvent.

The red algae may be any one or more selected from the group consisting of Locust spruce, stone spruce, gambling and noodle sprouts, or a mixture of two or more thereof, but includes all red algae in which minimal fibers are present.

It is preferable that the said reaction solvent is 80 degreeC or more. The reaction solvent is an alcohol solvent or a ketone solvent, it is preferable that the material is different from the extraction solvent.

The curing agent used in the present invention may include an aldehyde curing agent, and may include glyoxal.

The present invention provides red algae pulp prepared according to the method described above.

The paper manufacturing method according to the present invention comprises the steps of preparing red algae pulp prepared according to the above-described method, and manufacturing a papermaking paper using the pulp. The present invention provides a paper made according to this method.

The paper manufacturing method according to the present invention comprises the steps of preparing a red algae pulp prepared according to the above-described method, preparing a wood pulp, mixing two or more of the pulp of the pulp, using the pulp mixture To prepare a paper, comprising a humidity control step of controlling the moisture contained in the paper. The present invention provides a paper made according to this method.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to pulp and paper prepared with red alga according to the present invention and a manufacturing method thereof.

Example 1

1 is a flow chart of a paper manufacturing method using red alga according to the present invention.

As shown in Figure 1, the paper manufacturing method using the red alga according to the present invention, the washing step (S10) to remove the calcium carbonate component formed in the red algae shell by immersing the red algae in an acidic aqueous solution, the gel contained in the red algae Oxygen pretreatment step (S11) for injecting oxygen to enhance the component removal effect and the bleaching effect, and an extraction step of dissolving the gel component contained in the red algae in the extraction solvent by immersing the red algae in an extraction solvent capable of dissolving the gel component. (S12), bleaching step of changing the color of red algae by extracting or changing the pigment contained in the red algae (S13), the step of collecting and pulping the residue of the residue of the red algae is completed and pulp (S14), pulp It comprises a step (S15) to manufacture a resin paper using.

Red algae used in the present invention is not limited to a specific red algae, and may be applied to various kinds of red algae, such as scabbard, loot, Cotoni and Spinosum.

The washing step (S10) is a step for removing impurities contained in red algae, and basically washes red algae with water (H ₂ O), but if it is desired to remove some of the pigments such as red algae sodium hydroxide (NaOH). ) Or an aqueous alkali solution, such as aqueous potassium hydroxide (KOH) solution. Red algae are slightly discolored through a process of immersion in an aqueous alkali solution and impurities are removed.

In addition, some of the marine organisms, such as coral horses, a type of lime algae, have thick outer walls of calcium carbonate formed on the body's surface, and these calcium carbonate outer walls are formed by the carbonization of lime algae. When algae live and die on the surface of red algae, calcium carbonate is formed on the surface of the red algae. The calcium carbonate component thus formed serves as an impurity to agglomerate the pulp in the papermaking process, and thus, when papermaking is made of red algae that does not remove the calcium carbonate component, the thickness of the paper is uneven. For the same reason, in order to make the thickness of the paper uniform, the calcium carbonate component should be removed in the washing step (S10). The above-mentioned water or alkaline aqueous solution has a low decomposition effect of red algae fiber, which can effectively remove calcium carbonate. none.

Therefore, the washing step (S10), by using an acidic aqueous solution having a high decomposition effect of the red algae fiber is made to effectively remove the calcium carbonate component formed in the red algae shell. At this time, when the pH of the acidic aqueous solution is too high, there is a risk of damage to the red algae, if the pH is too low, the effect of removing the calcium carbonate component is low, the acidic aqueous solution used in the washing step (S10) is acetic acid (CH ₃ COOH ) And an acidic aqueous solution between pH 2 and 5, such as aqueous hydrochloric acid (HCl) solution.

In addition, when the length of the fiber is high and the degree of polymerization is used to use hard red algae, it is necessary to cut the length of the fiber to a certain length. At this time, the red algae is preferably cut to a length of 1 ~ 5㎝. As described above, the process of removing the calcium carbonate component is continued until the weight of ash remaining after complete combustion at 900 ° C. becomes 2% or less of the total weight of the completely dried state before combustion.

