WO2020004843A1 - Nonwoven fabric assembly and sheet mask using same - Google Patents

Abstract

The present invention relates to a nonwoven fabric assembly and a sheet mask using same and, specifically, to: a nonwoven fabric assembly, which has excellent bending characteristics for a use in an industrial material, having a pleasant feel and a soft sheen for a use in clothes or interior decoration, having excellent physical properties such as transparency, skin adhesiveness, absorbency of solvent such as water, and maintenance and a smooth surface feeling for a use in a sheet mask nonwoven fabric assembly, and comprises a lyocell fiber having a large specific surface area; and a sheet mask using the nonwoven fabric assembly.

Description

 2020/004843 1 »（： 1 ^ 1 {2019/007218

[Explanation of invention]

 [Name of invention]

 Nonwoven Fiber Assembly and Mask Pack Sheet Using Same

 Technical Field

Cross Citation with Related Application (s)

 This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0075232 dated June 29, 2018, and all contents disclosed in the documents of the Korean patent applications are included as part of this specification.

 The present invention relates to a nonwoven fabric assembly comprising lyocell fibers and a mask pack sheet using the same.

 [Technique to become background of invention]

 Fiber refers to a natural or artificial linear object that is flexible and thin in shape and has a large ratio of length to thickness. These fibers are divided into long fibers, brisket fibers and short fibers in terms of their shape, and are divided into natural fibers and artificial fibers in terms of raw materials.

 Formerly, fiber was closely related to human life, and natural fibers such as cotton, hemp, wool, and silk were used as the main raw materials for the coating. With the development of science and technology after the Industrial Revolution, textiles have expanded their use not only for coating materials but also for industrial purposes, and the field of artificial textiles has emerged as a new textile material to meet the demand for rapidly increasing fibers with the development of culture and population growth. Pioneered.

The regenerated fibers in these artificial fibers not only have excellent touch and fit, but also have a much faster moisture absorption and discharge capacity than cotton, and thus have been widely used as raw materials for coating. In particular, among such recycled fibers, rayon fibers have excellent gloss and color development and can realize a touch equivalent to that of natural fibers, and have been widely used in the past because they are recognized as harmless materials to humans. However, these rayon fibers had properties of materials that shrink and wrinkle well, and many chemicals are used in the manufacturing process and the process of melting wood pulp. 2020/004843 1 »（： 1 ^ 1 {2019/007218

In the process of wastewater treatment, there was a problem causing environmental pollution. Accordingly, researches on fibers that are harmless to the environment and human body and that have physical properties superior to those of other fibers have been conducted. Recently, lyocell (1 method 61 1) fibers manufactured from natural pulp and amine oxide hydrate have been introduced. These lyocell fibers have superior tensile properties and tactile properties compared to conventional recycled fibers, and do not generate any contaminants in the production process, and the amine oxide solvents used are recyclable and biodegradable when disposed. As an eco-friendly fiber, it is used in various fields. However, the current lyocell fiber can produce only products having a circular cross-section, and it is expected that the lyocell fiber may exhibit various physical properties according to the cross-sectional shape of the lyocell fiber. In addition, Japanese Patent Laid-Open Publication No. 2009-540140 discloses a technique related to a nonwoven fiber assembly including lyocell fibers.

 However, even if such a technique is used, there is a problem that the specific surface area due to the increase in the space occupancy does not increase, and various properties such as bulging properties, interfacial adhesion properties, and quick drying properties are not excellent.

 [Content of invention]

 [Task to be solved]

 The present invention is to provide a nonwoven fiber assembly having excellent physical properties such as excellent bending properties, good feel and soft gloss properties, transparency, skin adhesion, moisture absorption and retention, such as moisture, smooth surface feel. In addition, the present invention is to provide a mask pack sheet excellent in transparency, skin adhesion, solvent absorption and retention, smooth surface feel using the nonwoven fiber assembly.

 [Measures of problem]

In the present specification, a lyocell fiber prepared by spinning a lyocell spinning dope comprising a cellulose pulp and a 1methylmorpholine-oxide aqueous solution, and the cross-section of the lyocell monofilament included in the lyocell fiber, Wherein the plurality of protrusions comprise a virtual first circle 2020/004843 1 »（： 1 ^ 1 {2019/007218

And a nonwoven fabric which is in contact with a virtual second circle included in the virtual first circle, and is integrally formed with the virtual second circle as a center and whose end is in contact with the virtual first circle. Fiber aggregates are provided.

 In addition, in the present specification, a mask pack sheet using the nonwoven fiber assembly is provided.

 Hereinafter, a nonwoven fiber assembly and a mask pack sheet using the same according to specific embodiments of the present invention will be described in detail.

In this specification, the first and second terms are used to describe various components, which terms are only used to distinguish one component from another component.

 According to one embodiment of the invention, comprising a lyocell fiber prepared by spinning a lyocell spinning dope comprising a cellulose pulp and an aqueous solution of methyl morpholine-oxide, cross section of the lyocell monofilament contained in the lyocell fiber Silver and a plurality of projections, the plurality of projections are in contact with the virtual second circle included in the virtual first circle and the virtual first circle, the virtual second circle to the center A nonwoven fiber assembly may be provided that is integrally formed and has a shape whose ends contact the imaginary first circle.

