Method for manufacturing short fibers using eucalyptus and short fibers using the same

Abstract

The present invention relates to a method for manufacturing eucalyptus staple fibers and staple fibers manufactured thereby, and a method for manufacturing pulp using the staple fibers and a confirmation that the tensile strength of the pulp manufactured thereby is improved.

Description

Technology Field

[0001] The present invention relates to a method for manufacturing short fibers using eucalyptus and short fibers using the same. More specifically, according to the present invention, the tensile strength of pulp using short fibers is improved. Background Technology

[0002] Pulp from wood and plant materials has various commercial uses. The most common use is paper manufacturing, but it can also be used to manufacture a number of other products, including rayon and other synthetic materials, as well as cellulose acetate and cellulose esters used in the manufacture of, for example, filter tow, cloth, packaging film, and explosives.

[0003] Cellulose is typically obtained from wood pulp and cotton, and can be further modified to produce other derivatives, including cellulose ethers, cellulose esters, and cellulose nitrates. Cellulose derivatives have various commercial uses. For example, cellulose acetate is an acetate ester of cellulose and is used in a wide variety of products, including textiles (e.g., linings, blouses, dresses, wedding and party wear, home furnishings, drapery, drapes, and slipcovers), industrial applications (e.g., filters for cigarettes and other tobacco products, ink reservoirs for fiber-tip pens, and decking), superabsorbent products (e.g., diapers, sanitary pads, and surgical products), thermoplastic products (e.g., film applications, plastic instruments and tapes), cosmetics and pharmaceuticals (sustained-release capsules / tablets and encapsulating agents), and medicines (hypoallergenic surgical products).

[0004] Generally, eucalyptus trees are used as a raw material for cellulose staple fibers, which are utilized in the manufacture of paper, tissues, toilet paper, napkins, copier paper, business cards, etc. As demand for food, packaging, and copier paper increases, the cellulose industry is growing rapidly.

[0005] According to Pφyry, a global paper consulting firm, 11 cellulose construction projects are underway worldwide, and the production of packaging paper alone is expected to increase by 12 million tons between 2022 and 2024. It also projected that global demand for cellulose fibers will increase from 424 million tons in 2020 to 543 million tons in 2035.

[0006] As of 2020, Brazil produced 2,100 tons of cellulose, the second largest amount in the world. Brazilian cellulose manufacturers produced cellulose based on eucalyptus and pine, and exported 1,560 tons of cellulose, which accounted for 74.3% of the production, achieving the number one position in global exports.

[0007] Since it takes about seven years from planting eucalyptus trees to commercialization, a timber supply cliff is inevitable when new cellulose plants are built in large numbers, and Pφyry announced that "eucalyptus tree cultivation land must increase by 800,000 to 1 million hectares by at least the late 2020s," and the timber shortage may accelerate because timber is consumed for charcoal for ironmaking, raw materials for biomass power generation, and furniture in addition to cellulose use.

[0009] "Pulping generally refers to a process for achieving fiber separation. Wood and other plant materials contain cellulose, hemicellulose, lignin, and other minor components. Lignin is a network of polymers interspersed between individual fibers and functions as an intercellular adhesive to bind individual wood fibers together. During the pulping process, lignin polymers decompose to dissociate individual cellulose fibers, dissolving impurities that can cause discoloration and subsequent degradation of paper or other end products."

[0010] Fibers can be obtained by breaking the complex intercellular layers of the raw material with a grinder or by softening them with steam and then breaking them with mechanical force. Pulp obtained through simple mechanical processing without chemical treatment in this way is called mechanical pulp. Although mechanical pulp has the advantages of high yield and low production costs, it has the disadvantage of being unsuitable as a raw material for high-quality paper due to the high content of non-cellulose such as lignin and hemicellulose.

[0011] Chemical pulping is a method of treating pulp raw materials with delignification agents to dissociate complex intercellular layers into fibers, and methods for manufacturing this include the sulfite method, soda method, and sulfate method. In the case of chemical pulping, most of the intercellular lignin and hemicellulose of the raw materials are removed during manufacturing, which has the advantage of high cellulose purity.