Oxygen pretreatment step (S11) is a step of injecting high-temperature, high-pressure oxygen to the red algae so that the extraction and bleaching of the gel component can be effectively performed, the oxygen pressure is 2 ~ 15 atm and the temperature is preferably 40 ~ 150 ℃.

Since red algae pretreated with oxygen occur more smoothly, the gel component extraction and bleaching reactions are effectively performed, and the amount of chemicals used in various processes using the chemicals can be significantly reduced. By reducing the amount of chemicals used as described above, the manufacturing cost can be lowered, and environmental pollution can be reduced.

In addition, the red algae include a variety of low-molecular carbohydrates and gels such as daikon and carrageenan, which causes problems such as increased drug consumption and dehydration when the red algae is composed of pulp fibers. Therefore, the paper manufacturing method according to the present invention includes an extraction step (S12) to extract the red algae immersed in the extraction solvent.

In the extraction step (S12), any extraction solvent for extracting the gel component may be used as long as it can dissolve the gel component such as water, alcohol solvent such as ethyl alcohol or methyl alcohol, ketone solvent such as acetone, etc. Since the melting point of the gel component is about 60 ℃, the temperature of the extraction solvent is preferably heated to 60 ℃ or more.

At this time, the extraction amount of the gel component can be adjusted according to the type of paper to be prepared. That is, the paper may be manufactured using only the residue from which all the gel components are extracted, the paper may be manufactured using the residue in which a part of the gel component remains, or the paper may be manufactured using only the gel component without the residue. The paper manufacturing method shown in FIG. 1 shows a method of manufacturing paper using only residue.

As a method for extracting the gel component, there is a method of extracting the gel component by water extraction of the extraction solvent, and a method of extracting the gel component by spraying the heated extraction solvent to the red algae to be a vapor of 100 ℃ or more. This extraction process will be described in detail in the following examples.

In the case of using the chlorine bleach such as chlorine gas, chlorine dioxide and sodium hypochlorite in the bleaching step (S13), red algae can be bleached very effectively, but since harmful substances such as dioxins are generated, in the present invention, oxygen, ozone, sodium borohydride, etc. Non-chlorine bleach such as sodium hyposulfite, sodium bisulfite, hydrogen peroxide and the like.

Such a bleaching process may be carried out in the middle of each step, but if it is carried out after the aforementioned oxygen pretreatment step (S11) there is an advantage that the amount of chemicals used is reduced.

After the bleaching is completed, the residue is pulped through a process of classifying the fibers filtered on the 200mesh (S14) to produce a paper-like sheet paper (S15), and then paper production is completed.

Hereinafter will be described with respect to the experiment proceeded according to the paper manufacturing method Example 1 according to the present invention.

1. Experimental sequence

 1) wash

The red starfish, a type of red algae, was immersed in an acidic solution at pH 2-3 for 55 minutes to remove impurities and calcium carbonate mixed in the algae. At this time, the pH of the acid solution was adjusted using hydrochloric acid and the temperature was 12 ℃.

FIG. 2 is a photograph of a loot that has been washed through the same process as described above, in which various impurities and calcium carbonate are removed.

 2) extraction

After washing, 100g of dried whole starfish, that is, the weight of 100g when completely dried, was immersed in an aqueous sodium hydroxide solution containing 4% by weight of sodium hydroxide compared to the whole dried starch and treated in a water bath at 40 ° C for 24 hours. .

In this example, a water bath was used to slowly heat the sodium hydroxide aqueous solution as a whole. In addition, the sodium hydroxide aqueous solution was prepared by dissolving sodium hydroxide in water, so that the weight ratio of water and sodium hydroxide was 20: 1.

After the treatment of the water bath at 40 ° C. was completed, the loach was removed, washed with tap water, and then immersed in an aqueous sodium hydroxide solution containing 5% by weight of sodium hydroxide compared to the whole loaf, and then treated in an 80 ° C. water bath for 3 hours. At this time, the weight ratio of water and mantle was 20: 1.

