KR102620716B1 - Nonwoven fabric with Lyocell fiber and its manufacturing method - Google Patents

Abstract

The present invention relates to a nonwoven fabric to which lyocell fibers are applied and a method for manufacturing the same. According to the present invention, a fiber cutting step of preparing lyocell fibers and cutting them into chop shapes; A fiber dispersion step of mixing and stirring water, the Lyocell fiber, and a resin selected from polyester, polyvinyl butyral, polyvinyl alcohol, and eco-friendly resin; It is possible to provide a method of manufacturing a nonwoven fabric to which Lyocell fibers are applied, including a molding step of molding the mixture in which the Lyocell fibers are dispersed through a wet method and a first drying step of drying the molded product.

Description

Nonwoven fabric with Lyocell fiber and its manufacturing method}

The present invention relates to a non-woven fabric to which Lyocell fibers are applied and a method of manufacturing the same. More specifically, the present invention relates to a non-woven fabric using a wet method using eco-friendly Lyocell pulp and Lyocell fibers manufactured through NMMO, thereby producing an environmentally friendly and disposable fabric. It relates to nonwoven fabrics applied with lyocell fibers that can be used in products and their manufacturing methods.

Recently, with the increase in convenience, the use of pad-type sanitary products such as disposable diapers, sanitary napkins, panty liners, and urinary incontinence pads has become common. The product can be largely divided into an upper sheet and an absorbent layer. The absorbent layer absorbs body secretions such as urine and menstrual fluid and gels them to prevent body secretions from leaking out of the pad. The top sheet is the part that comes into direct contact with the human body and plays a role in preventing the absorbent layer from coming into direct contact with the human body. do. In other words, the liquid permeability of the top sheet is a very important factor because body secretions must pass through the top sheet and reach the absorption layer.

Specifically, most upper sheets use non-woven fabric made from polymers of synthetic plastic materials such as polyethylene, polypropylene, and polyester. As a conventional technology, Korea Patent No. 10-0412284, ‘Method for manufacturing functionally enhanced non-woven fabric for diapers and sanitary pads’ has been disclosed.

Nonwoven fabrics made of synthetic plastic materials as described above have many advantages, such as having high physical strength, not being easily torn, not producing fluff, and providing a smooth texture. However, due to their hydrophobicity, they have the property of inhibiting the passage of body secretions.

To increase liquid permeability, you can consider using a hydrophilic nonwoven fabric such as rayon, which has high affinity for water, as the upper sheet. However, hydrophilic nonwoven fabric absorbs water and weakens its strength, so it can be easily torn physically and can be easily torn by friction. It has many disadvantages, such as producing fluff and causing skin irritation. In addition, hydrophilic nonwoven fabrics absorb body secretions and remain wet for a long time, which can cause many discomforts during use.

Meanwhile, disposable sanitary products have a short replacement cycle and generate too much waste, causing environmental pollution.

Therefore, there is a need to develop non-woven fabrics that have excellent absorbency, durability, and can reduce the amount of waste.

In order to solve the above problems, the present invention manufactures a non-woven fabric through a wet method using eco-friendly lyocell pulp and lyocell fiber manufactured through NMMO, thereby producing lyocell fiber that is environmentally friendly and can be used for disposable products. The purpose is to provide a nonwoven fabric to which applied and its manufacturing method.

In order to solve the above problems, the method of manufacturing a nonwoven fabric using lyocell fibers according to the first embodiment of the present invention includes a fiber cutting step of preparing lyocell fibers and cutting them into chop shapes; A fiber dispersion step of mixing and stirring water, the Lyocell fiber, and a resin selected from polyester, polyvinyl butyral, polyvinyl alcohol, and eco-friendly resin; It is possible to provide a method of manufacturing a nonwoven fabric to which Lyocell fibers are applied, including a molding step of molding the mixture in which the Lyocell fibers are dispersed through a wet method and a first drying step of drying the molded product.

In addition, the fiber cutting step is characterized by cutting the lyocell fibers to a size of 6 to 10 mm.