[0012] In the above chemical pulping, the conventional kraft pulping method involves pulping wood pieces obtained by high-pressure pulping with a mixed solution of caustic soda and sodium sulfide in the raw wood pulping process, then pulping them at high temperature and high pressure with a mixed solution of sodium sulfite or ammonium sulfite and sodium bicarbonate, and finally fiberizing the wood tissue with a refiner to pulp.

[0013] Generally, kraft pulp wastewater combines with alkali and dissolves, and because it contains lignin or hemicellulose and appears black, it is called black liquor. Most of this solution is treated in multi-stage evaporators, wet combustion furnaces, etc., so except in general factories, only dilute black liquor is discharged along with selected water. Prior art literature

[0014] (Patent Document 0001) KR 10-1980598 B (Patent Document 0002) KR 10-1847039 B The problem to be solved

[0015] The objective of the present invention is to provide a short fiber using a method for manufacturing a short fiber using eucalyptus.

[0016] Another objective of the present invention is to provide a method for manufacturing short fibers as described above.

[0017] Another objective of the present invention is to provide a method for manufacturing pulp using short fibers as described above.

[0018] Another objective of the present invention is to provide pulp using a method for manufacturing pulp using short fibers.

[0019] Another objective of the present invention is to improve the tensile strength of the pulp as described above. means of solving the problem

[0020] To achieve the above objective, a method for manufacturing eucalyptus staple fibers according to one embodiment of the present invention comprises: 1) a step of washing eucalyptus; 2) a step of sorting the washed eucalyptus; 3) a step of impregnating the sorted eucalyptus; and 4) a step of vaporizing the impregnated eucalyptus.

[0021] The impregnation step, which is step 3) above, involves using an impregnation solution composition containing sodium hydroxide and sodium sulfate.

[0022] The steam explosion step, which is step 4) above, is to process for 1 to 20 minutes under conditions of 180 to 230 ℃ and 20 to 40 kg / cm².

[0023] A eucalyptus staple fiber according to another embodiment of the present invention is manufactured by the method for manufacturing the eucalyptus staple fiber.

[0024] Eucalyptus pulp according to another embodiment of the present invention comprises the eucalyptus staple fibers.

[0025] A method for manufacturing eucalyptus pulp according to another embodiment of the present invention comprises: 1) a step of immersing eucalyptus staple fibers manufactured by the method according to claim 1 in an active alkali solution; 2) a step of digesting the immersed eucalyptus active alkali solution; 3) a step of refining the digested eucalyptus active alkali solution; 4) a step of washing the refined eucalyptus; and 5) a step of sorting the washed eucalyptus.

[0026] Step 2) above further includes a rapid cooling step.

[0028] The present invention will be described in more detail below.

[0030] All technical terms used in this invention, unless otherwise defined, have the following definitions and correspond to the meaning generally understood by those skilled in the art in the relevant field of this invention. Additionally, while preferred methods or samples are described herein, similar or equivalents are also included within the scope of this invention.

[0032] Throughout this specification, when a part is described as "comprising" a certain component, it means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0033] In the specification of the present invention, plants are not limited to any type and can be used without restriction on their source, such as using cultivated ones or commercially purchased ones.

[0034] In the specification of the present invention, the extract may be extracted by a method known in the art, and the method is not particularly limited. Alternatively, a commercially available extract may be used.

[0035] The above plant extract may utilize any part of the plant and is not limited to the extraction site. The preparation of the above plant extract is not limited by the form of the plant body, and includes all plant bodies that have undergone processing such as drying. For example, the plant may be the whole plant, roots, stems, leaves, fruits, flowers, shoots, branches, bark, sap, bulbils, and / or seeds of the aforementioned plant.

[0036] As used throughout this specification, the term "extract" has the meaning commonly used in the art to mean a crude extract as described above, but in a broader sense, it also includes fractions obtained by further fractionating the extract.