The lyocell (61 1) fiber is made from natural pulp and amine oxide hydrate, and may have fiber properties such as excellent tensile properties and feel compared to conventional recycled fibers. In addition, the lyocell fiber corresponds to a hydrophilic material, and the lower the fineness, the higher the specific surface area, the better the water saw force, and when impregnated with a liquid composition such as moisture and essence in the nonwoven fiber assembly including the lyocell fiber. As a result, the absorbency of the nonwoven fiber assembly may be increased, and the holding force of the liquid composition in the nonwoven fiber assembly may be increased. However, conventional lyocell fibers can only produce products with a circular cross section, and lyocell fibers with a circular cross section do not have an effect of increasing specific surface area, and thus have excellent properties such as bulging, interfacial adhesion, and quick drying characteristics. Not 2020/004843 1 »（： 1 ^ 1 {2019/007218

There is a problem. In order to solve the above problems, the present inventors have provided a nonwoven fiber assembly including lyocell fibers having a large specific surface area to provide physical properties that could not be provided in a nonwoven fiber assembly including lyocell fibers of a conventional circular cross section. It was confirmed that the present invention can be achieved, and the present invention was completed.

옥사이드 수용액을 포함하는 라이오셀 방사 도프를 방사하여 제조되며, 특히, 메틸모폴린- 옥사이드 수용액을 사용함으로 인해 라이오셀 방사 도프에서 셀룰로오스 펄프를 보다 용이하게 용해시키는 효과가 있다는 점을 확인하였다. In addition, the lyocell fibers contained in the nonwoven fiber assembly is a cellulose pulp and

It was prepared by spinning a lyocell spinning dope containing an aqueous solution of oxide, in particular, it was confirmed that the effect of dissolving cellulose pulp more easily in the lyocell spinning dope due to the use of aqueous solution of methyl morpholine-oxide.

 Furthermore, the nonwoven fiber assembly can be used for industrial materials because of its excellent bending properties, it can be used for clothing or interiors because of its good texture and soft gloss, and it can absorb and maintain solvents such as transparency, skin adhesion, moisture, Due to its excellent physical properties such as smooth surface feel, it can be used for mask pack nonwoven fiber aggregate applications. The lyocell fiber included in the nonwoven fiber assembly according to the embodiment includes at least one lyocell multifilament, and such lyocell multifilament may comprise at least one lyocell monofilament. The lyocell monofilament may have a release cross section (1111 ^ 1½1), and specifically, the release cross section means a shape including a plurality of protrusions 2.

 1 is a view schematically showing the cross-section of the lyocell monofilament, according to this, the release cross-section of the lyocell monofilament, a plurality of protrusions (2) formed integrally with respect to one central part (1) Can have shape

Specifically, the release cross section includes a virtual first circle 11 connecting the end points of each of the plurality of protrusions 2 and a virtual second circle 12 contained within the virtual first circle 11. Its size and shape can be defined within the range of. At this time, the 2020/004843 1 »（： 1 ^ 1 {2019/007218

The virtual first circle 11 and the virtual second circle 12 are circles in which the virtual first circle 11 has a larger radius than the virtual second circle 12, and the virtual first circle 11. The circle and the second circle may be the same center.

 The release cross section includes a plurality of protrusions 2, the plurality of protrusions 2 being formed integrally with the central portion 1 overlapping with the virtual second circle 12, the ends of each protrusion ( 5) may be in contact with the virtual first circle 11, and the concave portion 4 formed between the projections may have a shape in contact with the virtual second circle 12.

 In addition, in order to maximize the specific surface area of the lyocell fiber, the release cross section may include two or more, three or more or three protrusions.

 The virtual first circle 11 may have a radius of 6.0 to 7.8_, 6.5 to 7.7, or 7.0 to 7.5_. If the radius of the virtual first circle is less than 6.0, it is impossible to implement a cross-sectional shape, and if it is more than 7. Sm, it may be difficult to form a monofilament having a fineness suitable as a fiber product.

경우 섬유제품으로서 적합한 섬도를 가지는 모노 필라멘트를 형성하기 어려울수 있다. Meanwhile, the virtual second circle 12 may have a radius of 1.8 to 2.1. If the radius of the virtual second circle is less than 1.8 / year, it is impossible to implement a heteromorphic cross-sectional shape,

It can be difficult to form monofilaments with fineness suitable as textile products.

 Due to the lyocell monofilament having a release cross section as described above, the lyocell fiber may have a space occupancy of 150 to 300% or 150 to 200% defined by Equation 1 below.

 ásik 1 ñ

 Space occupancy (%) = (area of virtual first circle / cross sectional area of lyocell monofilament) X 100

The space occupancy refers to the proportion of space that the monofilament actually occupies in the fiber due to the plurality of protrusions of the release cross section. That is, when the cross section of the monofilament included in the lyocell fiber is a circular cross section, the cross-sectional area of the actual monofilament and the area of the virtual first circle are the same. 2020/004843 1 »（： 1 ^ 1 {2019/007218

The space occupancy is defined as 100%. However, in the case of the lyocell fiber having a release cross section including a projection, the actual area occupied by the fiber is increased by the projection. Therefore, as the space occupancy increases, the specific surface area of the fiber increases.

틸모폴린- 옥사이드 수용액을 포함하는 라이오셀 방사도프를 방사하여 제조된 섬유이다 . In addition, the lyocell fiber that satisfies the above-mentioned space occupancy may have various properties such as bloating property, interfacial adhesion property, and quick-drying property due to the increased specific surface area. The lyocell fibers contained in the nonwoven fiber assembly according to the embodiment, the cellulose pulp and

It is a fiber produced by spinning a lyocell spinning dope containing an aqueous solution of tylmorpholine-oxide.