In addition, the fiber dispersion step is characterized by mixing 1 to 3 parts by weight of Lyocell fiber and 0.01 to 0.06 parts by weight of resin with 10,000 parts by weight of water.

Additionally, the first drying step is characterized in that the molded product is dried at 60 to 80°C for 15 to 60 minutes or at 100 to 150°C for 3 to 8 minutes.

In addition, the method of manufacturing a nonwoven fabric to which Lyocell fibers are applied according to the second embodiment of the present invention is a first reinforcing stirrer mixed with water, Tencel fibers, and resin on one side of the base layer formed by drying the molded product after the first drying step. A first reinforcement step of forming a first reinforcement layer by applying; A second drying step of drying the first reinforcement layer; A second reinforcing step of forming a second reinforcing layer by applying a second reinforcing stirrer mixed with water, kapok fiber, resin, calcium phosphate, hyaluronic acid, and a vinyl acetate-based copolymer having a linear structure to one side of the first reinforcing layer, and It may include a third drying step of drying the second reinforcement layer.

In addition, a nonwoven fabric applied with Lyocell fibers according to an embodiment of the present invention and Lyocell fibers containing polyester, PolyVinyl Butyral, PolyVinyl Alcohol, and a resin that is one of the eco-friendly resins. can be provided.

In addition, a base layer containing the Lyocell fiber and a resin selected from polyester, polyvinyl butyral, polyvinyl alcohol, and eco-friendly resin; It may include a first reinforcing layer containing water, Tencel fibers, and resin, and a second reinforcing layer containing water, kapok fibers, resin, calcium phosphate, hyaluronic acid, and a vinyl acetate-based copolymer having a linear structure.

The nonwoven fabric to which Lyocell fiber is applied according to the embodiment of the present invention as described above and its manufacturing method are environmentally friendly by manufacturing the nonwoven fabric through a wet method using eco-friendly Lyocell pulp and Lyocell fiber manufactured through NMMO. You can.

Accordingly, it can be used in a variety of fields, including disposable products such as masks, diapers, sanitary napkins, and disposable underwear.

Additionally, the manufacturing process is simple, so manufacturing time and cost can be reduced.

Additionally, harmful substances such as carbon disulfide and hydrogen sulfide generated during the manufacturing process can be reduced to almost zero, preventing air and water pollution.

Figure 1 is a flow chart schematically showing a method for manufacturing a nonwoven fabric to which lyocell fibers are applied according to a first embodiment of the present invention.
Figure 2 is a flow chart schematically showing a method for manufacturing a nonwoven fabric to which lyocell fibers are applied according to a second embodiment of the present invention.
Figure 3 is a cross-sectional view showing a nonwoven fabric to which lyocell fibers are applied according to an embodiment of the present invention.

Since the present invention can be subject to various changes and can have various forms, specific embodiments will be described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise” or “have” are intended to designate the existence of a combination of features, numbers, steps, components, etc. described in the specification, but are not limited to one or more other features or numbers, It should be understood that the existence or addition possibility of combinations of steps, components, etc. is not excluded in advance.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

Here, repeated descriptions, known functions that may unnecessarily obscure the gist of the present invention, and detailed descriptions of configurations are omitted. Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

Figure 1 is a flow chart schematically showing a method for manufacturing a nonwoven fabric to which lyocell fibers are applied according to the first embodiment of the present invention.

Referring to Figure 1, the method for manufacturing a nonwoven fabric using lyocell fibers according to the first embodiment of the present invention includes a fiber cutting step (S1), a fiber dispersion step (S2), a forming step (S3), and a first drying step (S4). ) may include.

The fiber cutting step (S1) is a step of preparing lyocell fibers and cutting them into chop shapes. Lyocell fibers can be cut into chops of 6 to 10 mm in size. This is because if the size of the Lyocell fiber chop is less than 6 mm, the contact area between fibers may be small when producing non-woven fabric, which may weaken the bonding force, and if it is more than 10 mm, the chop may become entangled with each other, making dispersion difficult.