[0037] That is, the natural extract includes not only those obtained using an extraction solvent but also those obtained by additionally applying a purification process thereto. For example, fractions obtained through various additional purification methods, such as a fraction obtained by passing the extract through an ultrafiltration membrane having a specific molecular weight cut-off value, or separation by various chromatographs (designed for separation based on size, charge, hydrophobicity, or affinity), are also included in the natural extract of the present invention. Furthermore, it includes the extract itself and all formulations of extracts that can be formed using the extract, such as a diluted or concentrated extract of the extract, a dried product obtained by drying the extract, a modified or purified product of the extract, a fermented product of the extract, or a mixture thereof. Additionally, it includes a juice obtained by directly pressing or crushing and filtering a plant. The plant may be extracted as is or after processing.

[0038] The above "Poje" refers to a pharmaceutical technology that alters the original properties of medicinal materials by processing them based on traditional Korean medicine theory. Examples include the stir-frying method, which involves roasting the medicinal materials; the roasting method, which involves roasting the medicinal materials together with a certain amount of liquid auxiliary material to allow the auxiliary material to permeate into the medicinal tissue; and the steaming method, which involves adding and mixing liquid auxiliary material according to the Poje regulations for each medicinal item, heating and steaming it in a suitable container, or steaming it until it reaches a certain level and then drying it. Additionally, it may refer to the strain itself, the crushed material of the strain, its culture, its dead body, or a mixture thereof, extracted using an extraction solvent.

[0039] The term "fraction" as used in this invention refers to a result obtained by performing fractionation to separate a specific component or a specific group of components from a mixture containing various constituent components.

[0040] The natural extract used in the present invention can be prepared in a powder state by additional processes such as vacuum distillation, freeze-drying, or spray-drying.

[0041] In the terms used in this specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0042] As used in this specification, the term "active ingredient" means a component that exhibits the intended activity alone or can exhibit activity in combination with a carrier that is inactive itself.

[0043] Specifically, among the terms used in this specification, "containing as an active ingredient" means containing an amount sufficient to achieve the efficacy or activity of the following natural extracts.

[0045] In the present invention, a method for manufacturing short fibers using eucalyptus was completed.

[0046] A method for manufacturing eucalyptus staple fibers according to one embodiment of the present invention comprises: 1) a step of washing eucalyptus; 2) a step of sorting the washed eucalyptus; 3) a step of impregnating the sorted eucalyptus; and 4) a step of vaporizing the impregnated eucalyptus.

[0047] Step 1) above is a washing step for removing foreign matter from the wood, and the eucalyptus in Step 1) is selected from the group consisting of logs, sawn timber, wood pellets, wood chips, and mixtures thereof.

[0048] Step 2) above is a step for sorting out foreign substances that were not removed in the washing step.

[0049] Step 3) above is an impregnation step that is a preliminary step to facilitate the steam explosion step for manufacturing short fibers, and involves using an impregnation composition containing sodium hydroxide and sodium sulfate.

[0050] The above impregnation step is carried out at 20 to 30 ℃ for 1 to 12 hours.

[0051] The above impregnation composition comprises 1.0 to 3.0 wt% sodium hydroxide and 0.5 to 2.0 wt% sodium sulfate, preferably 1.5 to 2.5 wt% sodium hydroxide and 0.5 to 1.5 wt% sodium sulfate.

[0052] In addition, the above composition may further include natural extracts to improve the performance of short fibers.

[0053] The above natural extract may be a natural extract selected from the group consisting of paper mulberry extract, sea mustard extract, sea parsley extract, and mixtures thereof.

[0054] Preferably, the impregnation composition of the present invention is a natural extract selected from the group consisting of paper mulberry leaf extract, sea aster leaf extract, sea parsley leaf extract, and mixtures thereof.

[0055] When one or more extracts selected from the group consisting of paper mulberry extract, sea mustard extract, and sea parsley extract are additionally included, excellent tensile strength effects can be exhibited due to a higher synergistic effect resulting from the combined action of each extract.

[0056] Aurea helianthus is an annual herbaceous plant belonging to the genus Hibiscus, also known as wild hibiscus. As a medicinal plant listed in the *Compendium of Materia Medica*, it was restored and began to be cultivated in China; recently, seeds were introduced from China to Korea, and cultivation is now taking place domestically. By July or August, Aurea helianthus grows taller than a person, with flower heads typically 16 to 18 cm in diameter. The petals are pale yellow, the stamens are scarlet, and the leaves are dark blue and leaf-shaped. The flowers are harvested from late July, finely shredded, dried, and ground into powder to be used as a raw material for food, cosmetics, and tea. The leaves of Aurea helianthus also contain various bioactive substances and are utilized for a wide range of purposes.