 Since the lyocell island is prepared by spinning the lyocell spinning dope containing methyl morpholine-oxide, there is an effect of dissolving cellulose pulp more easily in the lyocell spinning dope.

옥사이드 수용액 84 내지 94 중량%를 포함할 수 있다. 예를 들어， 상기 셀룰로오스 펄프 및 -메틸모폴린- 옥사이드 수용액의 중량비는 6 : 94 내지 16 : 84， 8 : 92 내지 14 : 86 내지 10： 90 내지 12 : 88일 수 있다. Specifically, the lyocell spinning dope is 6 to 16% by weight of cellulose pulp; And

It may include 84 to 94% by weight of the aqueous oxide solution. For example, the weight ratio of the cellulose pulp and -methyl morpholine-oxide aqueous solution may be 6: 94 to 16: 84, 8: 92 to 14: 86 to 10: 90 to 12: 88.

 In the lyocell spinning dope, if the content of cellulose pulp is too small, it is difficult to realize the fibrous characteristics, and if the content of cellulose pulp is too high, it may be difficult to dissolve in the aqueous phase. In addition, in the lyocell spinning dope, if the content of the -methylmorpholine-oxide aqueous solution is too small, there is a problem in that the dissolution viscosity is greatly increased. It can be difficult to produce uniform fibers at.

In addition, the cellulose pulp may have an alpha-cellulose content of 85 to 97% by weight, 89 to 95% by weight, or 92 to 94% by weight. In addition, the degree of polymerization of the cellulose pulp (卵 is 600 to 1700, 700 to 1600, or 800 2020/004843 1 »（： 1 ^ 1 {2019/007218

To 1300.

 In the methyl morpholine-oxide aqueous solution, the weight ratio of -methyl morpholine-1 oxide and water may be 93: 7 to 85:15. When the weight ratio of ^ methylmorpholine oxide and water is greater than 93: 7, the dissolution temperature is increased, so that decomposition of cellulose may occur when the cellulose is dissolved, and when the weight ratio is less than 85:15, the dissolution performance of the solvent is deteriorated. May be difficult to dissolve.

 The lyocell fiber prepared by spinning the lyocell spinning dope described above may be manufactured in the form of staple short fibers, which is important for mask packs, such as skin adhesion, essence absorption and holding power, soft texture, and the like. Very good compared to the material, it can be used in nonwoven fiber aggregates for mask packs.

 The fineness of the lyocell fiber may be 1.0 to 1.5 denier. If the fineness of the lyocell fiber is less than 1.0 denier, it is difficult to manufacture the lyocell fiber, and if the fineness exceeds 1.5 denier, it is not a characteristic because it is a general fineness applied to the mask pack, and there is no characteristic such as skin adhesion or essence absorption power. This represents a general level.

As the fineness is to be defined by the following formula 2, the density of the actual lyocell monofilament cross section and lyocell fibers obtained through the analysis section (for八1.49: it said ²⁾ obtained using a.

 <Equation 2 ñ

Fineness (¾) = [monofilament cross-sectional area of lyocell fiber (/ ² ) X density of lyocell fiber ( _§ / 011 ³ ) X 9000 (111) 1/1000000

 In addition, the lyocell fiber is a staple fiber, the fiber length (織 維 長) may be 36 to 40_ days, or 37 to 3¾ pad. When the lyocell fibers are used as the nonwoven fiber aggregate within the fiber length range, fairness in the carding process of the nonwoven fiber aggregate manufacturing process may be excellent.

In addition, the crimp number of the lyocell fiber may be 5 to 2 or 8 to 12. If the number of crimps is too small, nonwoven fiber assembly 2020/004843 1 »（： 1 ^ 1 {2019/007218

In the carding process during the manufacturing process is low inter-fiber entanglement process problems, if too many crimps, the carding process of the non-woven fiber assembly manufacturing process is not good.

 In addition, the lyocell fiber may have an emulsion content of 0.1 to 0.4 wt%, or 0.2 to 0.3 wt%. When the emulsion satisfies the weight% range, the filament to be described later to reduce the friction generated in the process of forming the crimp tow, can form a good crimp between fibers, and also good carding properties when manufacturing the nonwoven fiber assembly can do. Since the nonwoven fiber assembly of the embodiment including the lyocell fibers has a thin thickness of the nonwoven fiber assembly compared to the general circular cross-sectional fibers at the same unit weight, when used in a mask pack, the nonwoven fiber assembly has a soft feel when dipped into a cosmetic solvent such as an essence. It can be transparent and have very good skin adhesion.

 In addition, the specific surface area of the lyocell fibers included in the nonwoven fiber assembly is larger than the circular cross-sectional fibers of the same fineness, and when used in the mask pack, the essence holding power is also excellent because the absorbency for solvents such as essence is high. It can show a great effect compared to the material.