Meanwhile, the lyocell fiber used in the present invention is a synthetic fiber derived from cellulose, a natural resource, and may be obtained through wet spinning from natural wood or pulp. In addition, the raw material is cellulose extracted from natural wood pulp, which is a 100% biodegradable polymer, and the solvent used is NMMO, which is renewable and can be used indefinitely, making it environmentally friendly.

More specifically, Lyocell fibers can be manufactured using cellulose pulp, N-methylmorphin-N-oxide (NMMO), and a solvent containing water. Cellulose pulp is manufactured into powder, and cellulose powder and solvent are used. It can be manufactured by mixing glycerol-structured additives to prepare a cellulose solution and then spinning the cellulose solution.

These lyocell fibers are biodegradable, have a soft touch, have excellent drape properties, elasticity, etc., and have excellent durability and excellent absorbency.

The fiber dispersion step (S2) is a step of preparing a mixture, and the mixture can be prepared by mixing and stirring water, Lyocell fiber, and resin.

Here, the resin may be one of polyester, polyvinyl butyral, polyvinyl alcohol, and eco-friendly resin. Polyester has excellent adhesion and is water-soluble, making it workable. It is most preferable because it is easy, but it is not limited to this.

In step S2, a mixture can be prepared by mixing 1 to 3 parts by weight of Lyocell fiber and 0.01 to 0.06 parts by weight of resin with 10,000 parts by weight of water.

Here, if the Lyocell fiber is less than 1 part by weight, the strength and durability may be reduced, and if it is more than 3 parts by weight, the dispersibility is reduced and the surface feel and absorbency are reduced due to entanglement and crowding between the chopped Lyocell fibers. It can be.

In addition, if the resin is less than 0.01 parts by weight, the bonding strength between fibers decreases, and if it exceeds 0.06 parts by weight, it becomes hard and softness decreases, and flexibility and touch may decrease. When applied to diapers, sanitary napkins, and disposable underwear, feel and absorbency are important factors.

Additionally, in step S2, when preparing the mixture, one or more of oxygenamide and carbicine may be further mixed.

Oxymidamide and carbicine can exhibit antibacterial functions, and each exhibit desirable antibacterial functions, and may be mixed in an amount of 0.008 to 0.02 parts by weight so as not to deteriorate physical properties.

Meanwhile, step S2 may disperse the lyocell fibers using a compressor, but is not limited to this.

The molding step (S3) is a step of molding a mixture in which Lyocell fibers are dispersed through a wet method, and a molded product can be manufactured by molding the mixture into a non-woven fabric (web). At this point, the water can drain.

The first drying step (S4) is a step of applying heat to dry the moisture in the molded product. The molded product is placed in an oven at 60 to 80°C for 15 to 60 minutes or through a hot press at 100 to 150°C for 3 to 8 minutes. A nonwoven fabric (base layer) can be obtained by drying, but is not limited to this.

At this time, if the drying temperature is less than 60 or 100℃, moisture may not evaporate sufficiently, and if it exceeds 80 or 150℃, burning problems may occur.

In addition, if the drying time is less than 15 or 3 minutes, the temperature must be raised rapidly to dry, so the outside is dried but the inside is not, which may deteriorate the physical properties. If the drying time is more than 60 or 8 minutes, uniform drying may not occur. There may be.

Figure 2 is a flow chart schematically showing a method of manufacturing a nonwoven fabric to which Lyocell fibers are applied according to a second embodiment of the present invention, and Figure 3 is a cross-sectional view showing a nonwoven fabric to which Lyocell fibers are applied according to an embodiment of the present invention.

Referring to Figure 2, the nonwoven fabric manufacturing method to which lyocell fibers are applied according to the second embodiment of the present invention includes, after step S4, a first reinforcing step (S5), a second drying step (S6), and a second reinforcing step (S7). ) and a third drying step (S8) may be further included.

Here, according to the second embodiment of the present invention, except that it further includes a first reinforcement step (S5), a second drying step (S6), a second reinforcement step (S7), and a third drying step (S8). The method of manufacturing a nonwoven fabric using Lyocell fibers can be said to be substantially the same as the first embodiment of the present invention described above.