[0057] Codium arabicum K The thallus of *C. tzing* is flattened, has irregularly rounded protrusions at the margins, has a wavy surface, feels slippery to the touch, is dark green, attaches firmly to the substrate via the creeping surface, and expands irregularly to a diameter of 2 to 6 cm. The cysts are club-shaped to cylindrical, with a slightly thickened and blunt apex, measuring 90 to 120 μm in diameter and 400 to 800 μm in length, and branch closely together at the base of the cysts. Hair cells are present at the apex of the cysts, and the gametocarps are ovate to spindle-shaped, measuring 40 to 70 μm in diameter and 150 to 300 μm in length. It is morphologically similar to *C. hubbsii* but is distinguished by the presence or absence of a honeycomb pattern at the apex.

[0058] Peucedanum japoincum Thunberg is primarily distributed in areas with well-developed soil along the southern coast, but it also grows in rock crevices on rocky shores. According to literature, there are records of its distribution in coastal sand dunes along the east and west coasts. The leaves are thick, divided into three lobes with irregular serrations, and both the leaves and roots are fragrant. The plant is small, measuring around 10 cm in height, while the flower stalks exceed 10 cm in size. White flowers bloom starting in the autumn, and after the flowers fade, the flower stalks remain dead.

[0059] The impregnation composition of the present invention comprises 1 to 10 parts by weight of *Paprika mulberry* extract, 1 to 10 parts by weight of *Cornus kousa* extract, and 1 to 10 parts by weight of *Pteris vernalis* extract, based on 100 parts by weight of an impregnation composition comprising sodium hydroxide and sodium sulfate; preferably, it may comprise 1 to 7 parts by weight of *Paprika mulberry* extract, 1 to 7 parts by weight of *Cornus kousa* extract, and 1 to 7 parts by weight of *Pteris vernalis* extract. More preferably, it may comprise 3 to 7 parts by weight of *Paprika mulberry* extract, 3 to 7 parts by weight of *Cornus kousa* extract, and 3 to 7 parts by weight of *Pteris vernalis* extract. When mixed and used within the above content ranges, a superior tensile strength effect can be provided due to the synergistic effect resulting from the mixing action of each extract.

[0060] The above natural extract is extracted using an extraction solvent selected from the group consisting of water, C1 to C6 lower alcohols, and mixtures thereof.

[0061] Specifically, to prepare a natural extract, a natural extract can be obtained by including the steps of: washing a natural material; drying it after washing; grinding the natural material after drying; and leaching the ground material using a solvent.

[0062] The method for preparing the above extract may be a conventional extraction method in the art, such as solvent extraction, hot water extraction, filtration, ultrasonic extraction, leaching, and reflux extraction, and these may be performed alone or in combination of two or more methods. In the present invention, the type of extraction solvent used for extraction is not particularly limited, and any solvent known in the art may be used.

[0063] Non-limiting examples of extraction solvents include water; lower alcohols having 1 to 6 carbon atoms, such as methanol, ethanol, propyl alcohol, and butyl alcohol; polyhydric alcohols, such as glycerin, butylene glycol, and propylene glycol; hydrocarbon solvents, such as methyl acetate, ethyl acetate, acetone, benzene, hexane, diethyl ether, and dichloromethane; or mixtures thereof. Specifically, water, lower alcohols, 1,3-butylene glycol, and ethyl acetate may be used individually or in a mixture of two or more. In this case, when two or more solvents are mixed, the mixing ratio between the solvents is not particularly limited.

[0064] Specifically, the extract may be obtained by extracting a natural product from which foreign substances have been removed by washing and drying with water, an alcohol having 1 to 6 carbon atoms, or a mixture of these solvents, and may be an extract obtained by sequentially applying the solvents to a sample.