35 내지 55요/111² 또는 40 내지 50용細²일 수 있다. 또한, 부직 섬유 집합체의 두께는On the other hand, the basis weight of the nonwoven fiber assembly is 30 to

35 to 55 yaw / 111 ² or 40 to 50 細² . In addition, the thickness of the nonwoven fiber assembly is

0.3 to 0.6, 0.35 to 0.58, or 0.4 to 0.55_. The thickness of the nonwoven fiber assembly is a physical property that depends on the shortness of the staple fibers and the basis weight of the nonwoven fiber assembly. The lower the shortness of the staple fibers, the smaller the basis weight of the nonwoven fiber assembly, the thinner the thickness may be. The basis weight and thickness range is an optimal range for improving the water absorption, transparency and adhesion of the liquid composition in the nonwoven fiber assembly comprising the lyocell fibers satisfying the fineness, fiber length, crimp number, emulsion content of the lyocell fibers Means.

In addition, the nonwoven fiber assembly has a water absorption of 1000 to 1600%, 2020/004843 1 »（： 1 ^ 1 {2019/007218

1100 to 1600%, or 1300 to 1600%. As described above, the lyocell fiber has a higher water absorption than other fibers corresponding to hydrophilicity, but satisfies the basis weight and thickness range of the nonwoven fiber assembly while satisfying the characteristics of the lyocell fiber. The water absorption of the nonwoven fiber assembly comprising a can be absorbed in accordance with the above range.

 In addition, the nonwoven fiber assembly may be 80 to 84% transparency after the water treatment, 88 to 94% transparency after the essence treatment. The transparency of the nonwoven fiber aggregate corresponds to the fineness of the lyocell fibers with a fineness of 1.0 to 1.4 denier, and the thickness of the nonwoven fiber aggregate including the lyocell fibers is also thinned, so that the liquid composition such as moisture and essence may be used. Treatment with the nonwoven fiber assembly can have a soft feel and transparency within the range of the transparency. On the other hand, the moisture or essence treatment on the nonwoven fiber aggregate means that the nonwoven fiber aggregate is supported or immersed in a liquid composition such as water or essence.

 In addition, the non-woven fiber assembly may be a skin adhesion after the moisture treatment for 3.6 to 4.2, the skin adhesion after the essence treatment may be 4.5 to 5.3. The skin adhesion of the nonwoven fiber assembly also satisfies the characteristics of the lyocell fibers, and may satisfy the above range by the basis weight and thickness of the nonwoven fiber assembly including the same. On the other hand, the moisture or essence treatment on the nonwoven fiber aggregate means that the nonwoven fiber aggregate is immersed in or immersed in a liquid composition such as water or essence, and the skin adhesion force adheres the moisture or essence treated nonwoven fiber aggregate to human skin. After measuring the adhesive force appearing while shaking off.

In addition, the nonwoven fiber assembly has an emulsion content of ¾ ^, prewoven fiber assembly.

It may be 0.001% by weight or less relative to 100% by weight. The nonwoven fiber assembly may exhibit such a content as most of the emulsion contained in the lyocell fibers is washed away during acceptance of the spunlace process in the nonwoven fiber assembly manufacturing process. 2020/004843 1 »（： 1 ^ 1 {2019/007218

According to another embodiment of the present invention, a mask pack sheet using the nonwoven fiber assembly is provided.

 As described above, since the nonwoven fiber assembly has high absorption and retention power to solvents such as moisture or essence, and high transparency and skin adhesion even after solvent treatment such as moisture or essence, the mask pack sheet using the nonwoven fiber assembly is, Transparency, skin adhesion, essence absorption and retention, soft touch, etc., which are the most important physical properties of the mask pack sheet, have an excellent effect compared to other materials.

In addition, the mask pack sheet is not only excellent in the skin adhesion and fit even in the face area with a lot of bending, it is also excellent in the absorption of liquid compositions such as moisture and essence can effectively supply nutrition to the face. The method for preparing the nonwoven fiber aggregate may be a method for preparing a nonwoven fiber aggregate, which is generally known, and specifically, (i) spinning a lyocell spinning dope comprising a cellulose pulp and an aqueous solution of methylmorpholine-1 oxide; ½2) solidifying the lyocell spinning dope spun in step (a) to obtain lyocell multifilament; ½3) washing the lyocell multifilament obtained in step 02); And (34) emulsifying the lyocell multifilament washed in step (83); ½5) stuffing the lyocell multifilament emulsified in step (34) above

 Drying and cutting the crimp tow obtained in step 5) to obtain lyocell staple fibers; And comparing 7) the lyocell staple fiber obtained in the above 6) step into a nonwoven fiber assembly.

 [(Step)

01) is a step of spinning a lyocell spinning dope containing cellulose pulp and -methyl morpholine-oxide aqueous solution, the lyocell spinning dope 2020/004843 1 »（： 1 ^ 1 {2019/007218

The content / weight ratio of the cellulose pulp and aqueous methylmorpholine-oxide solution, the content of alpha-cellulose, the degree of polymerization of the cellulose pulp, and the water content in the aqueous solution of -methylmorpholine-oxide are described in the nonwoven fiber assembly of the above-described embodiment. As shown.

 The spinning of the lyocell spinning dope may be performed while the lyocell spinning dope is discharged from the spinning nozzle of the spinneret, and the spinning dope discharged from the spinning nozzle may have a filament shape. At this time, the spinneret may serve to discharge the spinning dope on the filament into the coagulation liquid in the coagulation bath through the air ¾ section. Discharging the spinning dope from the spinneret may be performed at a spinning temperature of 80 to 130.

 The spinneret may be a spinneret in which a plurality of unit holes are formed when a plurality of holes are set as one unit hole. In this case, the number of the plurality of holes included in the unit hole may be equal to the number of protrusions of the release cross section. For example, in order to manufacture a lyocell fiber including a monofilament having a release cross section including three protrusions, the number of holes included in the unit hole may be three.