When soaked in the aqueous solution of sodium hydroxide in this way, the surface of the butterfish is hardened and the gel component is also slightly hardened and extracted.

 3) bleaching

Chlorine dioxide and hydrogen peroxide were bleached as a method for bleaching woodworms.

FIG. 3 is a photograph of a pellet of bleached with chlorine dioxide, and FIG. 4 is a photograph of a pellet of bleached with hydrogen peroxide.

Chlorine dioxide bleaching did not proceed as shown in FIG. 3 even though the treatment was performed for 22 hours in a 60 ° C. water bath with a 4% aqueous solution of chlorine dioxide in a 5% aqueous solution of pulp. Therefore, the existing bleach solution was discarded and again bleached with 4% chlorine dioxide aqueous solution for 5 hours.

The hydrogen peroxide bleaching was carried out for 2 hours in a 60% water bath with 5% aqueous solution of hydrogen peroxide at a pulp concentration of 5%. The bleached with hydrogen peroxide bleached close to white as shown in FIG. 4.

The reason why the chlorine dioxide is not well bleached is that the treatment of sodium hydroxide improves the strength of the gel component, which prevents chlorine dioxide from penetrating into the cell wall. In addition, chlorine dioxide is an acidic bleaching activity is high in acidic conditions, but there is a reason that bleaching did not proceed efficiently because the alkaline conditions due to the addition of sodium hydroxide.

Therefore, it can be said that hydrogen peroxide is more effective than chlorine dioxide in pulping and bleaching young starfish.

 4) pulping

After the final bleaching, the fibers of the aggregated wood starch were classified and filtered through a 200mesh mesh using a blender and pulped.

FIG. 5 is an electron micrograph at 1200 times magnification of pulp, classified into fibers and pulped.

As shown in FIG. 5, the pulped woodfish is thin and small enough to be made of paper, such as mechanical pulp of wood.

 5) papermaking

The circular star pulp was made into 60 g / m ² sheet paper.

 6) humidity control

The manufactured paper was subjected to a humidity treatment for 24 hours or more in a constant temperature and humidity chamber controlled at 23 ± 1 ° C. and a relative humidity of 50 ± 2% to measure its physical properties.

FIG. 6 is a photograph of a general sheet made through the above process, FIG. 7 is a photomicrograph of a magnified general sheet of paper subjected to photometry to 1200 times, and FIG. to be.

As shown in Figures 6 to 8, the paper produced by the paper manufacturing method according to the present invention, as compared with paper made of wood, there is no difference in appearance and no defect was found in the density of the tissue.

In addition, when preparing a projection paper, the paper made by a circular weeding paper machine was pressed with a pressure of 3.5 bar for 7 minutes using a wet press (wet press) and dried with a drum dryer (drum dryer).

9 is a photograph of the projection paper produced through the process as described above, Figure 10 is a microscope picture of a projection paper applied to the photometric magnification 1200 times, Figure 11 is a microscope picture to a 1200 times magnified projection paper applied to the halo.

9 to 11, the projection paper produced by the paper manufacturing method according to the present invention, is thinner, tougher, and has a higher transparency as compared to general paper. At this time, the properties of the projection paper may be changed according to the degree of application of wet press and calendar ring.

2. Results and Discussion

Tensile strength is the basic property of paper. Factors affecting tensile strength vary depending on the degree of fiber beating, fiber bonding, and basis weight.

The paper produced by the paper manufacturing method according to the present invention exhibits the same strength as that of ordinary paper in the case of tensile strength, and shows a higher tensile strength value when compared with paper manufactured so that the density is 0.8 or more with ordinary wood pulp. This is a high thermal shear value even in the case of the general paper that is not pressurized due to the remaining gel component.

Example 2

In addition, the method of manufacturing red algae paper according to the present invention may be configured to use a residue containing some gel component, or to use only the gel component. In this case, the method of manufacturing paper using the residue containing the gel component is the same as the method of manufacturing the paper using only the above-mentioned residues, so a detailed description thereof will be omitted, and the method of manufacturing paper using only the gel component. It demonstrates in detail.