[0065] For extraction, the sample may be left in an extraction solvent for leaching for 1 to 72 hours, and more specifically, for 24 to 48 hours.

[0066] In the present invention, the extraction method may be applied using a solvent with a weight of 1 to 100 times, specifically 1 to 50 times, more specifically 2 to 20 times, based on the weight of the dried plant material, at an extraction temperature of 10 to 80 ℃, specifically 15 to 50 ℃, for an extraction time of 2 hours to 30 days, specifically 12 hours to 18 days, and may include a process of obtaining a liquid crude extract by performing continuous extraction 1 to 5 times including the dried and crushed material.

[0067] The extract obtained using the above organic solvent may further include a step of fractionating using an organic solvent, and the method for preparing the extract may be a conventional extraction method in the art, such as ultrasonic extraction, leaching, and reflux extraction.

[0068] The above reflux extraction method is based on 100 mL of water and alcohol having 1 to 6 carbon atoms, 10 to 30 g of ground natural material, a reflux time of 1 to 3 hours, and 50 to 100% of alcohol having 1 to 6 carbon atoms or water. More specifically, based on 100 mL of alcohol having 1 to 6 carbon atoms or 100 mL of water, 10 to 20 g of ground natural material, a reflux time of 1 to 2 hours, and 70 to 90% of alcohol having 1 to 4 carbon atoms or water. Reflux extraction can be performed multiple times.

[0069] The above leaching method is carried out at 15 to 30°C for 24 to 72 hours, and water or 50 to 100% of an alcohol having 1 to 6 carbon atoms is used as the extraction solvent. More specifically, it is carried out at 20 to 25°C for 30 to 54 hours, and the extraction solvent is water or 70 to 80% of an alcohol having 1 to 6 carbon atoms.

[0070] The above ultrasonic extraction method is carried out at 30 to 50°C for 0.5 to 2.5 hours, and the extraction solvent is water or an alcohol having 1 to 6 carbon atoms in 50 to 100%. Specifically, the extraction is carried out at 40 to 50°C for 1 to 2.5 hours, and the extraction solvent is water or an alcohol having 1 to 6 carbon atoms in 70 to 80%.

[0071] The above extraction solvent may be used in an amount of 2 to 50 times the weight of the sample, more specifically 2 to 20 times. For extraction, the sample may be left in the extraction solvent for 1 to 72 hours, more specifically 24 to 48 hours.

[0072] After extraction, the extract can be fractionated by sequentially applying a new fractionation solvent. The fractionation solvent used for fractionation is one or more selected from the group consisting of water, hexane, butanol, ethyl acetic acid, ethyl acetate, methylene chloride, and mixtures thereof, preferably ethyl acetate or methylene chloride. After obtaining the extract or fraction, additional methods such as concentration or freeze-drying may be used.

[0073] Step 4) above is a steam explosion step for producing short fibers from wood, which involves treating at 180 to 230°C, 10 to 80 kg / cm², for 1 to 20 minutes. Preferably, it involves treating at 195 to 220°C, 20 to 50 kg / cm², for 1 to 20 minutes.

[0074] Step 5) following the vapor explosion step may additionally include a step of filtering the vapor-explosed solution into short fibers using various types of sieves or screens of 10 to 100 mesh and centrifugal washing, similar to the conventional Kraft method. The sieves include plastic sieves, stainless steel sieves, etc., and plastic sieves are mainly used.

[0075] After the step of filtering the solution and short fibers, a washing step may additionally be included in step 6). The washing step may be performed using any commercial type of washer, including a flat belt washer, rotary drum water, vacuum filter, washing press, compaction baffle filter, atmospheric diffuser, and pressure diffuser. The washing step may use a current opposite flow so that the short fibers move in the opposite direction to the washing water. In one embodiment, pressurized water of 0.5 to 5 kg / cm², preferably 1.5 to 3 kg / cm², is used to wash the short fibers.

[0076] A eucalyptus staple fiber according to another embodiment of the present invention is manufactured by the method for manufacturing the eucalyptus staple fiber.

[0077] Eucalyptus pulp according to another embodiment of the present invention comprises the eucalyptus staple fibers.