 [(52) Steps]

응고단계; 및 1차 응고된 방사도프를 응고액에 담그어 응고시키는 2차응고단계를포함할수 있다. The ratio 2) is a step of coagulating the lyocell spinning dope spun in the step (a) to obtain a lyocell multifilament. The solidification of the step 2) is to supply cooling air to the spinning dope to coagulate.

Coagulation step; And a second coagulation step of dipping the first coagulated spinning dope in a coagulating solution.

In the step (), after the spinning dope is discharged through the spinneret, it can be passed through the air gap section of the space between the spinneret and the coagulation bath. In the air gap section, cooling air is supplied from the air cooling unit located inside the donut-shaped mold to the inside of the mold and to the outside, which is primarily solidified by the size (111611 <: 11) for supplying the cooling air to the spinning dope. Can be. 2020/004843 1 »（： 1 ^ 1 {2019/007218

At this time, the factors affecting the properties of the lyocell multifilament obtained in step 2) are the temperature and wind speed of the cooling air in the air gap section, and the solidification of the step 2) is a temperature of 4 to 15 ° C and a 5 to 10111. The cooling air having a wind speed of / 3 may be supplied to the spinning dope to solidify.

초과이면 냉각 공기에 의한 1차 응고가 충분히 되지 않아 방사 공정성이 좋지 않게 된다. If the temperature of the cooling air during the first solidification is less than 4 ^° 0, the surface of the detention cools, the cross section of the lyocell multifilament is uneven and the radiation processability is not good

If it exceeds, primary solidification by cooling air will not become enough and spinning processability will become bad.

 In addition, if the air velocity of the cooling air during the first solidification is less than 八八, the primary solidification by the cooling air is not sufficient, so that the radiation fairness is not good, and the trimming occurs. By shaking, the spinning processability becomes poor.

의한 1차응고후, 상기 방사도프는응고액이 담겨 있는 응고조에 공급되어 2차 응고가 진행될 수 있다. 한편， 적절한 2차 응고의 진행을 위해, 상기 응고액의 온도는

이하일 수 있다. 이는 2차 응고 온도가 필요 이상으로 높지 않아응고 속도가 적절히 유지되도록 하기 위한 것이다. 여기서 상기 응고액은 본 발명이 속하는 기술분야에서 통상의 조성으로 제조하여 사용할수 있으므로 특별히 한정되지 않는다.

After the first solidification, the spinning dope is supplied to the coagulation bath containing the coagulation liquid may be secondary coagulation. On the other hand, for the proper progress of secondary coagulation, the temperature of the coagulation liquid is

It may be: This is to ensure that the solidification rate is properly maintained because the secondary solidification temperature is not too high. Here, the coagulating solution is not particularly limited because it can be prepared and used in a conventional composition in the technical field to which the present invention belongs.

 [03) step]

 Step 3) is a step of washing the lyocell multifilament obtained in step 02).

 Specifically, after introducing the lyocell multifilament obtained in the step 2) to the traction roller, it can be washed by introducing into the washing bath.

 In the washing step of the filament, in consideration of the ease of recovery and reuse of the solvent after washing, it is possible to use a water washing solution of 0 to 1001 temperature, water may be used as the washing liquid, and other additions as necessary It may further include the component.

 [54 steps]

Step 4) comprises the lyocell multifilament washed in step 3). 2020/004843 1 »（： 1 ^ 1 {2019/007218

As the step of tanning, it can be dried after tanning.

 The tanning process is a form in which the lyocell multifilament is completely submerged in the emulsion and buried, and the amount of oil applied to the filament can be kept constant by the weaving rollers attached to the entry roll and the release roll of the tanning apparatus. The emulsion can reduce the friction that occurs when the filament is in contact with the drying roller and the guide, the crimp step, and allows the cream to form well.

 [Step S5]

 Step 55 is a step of cr impinging the lyocell multifilament treated with the emulsion in step S4 to obtain a cr imped Uw.

 Crimping is a process of imparting crimp to a multifilament. Specifically, crimping can be performed using a stuffer box to obtain 8 to 12 crimps per inch.

 In the step (S5) may be to supply steam to the lyocell multifilament and to crimp by applying pressure.

Specifically, the lyocell multifilament is passed through a steam box (Steam box), the steam is 0.1 to l. Okgf 八: fed to m ² to raise the temperature and moisture of the multifilament, and then crimped using a press roller (Press Rol ler) at a pressure of 1.5 to 3.0kg "cm ² to form a crimp in the stopper box.

At this time, if the steam supply amount is less than 0.01 kgf / cm ^{2, the} crimp is not formed smoothly. If the steam supply is more than 1.0 kgf / cm ^2, the temperature in the stopper box rises to 120 ^° C or more, and the filaments stick together to pass through the stopper box. You may not be able to. In addition, if the pressure for pressing the pressing roller is less than 1.5 kgf / cm ^{2 The} desired number of crimps are not formed, if the pressure exceeds 3.0kgf / cm ^{2 the} pressing force is too strong, this too filament may not pass through the stopper box.

 [(S6) step]

 Step 56 is a step of obtaining a lyocell staple fiber by drying and cutting the crimp tow obtained in the step (S5).

The crimp tow is dried using a Latt i ce dryer and cut 2020/004843 1 »（： 1 ^ 1 {2019/007218

Through the process, lyocell staple fibers can be formed.