Therefore, only the first reinforcement step (S5), the second drying step (S6), the second reinforcement step (S7), and the third drying step (S8) will be described in detail.

In the first reinforcing step (S5), the first reinforcing stirrer may be applied to one surface of the base layer 110 formed by drying the molded product in step S4 to form the first reinforcing layer 120.

Here, the first reinforcing layer 120 is intended to further increase the absorbency of the non-woven fabric, and when applied to diapers, sanitary napkins, disposable underwear, etc., it can be formed on the inner surface of the base layer 110 to increase internal absorbency.

The first reinforcing stirrer forming the first reinforcing layer 120 may be manufactured by mixing water, Tencel fiber, and resin.

Tencel fiber is an eco-friendly material made from eucalyptus tree extract, has excellent moisture content and absorbency, is effective for sensitive skin because the fiber structure is smooth and does not irritate the skin, and has biodegradable properties.

These tencel fibers can be used in the form of chops with a size of 6 to 10 mm in the first reinforcing stirrer, but are not limited thereto.

Additionally, the first reinforced stirred product can be prepared by mixing 4 to 5 parts by weight of Tencel fiber and 0.03 to 0.08 parts by weight of resin with 10,000 parts by weight of water.

Here, if the Tencel fiber is less than 4 parts by weight, the effect of improving absorbency may be minimal, and if it exceeds 5 parts by weight, the fiber may be too dense, which may reduce the effect of improving absorbency, the bonding strength may be reduced, and the first reinforcing layer (120 ) Problems may arise in formation.

In addition, if the resin is less than 0.03 parts by weight, there may be difficulty in forming the first reinforcement layer 120, and if it is more than 0.08 parts by weight, absorbency, flexibility, etc. may be reduced.

The resin used here may be one of polyester, polyvinyl butyral, polyvinyl alcohol, and eco-friendly resin, but is not limited thereto.

The second drying step (S6) is a step of drying the base layer 110 on which the first reinforcing layer 120 is formed, and moisture can be removed by drying the nonwoven fabric (first reinforcing layer, base layer).

At this time, drying may be performed at 110 to 130°C for 20 to 40 minutes, but is not limited thereto.

In the second reinforcing step (S7), the second reinforcing layer 130 may be formed by applying a second reinforcing stirrer to one surface of the first reinforcing layer 120 formed in step S6.

Here, the second reinforcing layer 130 is intended to increase the durability and strength of the non-woven fabric, and when applied to diapers, sanitary napkins, disposable underwear, etc., it can minimize shape deformation and ensure excellent strength.

The second reinforcing stirrer forming the second reinforcing layer 130 may be prepared by mixing water, kapok fibers, resin, calcium phosphate, hyaluronic acid, and a vinyl acetate-based copolymer with a linear structure.

Kapok fiber is a seed fiber obtained from the fruit of the kapok tree. It contains a large amount of air within the fiber, so it is light and insulating. It has a silk-like luster, has 2 to 3 hairs, is fluffy and soft, and is resistant to moisture but elastic. It has excellent dimensional stability and biodegradability.

These kapok fibers can be mixed in an amount of 7 to 10 parts by weight per 10,000 parts by weight of water. If the amount is less than 7 parts by weight, the effect of improving shape stability and strength may be minimal, and if it exceeds 10 parts by weight, flexibility may be reduced. .

The resin may be one of polyester, polyvinyl butyral, polyvinyl alcohol, and eco-friendly resin, but is not limited thereto, and is used in an amount of 0.05 to 0.1 weight per 10,000 parts by weight of water. Can be mixed into parts.

At this time, if the resin is less than 0.05 parts by weight, the bonding strength is reduced, and if it is more than 0.1 parts by weight, it becomes hard and flexibility may be reduced.

Calcium phosphate can improve the strength and texture of the second reinforcement layer 130, and can be mixed in an amount of 0.004 to 0.01 parts by weight based on 10,000 parts by weight of water.