[0078] A method for manufacturing eucalyptus pulp according to another embodiment of the present invention comprises: 1) a step of immersing eucalyptus staple fibers manufactured by the method according to claim 1 in an active alkali solution; 2) a step of digesting the immersed eucalyptus active alkali solution; 3) a step of refining the digested eucalyptus active alkali solution; 4) a step of washing the refined eucalyptus; and 5) a step of sorting the washed eucalyptus.

[0079] Step 1) above is a step of immersing the short fibers in an active alkaline solution, which is a preliminary step to facilitate digestion for pulping, and the active alkaline solution is NaOH, Na2SO3, Mg(OH)2, etc., and preferably selected from the group consisting of Na2SO3, Mg(OH)2 and mixtures thereof.

[0080] The above immersion step involves adding 0.5 to 2% of Mg(OH)2 at a concentration of 5 to 20%, preferably 5 to 15%, based on the whole-dry weight of the short fiber, and completely immersing it at a temperature of 90 to 150°C for 5 to 40 minutes. Preferably, 1 to 1.5% of Mg(OH)2 is added based on the whole-dry weight of the short fiber, and completely immersing it at a temperature of 100 to 130°C for 5 to 20 minutes.

[0081] Step 2) above is a step of digesting short fibers to produce pulp, in which the immersed short fibers are digested using an autoclave at 121°C for 5 to 10 minutes.

[0082] Step 2) above further includes a step of rapid cooling to improve the strength and marketability of the pulp. Preferably, it may further include a step of rapid cooling the digested immersion liquid at -20 to 10°C for 5 to 30 minutes.

[0083] Step 3) above is a refining step in which the immersed short fibers are passed through a refiner with a bar spacing of 0.6 to 1.2 mm, and then passed through a 5 to 15 mesh wire.

[0084] Step 4) above is a washing step and may be performed using any commercial type of washer including a flat belt washer, rotary drum water, vacuum filter, washing press, compaction baffle filter, atmospheric diffuser, and pressure diffuser. The washing step may use a current opposite flow so that the pulp moves in the opposite direction to the washing water. In one embodiment, pressurized water of 0.5 to 5 kg / cm², preferably 1.5 to 3 kg / cm², is used for washing.

[0085] Step 5) above is a sorting step for separating fine foreign substances. Subsequently, it may additionally include a step of drying the paper-formed pulp from a drying level of 2% to 80% to form pulp.

[0087] The present invention will be explained in more detail below through the following examples. However, the following examples are merely illustrative of the present invention and do not limit the scope of the present invention. Effects of the invention

[0088] The present invention relates to a method for manufacturing short fibers using eucalyptus and short fibers manufactured according to the same. It can provide a method for manufacturing short fibers using eucalyptus and short fibers manufactured according to the same, which exhibit superior tensile strength effects due to the synergistic effect resulting from the chronological configuration of each step. Specific details for implementing the invention

[0089] Hereinafter, embodiments of the present invention are described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0091] [Preparation Example 1: Preparation of Natural Extract]

[0092] 1. Preparation of natural extracts

[0093] After washing, drying, and grinding the natural product, 90 to 95% ethyl alcohol was added as a solvent at a ratio of 1:10 (w:v), and then completely immersed. Afterward, extraction was performed at room temperature for 24 hours. After repeating the extraction a total of two times using the same method, the obtained extract was concentrated under reduced pressure, freeze-dried to prepare a powder sample, homogenized, and used in the experiment.

[0094] 2. Preparation of complex extract

[0095] To confirm the synergistic effect of mixing paper mulberry leaf extract (AE), sea mustard leaf extract (CE), and sea parsley leaf extract (PE), a complex extract was prepared according to the composition shown in Table 1 below.

[0096] M1 M2 M3 M4 M5 M6 M7 M8 AE 10 - - 1 3 5 7 10 CE - 10 - 1 3 5 7 10 PE - - 10 1 3 5 7 10

[0097] (Unit: parts by weight)

[0099] [Preparation Example 2: Method for manufacturing eucalyptus staple fibers]

[0100] Eucalyptus staple fibers of the present invention were manufactured by configuring each step as shown in Table 2 below.