 [37 steps]

 Step 7) is a step of preparing the lyocell staple fibers obtained in step 6) into a nonwoven fiber assembly.

 The lyocell staple fibers can be interlaced by carding and spunlacing to produce nonwoven fiber assemblies.

 【Effects of the Invention】

 According to the present invention, it is possible to exhibit the physical properties that could not be provided in the conventional non-woven fiber aggregates containing lyocell fibers of circular cross-section, it is used for industrial materials because of the excellent bending characteristics, good texture and soft gloss characteristics Due to its excellent physical properties such as clothing, interior use, transparency, skin adhesion, solvent absorption and retention such as moisture, and smooth surface feel, it provides nonwoven fabric assembly and mask pack sheet using it for mask pack nonwoven fabric assembly. can do.

 【Brief Description of Drawings】

 1 is a view schematically showing a cross section of the lyocell monofilament included in the nonwoven fiber assembly according to the embodiment.

Figure 2 (3) is a photograph taken a cross section of the lyocell fibers prepared according to Preparation Example 1, Figure 2 (I ₎ ) is a photograph taken a cross section of the lyocell fibers prepared according to Preparation Example 2, Figure 2 (is a photograph taken a cross section of the lyocell fiber prepared according to Production Example 3.

 [Specific contents for carrying out invention]

 Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention in more detail, it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples.

<Production example>

Preparation Example 1 2020/004843 1 »（： 1 ^ 1 {2019/007218

The degree of polymerization (large) 820, cellulose pulp with an alpha cellulose content of 93.9% was added to a methyl morpholine- ^ oxide / ¾0 mixed solvent with a propylgallate content of 0.01% by weight in a 90: 10 weight ratio (cellulose pulp: methylmorpholine-oxide). / ¾0 mixed solvent) to prepare a spinning dope for producing lyocell fibers with a concentration of 12% by weight.

First, the spinning nozzle of the spinneret having a plurality of unit holes including three holes was prepared, and the spinning temperature of the spinning dope was maintained at 110 ° C. in the spinning nozzle, and the single fineness of the lyocell monofilament was 1.2. Spinning was performed by adjusting the discharge amount and spinning speed of the spinning dope so as to be denier. The lyocell multifilament was manufactured by supplying the spinning dope on the multifilament discharged from the spinning nozzle to the coagulating liquid in the coagulation bath through the air gap section. At this time, in the air gap section, the spinning dope on the multifilament was first solidified with cooling air having a temperature of 8 ^° 0 and a wind speed of 1001 八. On the other hand, the coagulating solution used was a temperature of 25 ^° (：), the concentration of 85% by weight of water and 15% by weight of methyl morpholine oxide.

The lyocell multifilament stretched in the air layer through the towing roller is washed by the washing liquid sprayed from the washing machine to remove the remaining 1methylmorpholine oxide, and the oil is uniformly applied to the lyocell multifilament. The content was maintained at 0.2% and dried at 150 ^{° on} a drying roller to prepare lyocell fibers comprising multifilaments made of monofilament having a heteromorphic cross section including three protrusions. Preparation Example 2

A lyocell fiber comprising a multifilament made of a monofilament having a release cross section including three protrusions was produced in the same manner as in Production Example 1, except that the monofilament of the lyocell monofilament was 1.4 denier. It was. Preparation Example 3 2020/004843 1 »（： 1 ^ 1 {2019/007218

A lyocell fiber comprising a multifilament made of a monofilament having a release cross section including three protrusions was manufactured in the same manner as in Preparation Example 1, except that the monofilament of the lyocell monofilament was 1.5 denier. It was. Preparation Example 4

 A lyocell fiber comprising a multifilament made of a monofilament having a release cross section including three protrusions was produced in the same manner as in Production Example 1, except that the monofilament of the lyocell monofilament was 2.5 denier. It was. Preparation Example 5

 Production example, except that the single hole is used as a unit hole, the spinneret having a plurality of unit holes is used, and the air quenching wind speed is 15 m / s so that the single fineness of the lyocell monofilament is 1.5 denier. In the same manner as in 1, a lyocell fiber comprising a multifilament consisting of a monofilament having a circular cross section having a diameter of 11.93_ was prepared. Preparation Example 6

A lyocell fiber comprising a multifilament consisting of a monofilament having a circular cross section having a cross section diameter of 13.78 / m, in the same manner as in Production Example 5, except that the monofilament of the lyocell monofilament is 2.0 denier. Was prepared. With respect to the lyocell fibers prepared in Preparation Examples 1 to 6, the cross-sectional shape, cross-sectional area, fineness and space occupancy of the lyocell monofilament contained in the lyocell fibers were measured and calculated by the following method, and the results were as follows. Table 1 shows. 2020/004843 1 »（： 1 ^ 1 {2019/007218

(1) Cross-sectional shape of monofilament contained in lyocell fibers

 A small amount of fiber was sampled, rolled together with black cotton, and inserted into a hole in a plate capable of cutting the cross section, and then cut so that the cross section was not pushed with a razor blade.

 The image was magnified and observed using an optical microscope (BX51, manufactured by Olympus, Inc.) (X500) and the image was stored with a digital camera. The cross-sectional image of the fiber was determined using the Olympus soft imaging solut ion program, and the length and area of the major and minor axes, the fiber thickness, and the circumferential length were analyzed.