12 is a flowchart of a second embodiment of a paper manufacturing method using red alga according to the present invention.

As shown in Figure 12, the red algae paper manufacturing method according to the present invention, by immersing the red algae in an acidic aqueous solution to remove the calcium carbonate component fixedly formed on the skin of the red algae (S20), the gel contained in the red algae Oxygen pretreatment step (S21) for spraying oxygen to enhance the component removal effect and bleaching effect, extraction step (S22) for dissolving the gel component in the extraction solvent by dipping red algae in the extraction solvent capable of dissolving the gel component, dissolution A fibrillation step (S23) of reacting the gel component with a reaction solvent to convert the fibers into fibers, a curing step of curing the fibers with a curing agent (S24), a pulping step of pulping the cured fibers (S25), and a pulp It may be configured to include a step (S26) to manufacture a paper. At this time, until the extraction step (S22) of dissolving the gel component in the extraction solvent is the same as the method for producing a paper using the residue shown in Figure 1, a detailed description thereof will be omitted.

At this time, the red algae are easily extracted as the gel component is increased as the contact area with the extracting solvent increases, so that the red algae is crushed into a chip shape and then immersed in the extracting solvent. Can be.

In addition, the fiberization step of converting the gel component to the fiber (S23) is configured to continuously extrude the gel component solution into the reaction solvent through the extrusion nozzle, or to intermittently spray the gel component solution into the reaction solvent through the injection nozzle. . Hereinafter, a process of converting a gel component into fibers will be described in detail with reference to the accompanying drawings.

FIG. 13 shows a state in which a gel solution is added to a reaction solvent using an extrusion nozzle.

As shown in FIG. 13, the gel solution 200 is extruded long in a thread-like shape to a large amount of the reaction solvent 100 by a device such as an extrusion nozzle 210 so that a reaction can sufficiently occur in the reaction solvent 100. Is preferably added.

Using the extrusion nozzle 210 in this way, it is possible to convert the gel component to fiber in a relatively simple device.

14 shows a state in which a gel solution is added to a reaction solvent by using a spray nozzle.

In order to further improve the reactivity of the gel solution and the reaction solvent, the user may spray the gel solution 200 to a large amount of the reaction solvent 100 using the injection nozzle 220 as shown in FIG. . At this time, the gel solution 200 is preferably sprayed intermittently so as to ensure the time to convert the gel component to fiber.

As such, when the gel solution 200 is injected through the injection nozzle, the gel solution 200 may be added to the reaction solvent 100 thinner than the extrusion method using the extrusion nozzle 210, and thus the user may obtain a thinner fiber.

The reaction solvent is preferably applied as an alcohol solvent or a ketone solvent, and may be applied as long as the gel component can be converted into a fiber which can be used as a pulp even in a liquid other than the alcohol solvent and the ketone solvent. However, if the reaction solvent is selected as the same material as the extraction solvent, it should be noted that the reaction solvent and the extraction solvent should be selected as a different material because the gel component is not converted to a fiber that can be used as pulp, but is dissolved in the semi-application solvent. When the gel solution and the reaction solvent react, the reaction solvent is preferably heated to 80 ° C. or more so that the gel component is not cured.

The fiber obtained through the above steps is not only too low in strength to be used for making paper, but also has low heat resistance and chemical resistance, so that the user hardens the fiber using an aldehyde-based curing agent such as glyoxal. The hardened fibers are pulped through a process such as grinding to a size suitable for paper production. This pulping process is the same as the process after obtaining the fiber in the pulping process of ordinary wood, detailed description thereof will be omitted. The hardened fiber may be used as a pulp since the component change does not occur even when heated to a high temperature or in contact with other solvents during the papermaking process.

In addition, the selection of red algae is not limited to one particular type, and various types of red algae may be mixed and used. For example, there is a method of mixing two or more of woodworm, stalk, kotoni, and spino island. In particular, the twine serves to increase the bonding force, the strength of the final product when added. Therefore, in order to obtain a paper with high strength, the content of the stalks is increased.