[0101] EF1 EF2 EF3 EF4 EF5 EF6 EF7 EF8 EF9 1) 0 0 0 0 0 0 0 0 0 2) 0 0 0 0 0 0 0 0 0 3) 0 0(M1) 0(M2) 0(M3) 0(M4) 0(M5) 0(M6) 0(M7) 0(M8) 4) 0 0 0 0 0 0 0 0 0

[0102] (0 : Perform the corresponding step, - : Do not perform the corresponding step.)

[0103] Step 1) above is a step of washing eucalyptus in the form of wood chips.

[0104] Step 2) above is a step for sorting out foreign substances that were not removed in the washing step.

[0105] Step 3) above is a step of impregnating selected eucalyptus into an impregnation composition containing 2.0 wt% sodium hydroxide and 1.0 wt% sodium sulfate.

[0106] The above impregnation composition may further include the complex natural extract of Preparation Example 1.

[0107] Step 4) above is a step of steam-blasting the impregnated eucalyptus for 10 minutes under conditions of 210 ℃ and 50 kg / cm².

[0108] In order to manufacture the eucalyptus pulp of Manufacturing Example 3 below, which is manufactured to confirm the effect of the above eucalyptus staple fiber, steps 5) and 6) can be additionally performed chronologically after step 4).

[0109] Step 5) above is a step in which the vapor-blasted eucalyptus is filtered into short fibers using a 60 mesh plastic sieve.

[0110] Step 6) above is a step of washing the filtered short fibers under a water pressure of 2 kg / cm².

[0112] [Preparation Example 3: Method for preparing eucalyptus staple fiber pulp containing eucalyptus staple fibers]

[0113] Eucalyptus pulp was manufactured by configuring each step as shown in Table 3 below as a method for manufacturing eucalyptus pulp using eucalyptus staple fibers of the present invention.

[0114] EP1 EP2 EP3 EP4 EP5 EP6 EP7 EP8 EP9 EP10 1) 0 (EF1) 0 (EF2) 0 (EF3) 0 (EF4) 0 (EF5) 0 (EF6) 0 (EF7) 0 (EF8) 0 (EF9) 0 (EF7) 2-1) 0 0 0 0 0 0 0 0 0 0 2-2) - - - - - - - - - 0 3) 0 0 0 0 0 0 0 0 0 0 4) 0 0 0 0 0 0 0 0 0 0 5) 0 0 0 0 0 0 0 0 0 0

[0115] (0 : Perform the corresponding step, - : Do not perform the corresponding step.)

[0116] Step 1) above is a step of adding 1% of a 10% concentration Mg(OH)2 active alkali solution based on the whole dry weight of the short fiber to the washed short fiber prepared in Preparation Example 2 above, and immersing it at a temperature of 120°C for 10 minutes.

[0117] Step 2-1) above is a step of immersing the eucalyptus using an autoclave at 121°C for 7 minutes.

[0118] Step 2-2) above is a step of rapidly cooling the immersion solution at 4°C for 15 minutes.

[0119] Step 3) above is a step of refining the digested eucalyptus active alkali solution by adjusting the bar to 1 mm using a refiner and passing it through a 10 mesh wire.

[0120] Step 4) above is the step of washing the laminated eucalyptus under a water pressure of 2 kg / cm².

[0121] Step 5) above is a step of sorting the washed eucalyptus.

[0123] [Example 1: Tensile Strength Measurement]

[0124] EDANA20.2-89 was used to measure the tensile strength of the pulp. The strength was calculated and is shown in Table 4 below.

[0125] EP1 EP2 EP3 EP4 EP5 EP6 EP7 EP8 EP9 EP10 MD 1.8 2.0 1.9 1.9 2.1 2.3 2.5 2.4 2.2 2.7 CD 0.9 1.0 1.1 1.1 1.2 1.3 1.5 1.4 1.2 1.6

[0126] (Unit: kg / 5cm)

[0127] As shown in Table 4 above, it was confirmed that EP2 to EP9, which additionally contain natural extracts, exhibited improved tensile strength compared to EP1, which does not contain natural extracts.