(2) fine island

Using the monofilament cross-sectional area of the actual lyocell fibers obtained through the cross-sectional analysis and the density of the lyocell fibers (1.49 g / cm ² ), the fineness of the lyocell fibers was calculated by Equation 2 below.

 <Expression 2>

Fineness (De) = _ [monofilament cross-sectional area of lyocell fiber (， ² ) X density of lyocell fiber (g 八: m ³ ) X 9000 (m)] / 1000000 (3) space occupancy

 The space occupancy rate of the lyocell fibers was calculated by the following equation.

 <Equation 1 ñ

 Space occupancy (%) = (area of virtual first circle / cross-sectional area of monofilament contained in lyocell fibers) X 100

[Table 1]

2020/004843 1»(：1^1{2019/007218

2020/004843 1 »(： 1 ^ 1 {2019/007218

상기 표 1에 나타난 바와 같이， 3개의 돌기를 포함하는 이형 단면을 가지는 모노 필라멘트로 이루어진 제조예 1 내지 4의 라이오셀 섬유는, 원형 단면을 가지는 모노 필라멘트로 이루어진 제조예 5 및 제조예 6의 라이오셀 섬유에 비해, 공간 점유율이 큰 것으로 나타났다. 이때， 도 2의 （3） 내지 （ 는 제조예 1 내지 제조예 3의 라이오셀 섬유의 단면을 촬영한 사진이다.

As shown in Table 1, the lyocell fibers of Preparation Examples 1 to 4 consisting of a monofilament having a heteromorphic cross section including three protrusions, the lyocells of Preparation Example 5 and Preparation Example 6 consisting of a monofilament having a circular cross section Compared to the cell fibers, the space occupancy was shown to be large. At this time, (3)-() of FIG. 2 is the photograph which took the cross section of the lyocell fiber of manufacture example 1-manufacture example 3.

 From this, it was confirmed that the lyocell fibers of Preparation Examples 1 to 4 had a large specific surface area, and could be widely applied to a field requiring fibers having a large specific surface area.

<Example>

 Example 1

The lyocell fiber prepared in Preparation Example 1 was steam box (pressure conditions) 2020/004843 1 »（： 1 ^ 1 {2019/007218

0.21¾ "(L ²⁾ passes through the pre-heating state, while giving a temperature to the tow 2.01¾八to: by compression bonding using a stuffer box compress a pressure of ² ruler, stirrer to prepare a crimped tow from the stuffer box this [ The lyocell staple fiber having a 38ä fiber length was prepared by drying through a relative dryer and finally cutting.

 The prepared lyocell staple fiber was finally manufactured through the carding and spun lacing process, which is a nonwoven fiber aggregate manufacturing process, and the nonwoven fiber aggregate basis weight was adjusted to the numerical values shown in Table 2 by adjusting raw material input and processing speed. Nonwoven fiber aggregate basis weight deviation was within ± 10% range. Examples 2-4

 Except for changing the basis weight as shown in Table 2 by using each of the lyocell fibers prepared in Preparation Examples 2 to 4, a nonwoven fabric assembly was prepared in the same manner as in Example!

 The prepared nonwoven fiber aggregates were measured in the following physical properties and are shown in Table 2 below. Comparative Examples 1 and 2

 Table using the lyocell fibers prepared in Preparation Examples 5 and 6, respectively

A nonwoven fabric assembly was prepared in the same manner as in Example 1, except that the basis weight was changed as in Example 2.

 The prepared nonwoven fiber aggregates were measured in the following physical properties and are shown in Table 2 below.

<Measurement method ñ

 (1) Basis weight (Yo = g / v?)

The nonwoven fiber aggregates were 5011 horizontal and 20 vertical (sampled with plaque, weighed, and calculated by the following Equation 3 to obtain a basis weight. 2020/004843 1 »(： 1 ^ 1 {2019/007218

<Expression 3>

Basis weight ₌ nonwoven fiber aggregate sample weight measurement X 100

(2) thickness

 No. of Mitutoyo Measured using 2046F.

(3) transparency

 Sample preparation: The nonwoven fiber assembly is immersed in water or essence for 10 minutes.

 Haze, a light transmissive instrument, for measuring transparency of nonwoven fiber assemblies

Meter (Nippon Denshoku Industry, NDH-5000) was used and the transmittance of the wavelength of nm was measured.

(4) absorbency

 After immersing the nonwoven fiber assembly in water or essence for 10 minutes, the weight of the non-woven fiber assembly was immediately calculated after calculating the weight of the nonwoven fiber assembly by Equation 4 below.

 <Equation 4 ñ

 Absorbent (= {(Nonwoven Fiber Assembly Weight After Soaking-Weight of Nonwoven Fiber Assembly Before Soaking) / Nonwoven Fiber Assembly Weight Before Soaking} x 100

(5) skin adhesion

 The nonwoven fiber assembly is cut into 25 mm x 150 mm size and immersed in water or essence for 10 minutes and adhered to the human arm. Immediately after adhesion, Instrondnstron, Instron-3365) was used to measure the adhesive force (unit gf) while removing the nonwoven fiber aggregate from the skin.