If calcium phosphate is less than 0.004 parts by weight, the effect of improving strength and structure is minimal, and if it is more than 0.01 parts by weight, it may affect flexibility. The second reinforcement layer 130 preferably has excellent shape stability and flexibility.

Hyaluronic acid improves adhesion, increases bonding between fibers, and can improve flexibility by complementing the stiff characteristics of kapok fibers. It can be mixed at 0.003 to 0.009 parts by weight per 10,000 parts by weight of water.

At this time, if the hyaluronic acid is less than 0.003 parts by weight, the effect of improving adhesion may be reduced, and if it is more than 0.009 parts by weight, the physical properties, etc. may be reduced.

Vinyl acetate-based copolymers with a linear structure are made to have excellent flexibility by controlling the viscosity, and are composed of the monomer vinyl acetate, vinyl versatate, and isobutyl acrylate (iso- butyl acrylate, n-Butyl acrylate, Ethyl acrylate, 2-Ethylhexyl acrylate, Lauryl acrylate, Ethylene It may be a vinyl acetate-based copolymer synthesized to have a linear polymer structure by polymerizing comonomers such as the like.

Additionally, the vinyl acetate-based copolymer having a linear structure may have a glass transition temperature (Tg) of -5 to 15°C.

Here, if the glass transition temperature (Tg) of the vinyl acetate-based copolymer having a linear structure is less than -5°C, the viscosity may increase too much, which may cause problems with curing and physical properties of the second reinforcing layer 130, and if it exceeds 15°C. If so, it may not be suitable for the flexibility improvement effect.

Additionally, the vinyl acetate-based copolymer having a linear structure may be mixed in an amount of 0.015 to 0.018 parts by weight based on 10,000 parts by weight of water. This is because if the vinyl acetate-based copolymer is less than 0.015 parts by weight, the effect of improving flexibility is minimal, and if it exceeds 0.018 parts by weight, the viscosity may increase too much.

The third drying step (S8) is a step of drying the second reinforcing layer 130, and moisture can be removed by drying the nonwoven fabric (second reinforcing layer, first reinforcing layer, base layer).

At this time, drying may be performed at 110 to 130°C for 20 to 40 minutes, but is not limited thereto.

Through this, as shown in FIG. 3, a nonwoven fabric 1 to which lyocell fibers are applied, consisting of a base layer 110, a first reinforcement layer 120, and a second reinforcement layer 130, can be manufactured.

A nonwoven fabric manufactured by the above manufacturing method can be provided.

The nonwoven fabric (1) to which Lyocell fibers according to an embodiment of the present invention is made of Lyocell fibers and a resin that is one of polyester, polyvinyl butyral, polyvinyl alcohol, and eco-friendly resin. may include.

When including the first reinforcement layer 120 and the second reinforcement layer 130, the above components may be included in the base layer 110.

As described above, the nonwoven fabric to which Lyocell fibers are applied according to an embodiment of the present invention and its manufacturing method utilize eco-friendly Lyocell pulp and Lyocell fibers manufactured through NMMO to produce a nonwoven fabric through a wet method, It can be environmentally friendly.

Accordingly, it can be used in a variety of fields, including disposable products such as masks, diapers, sanitary napkins, and disposable underwear.

Additionally, the manufacturing process is simple, so manufacturing time and cost can be reduced.

Additionally, harmful substances such as carbon disulfide and hydrogen sulfide generated during the manufacturing process can be reduced to almost zero, preventing air and water pollution.

Hereinafter, the present invention will be described in more detail through examples.

However, the following examples only illustrate the present invention, and the content of the present invention is not limited by the following examples.

In addition, the embodiments of the present invention described below can be implemented with various substitutions, modifications, and changes without departing from the technical spirit of the present invention, and these implementations are within the scope of the technical field to which the present invention belongs from the description of the embodiments described above. Any expert can easily implement it.

[Example]

[Example 1]

A nonwoven fabric was manufactured by molding and drying a mixture of 10,000 parts by weight of water, 3 parts by weight of Lyocell fiber, and 0.02 parts by weight of resin.