[0128] Specifically, EP2 to EP4, each containing extracts of *Paprika mulberry*, *Cornus officinalis*, and *Pteris vernalis*, showed slightly improved tensile strength compared to EP1, and EP5 to EP9, each containing extracts of *Paprika mulberry*, *Cornus officinalis*, and *Pteris vernalis*, showed superior tensile strength. In particular, EP6 to EP8 showed superior tensile strength.

[0129] In addition, it was confirmed that EP10, which includes a step of rapidly cooling the digested immersion liquid in the pulp manufacturing process, exhibits superior tensile strength compared to the best EP7.

[0131] [Example 2: Measurement of Sensory Ability]

[0132] In order to evaluate the palatability of the eucalyptus pulp prepared according to the above Preparation Examples 1 to 3, EP1 to EP10 were prepared, provided to 50 adult men and women aged 20 to 60, and then asked to evaluate the aesthetics, texture, and scent using an index of 1 to 10.

[0133] The above evaluation scores were requested to be 1 to 10 points per item. For relative evaluation, EP1 of Manufacturing Example 1 of the present invention was fixed at an index of 3 to evaluate relative index values. The results were aggregated, averaged, and rounded to the second decimal place and shown in Table 5 below. The higher the index below, the better the preference.

[0134] EP1 EP2 EP3 EP4 EP5 EP6 EP7 EP8 EP9 EP10 aesthetics 3 3 3.1 3 3.2 3.3 3.4 3.3 3.1 3.4 touch 3 3.2 3.2 3.1 3.2 3.5 3.8 3.7 3.4 4 incense 3 4 4.2 4.3 4.8 5.7 7.1 6.6 5.5 7.4 Overall preference 3.0 3.4 3.5 3.5 3.7 4.2 4.8 4.5 4.0 4.9

[0135] (Unit: Index)

[0136] As shown in Table 5 above, it was confirmed that EP2 to EP9, which additionally contain natural extracts, exhibited improved sensory properties compared to EP1, which does not contain natural extracts.

[0137] Specifically, EP2 to EP4, each containing extracts of *Paprika mulberry*, *Cornus officinalis*, and *Pteris vernalis*, showed slightly improved aesthetics, texture, and scent compared to EP1, while EP5 to EP9, each containing extracts of *Paprika mulberry*, *Cornus officinalis*, and *Pteris vernalis*, showed superior tensile strength and sensory properties. In particular, EP6 to EP8 were confirmed to exhibit superior aesthetics, texture, and scent.

[0138] In addition, it was confirmed that EP10, which includes a step of rapidly cooling the digested immersion liquid in the pulp manufacturing process, exhibits the best palatability.

[0140] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical spirit or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0141] The scope of the present invention is defined by the claims set forth below, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention.

Claims

Claim 1 A method for manufacturing eucalyptus staple fibers comprising: 1) a step of washing eucalyptus; 2) a step of sorting the washed eucalyptus; 3) a step of impregnating the sorted eucalyptus with an impregnation solution composition comprising sodium hydroxide, sodium sulfate, paper mulberry extract, sea mustard extract, and sea parsley extract; and 4) a step of vaporizing the impregnated eucalyptus. Claim 2 delete Claim 3 A method for manufacturing eucalyptus staple fibers according to claim 1, wherein the steam explosion step is performed for 1 to 20 minutes under conditions of 180 to 230 ℃ and 20 to 40 kg / cm². Claim 4 Eucalyptus staple fibers manufactured by the manufacturing method according to paragraph 1 or 3. Claim 5 Eucalyptus pulp containing eucalyptus staple fibers according to paragraph 4. Claim 6 A method for manufacturing eucalyptus pulp comprising: 1) a step of immersing eucalyptus staple fibers produced by the manufacturing method according to claim 1 in an active alkaline solution; 2) a step of digesting the immersed eucalyptus active alkaline solution; 3) a step of refining the digested eucalyptus active alkaline solution; 4) a step of washing the refined eucalyptus; and 5) a step of sorting the washed eucalyptus. Claim 7 A method for manufacturing eucalyptus pulp according to claim 6, wherein step 2) further includes a rapid cooling step.