2020/004843 1»（：1^1{2019/007218 Table 2

2020/004843 1 »（： 1 ^ 1 {2019/007218

상기 표 2에 나타난 바와 같이， 실시예 1 내지 4는 다수 개의 돌기를 포함하는 이형단면， 특히 다수 개의 돌기가 가상의 제 1원 및 상기 가상의 제 1원의 내부에 포함된 가상의 제 2원과 접하되, 상기 가상의 제 2원을 중심부로 하여 일체형으로 형성되며 그 말단이 상기 가상의 제 1원과 접하는 형상을 갖는 것을 특징으로 하는 부직 섬유 집합체에 의해, 비교예 1 및 2의 부직 섬유 집합체 보다 두께가 얇으면서 투명성， 흡수성, 밀착력이 우수한성능을 나타냄을 확인했다.

As shown in Table 2, Examples 1 to 4 are heterogeneous cross-sections including a plurality of protrusions, in particular, a virtual second circle in which a plurality of protrusions are included in the inside of the virtual first circle and the virtual first circle. Nonwoven fibers of Comparative Examples 1 and 2, wherein the nonwoven fibers of Comparative Examples 1 and 2 are in contact with each other, and are formed integrally with the imaginary second circle as a center and the ends thereof contact with the imaginary first circle. It was confirmed that the thinner than the aggregate shows excellent performance in transparency, water absorption, and adhesion.

As described above in detail specific parts of the present invention, for those of ordinary skill in the art these specific descriptions are only preferred embodiments, thereby limiting the scope of the present invention. 2020/004843 1 »（： 1 ^ 1 {2019/007218

It will be clear. Thus, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

 [Explanation of code]

 1: center part, 2: protrusion, 3: long axis of protrusion, 4: recess of protrusion, 5: end of protrusion

 11 ： Virtual 1st Circle, 12: Virtual 2nd Circle

Claims

2020/004843 1 »（： 1 ^ 1 {2019/007218 【claims】  [Claim 1]  Comprising lyocell fibers prepared by spinning lyocell spinning dope comprising cellulose pulp and aqueous methylmorpholine-oxide solution,  The cross section of the lyocell monofilament included in the lyocell fiber includes a plurality of protrusions,  The plurality of protrusions are in contact with a virtual first circle and a virtual second circle included in the virtual first circle, and are integrally formed with the virtual second circle as a center and the ends thereof are virtual. A nonwoven fiber assembly having a shape in contact with the first member of the. [Claim 2]  According to claim 1, The lyocell spinning dope is 6 to 16% by weight of cellulose pulp; And 84 to 94% by weight of an aqueous methyl morpholine-oxide solution. [Claim 3]  The nonwoven fiber assembly according to claim II, wherein the cellulose pulp has an alpha-cellulose content of 85 to 97% by weight and a polymerization degree (班 ½) of 600 to 1700. [Claim 4]  The nonwoven fiber assembly of claim 1, wherein the lyocell fibers have a space occupancy of 150 to 300%, as defined by Equation 1.  <Equation 1>  Space occupancy） = (area of virtual first circle / cross-sectional area of lyocell monofilament) X 100 [Claim 5] The method of claim 11, wherein the imaginary first circle has a radius of 6.0 to 7.8 / lose 2020/004843 1 »（： 1 ^ 1 {2019/007218 Nonwoven Fiber Aggregates. [Claim 6]  The nonwoven fiber assembly of claim 1, wherein the imaginary second member has a radius of 1.8 to 2.1. [Claim 7]  The nonwoven fiber assembly of claim 1, wherein the virtual first circle and the virtual second circle have the same center. [Claim 8]  The nonwoven fiber assembly of claim 1, wherein the fineness of the lyocell fibers is 1.0 to 1.5 denier. [Claim 9]  The nonwoven fiber assembly of claim 1, wherein the lyocell fibers have a fiber length of 36 to 40 microns. [Claim 10]  The nonwoven fiber assembly of claim 1, wherein the number of crimps of the lyocell fibers is 8 to 1. [Claim 11]  The nonwoven fiber assembly of claim 1, wherein the lyocell fibers have an emulsion content of 0.01 to 0.4 wt% based on 100 wt% of the lyocell fibers. [Claim 12] The nonwoven fiber assembly of claim 1, wherein the basis weight of the nonwoven fiber assembly is 30 to 60 _§ / 01 ² . 2020/004843 1 »（： 1 ^ 1 {2019/007218 [Claim 13]  The nonwoven fiber assembly of claim 1, wherein the nonwoven fiber assembly has a thickness of 0.3 to 0.6 ä. [Claim 14]  The nonwoven fiber assembly of claim 1, wherein the nonwoven fiber assembly has a water absorption of 1000 to 1600% of the lyocell fiber weight. [Claim 15]  The nonwoven fabric assembly of claim 1, wherein the nonwoven fabric assembly has a transparency of 80 to 84% after water treatment. [Claim 16]  The nonwoven fiber assembly of claim 1, wherein the nonwoven fiber assembly has a transparency of 88 to 94% after an essence treatment. [Claim 17]  The nonwoven fiber assembly of claim 1, wherein the nonwoven fiber assembly has a skin adhesion of 3.6 to 4.2 gf after water treatment. [Claim 18] The method of claim 1, wherein the nonwoven fiber assembly has a skin adhesion of 4.5 to 5.3 after the essence treatment

Fiber aggregate. [Claim 19] The nonwoven fiber assembly of claim 1, wherein the nonwoven fiber assembly has an emulsion content of 0.001% by weight or less relative to 100% by weight of the nonwoven fiber assembly. 2020/004843 1 »（： 1/10 公 019/007218 [Claim 20]  Mask pack sheet using the nonwoven fiber assembly according to claim 1.