The scope of the present invention is not limited to the specific embodiments, but should be interpreted by the appended claims. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

Using the pulp and paper manufacturing method according to the present invention, there is an advantage that the impurities can be easily removed by effectively removing the calcium carbonate components that are firmly formed in the red algae.

In addition, compared to the cost of purchasing raw wood, red algae can be obtained at a significantly lower cost, thereby lowering the manufacturing cost of pulp and paper. The advantage is that it does not affect.

In addition, since red algae do not contain lignin, no complicated process or chemical treatment is required to remove lignin compared to the process for producing wood pulp, and the use of chemicals for bleaching is significantly reduced. Contamination can be prevented and energy loss is reduced since it is cooked at a low temperature compared to the case of manufacturing paper using wood.

In addition, the paper produced by the present invention, because it uses a natural material with a minimum of processing is biodegradable by itself after a certain seal. Therefore, the waste treatment becomes very simple and does not cause environmental pollution because no chemicals are required for waste treatment.

In addition, using the pulp manufacturing method according to the present invention can produce paper without using wood, there is an advantage that it helps to solve various environmental problems, such as prevention of warming through forest protection.

Claims (15)

Dipping red algae in an acidic aqueous solution to remove calcium carbonate formed in the red algae, Treating oxygen with the red carbonate removed from the calcium carbonate component, Immersing the oxygenated red alga in an extraction solvent capable of dissolving the gel component of the red alga, dissolving the gel in the extraction solvent; Removing the solution in which the gel component is dissolved, and then collecting a residue of the residue to pulping Pulp manufacturing method comprising a. Dipping red algae in an acidic aqueous solution to remove calcium carbonate formed in the red algae, Treating oxygen with the red carbonate removed from the calcium carbonate component, Immersing the oxygenated red alga in an extraction solvent capable of dissolving the gel component of the red alga, dissolving the gel in the extraction solvent; Converting the dissolved gel component into a fiber by reacting with a reaction solvent, Curing the fiber with a curing agent, Pulping the Cured Fiber Pulp manufacturing method comprising a. Dipping red algae in an acidic aqueous solution to remove calcium carbonate formed in the red algae, Treating oxygen with the red carbonate removed from the calcium carbonate component, Dissolving the oxygenated red algae in an extraction solvent capable of dissolving the gel of red algae for a predetermined time to dissolve the gel in the extraction solvent; Collecting a residue by removing a solution in which a part of the gel component is dissolved, Curing the residue with a curing agent, Pulping the cured residue Pulp manufacturing method comprising a. The method according to any one of claims 1 to 3, The pH of the acidic aqueous solution is a pulp production method, characterized in that 2 to 4. The method according to any one of claims 1 to 3, Removing the calcium carbonate component, The pulp production method characterized in that the ash remaining when the red algae is completely burned until the weight of the ash is less than 2% of the total weight of the red algae dried before combustion. The method according to claim 5, The extraction solvent is a pulp production method, characterized in that more than 60 ℃. delete The method according to any one of claims 1 to 3, Oxygen injected to the red alga is pulp manufacturing method characterized in that 2 ~ 15 atm and 40 ~ 150 ℃. The method according to any one of claims 1 to 3, And bleaching the red algae using a bleaching agent immediately after dissolving the gel component in the extraction solvent. The method according to claim 9, The bleaching agent is a pulp production method, characterized in that the non-chlorine bleach. The method according to any one of claims 1 to 3, The red alga is pulverized and pulp production method characterized in that it is immersed in the extraction solvent. Preparing red algae pulp by a method according to any one of claims 1 to 3, Preparing a papermaking paper using the pulp Paper manufacturing method comprising a. delete Preparing red algae pulp by a method according to any one of claims 1 to 3, Preparing wood pulp, Mixing the red algae pulp and wood pulp, Preparing a sheet of paper using the pulp mixture Paper manufacturing method comprising a. delete

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