KR101607939B1 - Absorbent core containing carboxymethyl cellulose fabrics and absorbent articles using the same - Google Patents

Abstract

The present invention relates to an absorbent core consisting of carboxymethylcellulose (CMC) fiber or fiber cloth and an absorbent article using the same.
The present invention provides an absorbent core composed of a CMC fiber or fiber cloth having a degree of substitution of 0.3 or more, or an absorbent core in which a CMC fiber or a fiber cloth is mixed with or mixed with a natural material such as wood pulp, And a back sheet layer made of polylactic acid or a cotton material on the back surface of the absorbent core, wherein the top sheet layer is made of rayon or cotton material on one side of the absorbent core, Are useful for feminine hygiene products, infant diapers, and adult urinary incontinence products by meeting the absorption and absorption rates required for product authorization.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent core composed of a carboxymethylcellulose fiber or a fiber cloth and an absorbent product using the same.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent core comprising a carboxymethylcellulose fiber or fiber cloth and an absorbent product using the same, and more particularly, to an absorbent core comprising a carboxymethyl cellulose (hereinafter referred to as "CMC & An absorbent core comprising a top sheet layer made of rayon or cotton material on one side of said absorbent core and a top sheet layer made of polylactic acid or cotton on the back side of said absorbent core, The present invention provides a biodegradable absorbent article comprising a back sheet layer made of a material which is capable of ensuring stability and natural decomposition of the skin due to the use of an environmentally and human-friendly cellulosic material, Absorbent core and an absorbent article using the same .

Disposable absorbent articles such as sanitary napkins or infant diapers or adult urinary incontinence products or panty liner articles may include a user facing surface provided by the top sheet, a garment facing surface provided by the back sheet, And an absorbent core between the backsheets.

The topsheet should be liquid permeable to absorb liquid into the absorbent core and the backsheet is designed to inhibit the liquid absorbed from the jam-facing side of the absorbent article from escaping and may be entirely liquid and gas impermeable, And is provided in such a manner that at least gas ventilation is provided and liquid leakage is suppressed.

The absorbent core of the absorbent article is provided in a thin and typically flat form at the beginning of the product, by use of an expandable material, but in use expands by providing a volume in which the absorbed liquid can store.

Such expanding materials include so-called absorbent gel materials, superabsorbents or compressed materials that are released from the compressed state when wetted. Compressed fiber structures or sponge structures, particularly regenerated cellulose sponge materials, are described in WO 1998-013003, WO 1997-40800 and WO 1997-40803.

The absorbent gelling material is typically provided in a distributed, particulate form so that the absorbent core is typically distributed substantially wider than the area where liquid absorption occurs. In addition, particulate absorbent gel material is generally provided with cellulose fibers or tissues to ensure good liquid transport to the particles and to provide additional absorbent capacity.

In order to utilize the entire absorbent structure, it is conventional in the art to include an absorbent core member for distributing the absorbed liquid. Particularly, in case of sanitary napkins, authorization can be obtained when the absorption magnification is 10 times, the artificial blood absorption rate is 60 seconds, and the re-wet is less than 2 g according to the Pharmaceutical Affairs Law.

Generally, in the conventional sanitary napkin, a superabsorbent polymer (SAP) particles are mixed with wood pulp to produce an absorbent layer. However, since the polymer absorbent is capable of absorbing moisture as a liquid or a glandular secretion becomes gelled, In recent years, there has been a problem in that it is disadvantageous to the market preference in accordance with the demand of environment-friendly materials in the related market, It is pointed out.

Therefore, in the related field of disposable absorbent products, studies have been actively carried out to replace cellulosic materials with polymeric materials used for various functional polymer materials and industrial fields in accordance with needs for environmentally friendly and human-friendly materials.

In particular, among natural fibers, cellulose is the most abundant biomass on the planet. It is an indefinite resource that repeats the cycle of generation, decomposition, utilization and production by natural laws, and can be provided as a functional, low-cost recycled material for mankind for thousands of years. have.

Particularly, oxidized cellulose obtained by oxidation treatment of such cellulose is used for medical applications such as wound dressings, hygiene products such as sanitary napkins, diapers, and the like due to the property of absorbing moisture while being gelled by moisture or body fluids, And has attracted attention as a material for beauty and the like.

As the oxidation-treated cellulose, carboxymethylcellulose is a cellulose derivative which has been proved as safety and efficacy, is easily permissible, can be decomposed spontaneously, and can replace a conventional absorbent chemical as a raw material harmless to human body.

However, CMC shapes conventionally used in the field of disposable absorbent products are mostly in the form of powder or particles. In this case, since the absorption ratio is low, it is not preferable for the application of the final absorbent product. Of carboxymethylcellulose having a fiber shape is required.

At present, the production method of CMC in the form of fiber or fibrillar is being produced on a laboratory scale, and the demand for mass production of CMC fiber or fibrillation is expected to increase day by day due to an increase in demand due to future use expansion.

Traditionally, CMC fleece has been manufactured in a 100% batch mode. However, in the case of the conventional batch method, the bath ratio of cellulose and the reaction liquid is large, resulting in the loss of the reaction liquid, and the production amount is limited depending on the reaction tank size and reaction time.

As another conventional alkali treatment method, there is a continuous alkali treatment method using a continuous decrementor, but there is a problem that a high temperature and a high concentration of alkali condition are required in the process.