[Example 2]

A nonwoven fabric was manufactured by composing Example 1 as a base layer, forming a first reinforcing layer with the first reinforcing agitator and a second reinforcing layer with the second reinforcing agitator.

Here, the first reinforced stirred product was prepared by mixing 5 parts by weight of Tencel fiber and 0.04 parts by weight of resin with 10,000 parts by weight of water, and the second reinforced stirred product was prepared by mixing 10,000 parts by weight of water with 8 parts by weight of kapok fiber, 0.06 part by weight of resin, It is manufactured by mixing 0.008 parts by weight of calcium phosphate, 0.006 parts by weight of hyaluronic acid, and 0.016 parts by weight of a vinyl acetate-based copolymer with a linear structure.

[Experimental example] Performance evaluation

By manufacturing diapers using Examples 1 and 2, Preparation Examples 1 and 2 were formed, and the performance of Preparation Examples 1 and 2 was evaluated. At this time, the experiment was conducted using water with added pigment.

The results are shown in Table 1 below.

Manufacturing Example 1 Production example 2 Absorption amount (g) 12 12 Initial absorption time (sec) 0.2 0.1 Final absorption time (sec) 3.4 3.0 It comes out middle less

As can be seen from Table 1, both Preparation Example 1 and Preparation Example 2 absorbed water quickly, but Preparation Example 2 was confirmed to be superior to Preparation Example 1 in terms of absorption.

Above, specific parts of the content of the present invention have been described in detail, and for those skilled in the art, it is clear that these specific techniques are merely preferred embodiments and do not limit the scope of the present invention. It will be obvious. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

100: Non-woven fabric with lyocell fiber applied
110: base layer
120: first reinforcement layer
130: second reinforcement layer

Claims (7)

A fiber cutting step of preparing lyocell fibers and cutting them into chop shapes;
A fiber dispersion step of mixing and stirring water, the Lyocell fiber, and a resin selected from polyester, polyvinyl butyral, polyvinyl alcohol, and eco-friendly resin;
A molding step of molding the mixture in which the Lyocell fibers are dispersed through a wet method;
A first drying step of drying the molded product;
A first reinforcing step of forming a first reinforcing layer by applying a first reinforcing stirrer mixed with water, Tencel fiber, and resin to one side of the base layer formed by drying the molded product;
A second drying step of drying the first reinforcement layer;
A second reinforcing step of forming a second reinforcing layer by applying a second reinforcing stirrer mixed with water, kapok fiber, resin, calcium phosphate, hyaluronic acid, and a vinyl acetate-based copolymer having a linear structure to one side of the first reinforcing layer, and
A method of manufacturing a nonwoven fabric to which lyocell fibers are applied, comprising a third drying step of drying the second reinforcing layer.
According to paragraph 1,
The fiber cutting step is,
A method of manufacturing a nonwoven fabric to which Lyocell fibers are applied, characterized in that the Lyocell fibers are cut to a size of 6 to 10 mm.
According to paragraph 1,
The fiber dispersion step is,
A method of manufacturing a nonwoven fabric to which lyocell fibers are applied, characterized in that 1 to 3 parts by weight of lyocell fiber and 0.01 to 0.06 parts by weight of resin are mixed with 10,000 parts by weight of water.
According to paragraph 1,
The first drying step is,
A method of manufacturing a nonwoven fabric to which lyocell fibers are applied, characterized in that the molded product is dried at 60 to 80°C for 15 to 60 minutes or at 100 to 150°C for 3 to 8 minutes.
delete A base layer containing Lyocell fiber and a resin that is one of polyester, polyvinyl butyral, polyvinyl alcohol, and eco-friendly resin;
A first reinforcement layer comprising water, Tencel fiber, and resin, and
A nonwoven fabric to which lyocell fibers are applied, including a second reinforcing layer containing water, kapok fibers, resin, calcium phosphate, hyaluronic acid, and a vinyl acetate-based copolymer with a linear structure. delete