The cold pad positioning method is applied to the cold pad positioning method. The cold pad positioning method is a method of dipping the fiber material into a chemical agent and then batching it for a predetermined time after continuous (pass) The method of the present invention is a method for causing a reaction at a low temperature while reducing the amount of a solvent used compared to a batch method and requiring no heating energy for inducing a reaction, And the continuous process of dyeing.

For example, Korean Patent Laid-Open Publication No. 2003-48259 discloses a method of producing cellulose fibers by cold pad laying, which contains at least a cellulose diacetate having a degree of substitution of 2.0 to 2.75 (super oxidation degree: 45 to 59.5%) .

Korean Patent No. 1242010 discloses superabsorbent surface-treated carboxyalkylated polysaccharide particles having a degree of substitution in the range of 0.2 to 1.0.

In the above, the CMC degree of substitution is obtained by replacing the hydroxyl group (-OH) of cellulose with a hydrophilic sodium carboxylmethyl group (-CH ₂ COONa) to show water solubility, and exhibits hygroscopicity similar to that of a general water-soluble polymer. Therefore, the degree of substitution in CMC obtained from cellulose starts to show water solubility when the degree of substitution is 0.3 or more, which is an important index for determining the properties of CMC together with the degree of polymerization.

As a result, the inventors of the present invention have attempted to improve the disadvantages of the conventional disposable absorbent products. As a result, CMC is used as an environmentally and human-friendly material, and in particular, An absorbent core composed of a CMC fiber or a fiber cloth having a carboxymethylation degree of substitution of 0.3 or more, or a CMC fiber or fiber cloth described above, an absorbent core in which natural materials are mixed or impregnated, and an absorbent product using the absorbent core, , Thereby completing the present invention.

It is an object of the present invention to provide an absorbent core comprised of a CMC fiber or fiber cloth having a degree of substitution of 0.3 or more.

Another object of the present invention is to provide an absorbent core made of a material in which a natural material is mixed or packed with the CMC fiber or fibrillated fiber.

It is a further object of the present invention to provide a disposable absorbent article using the absorbent core.

In order to achieve the above object, the present invention provides an absorbent core made of a CMC fiber or fiber cloth having a degree of substitution of 0.3 or more.

Further, the present invention provides an absorbent core in which 50 to 800 parts by weight of natural material of wood pulp, cotton fiber or a mixed form thereof is mixed with 100 parts by weight of CMC fiber or fiber cloth having a degree of substitution of 0.3 or more.

More preferably, the substitution degree of the CMC fiber or the fibril is 0.3 to 1.0, and the fiber length of the CMC fiber or fibril is 0.5 to 40 mm.

The present invention relates to an absorbent core (10) as described above; An upper sheet layer 20 made of rayon or cotton material on one side of the absorbent core; And a back sheet layer (30) made of polylactic acid or cotton on the back surface of the absorbent core.

The biodegradable absorbent article is useful for any one selected from the group consisting of feminine hygiene products, infant diapers, and urinary incontinence products, and the absorbent product using the absorbent core has 1) a minimum absorption rate of 12 times or more and 2) And an absorption rate of 15 seconds or less is satisfied.

The present invention provides an absorbent core composed of a CMC fiber or a fiber cloth having a carboxymethyl substitution degree of 0.3 or more, or an absorbent core composed of a material in which a natural material is mixed or packed with the above CMC fiber or fiber cloth, It can optimize the absorbing performance of the core, and it is possible to ensure stability and natural decomposition of skin due to use of environment and human-friendly cellulosic material.

A biodegradable absorbent article comprising a top sheet layer made of rayon or cotton material and a back sheet layer made of polylactic acid or cotton on the back surface of the absorbent core is provided on one surface of the absorbent core, It is useful not only for feminine hygiene products, infant diapers, and products for adult urinary incontinence, but also for daily necessities such as mask packs, products for relieving atopic disorders, and the like. In addition, the absorbent product of the present invention can be provided with market competitiveness because of the above-mentioned CMC fiber or fibrillated material's low cost effect due to its functionalities and abundant resource utilization.

1 is a photograph of an absorbent core made of CMC fiber of Example 1 of the present invention
Fig. 2 is a photograph of the state where the absorbent core of Fig. 1 is gelled when absorbed into water,
3 is a photograph of an absorbent core made of the CMC fiber cloth of Example 2 of the present invention,
Figure 4 is a photograph of the gelled state when the absorbent core of Figure 3 is absorbed into water
5 is a front view of the absorbent core in which the CMC fiber of the present invention and the nonwoven fabric of the cotton material are laminated
Fig. 6 is a photograph of the state where the inserted CMC fiber is gelled when the absorbent core of Fig. 5 is absorbed into water,
7 is a front view of the absorbent core in which the CMC fleece fabric of the present invention and the nonwoven fabric of the cotton material are packed
Fig. 8 is a photograph of a state in which the inserted CMC fleece cloth is gelled when the absorbent core of Fig. 7 is absorbed into water,
Fig. 9 is a schematic view of the construction of a feminine hygiene article as an example of an absorbent article using the absorbent core of the present invention.

Hereinafter, the present invention will be described in detail.

The present invention provides an absorbent core comprised of a CMC fiber or fiber cloth having a degree of substitution of 0.3 or more.

Fig. 1 shows an absorbent core consisting of a CMC fiber of the present invention. Fig. 3 is an absorbent core made of the inventive CMC fiber cloth, which is provided in the form of fibers and fibrils, not conventional CMC powders or particulate forms. Figs. 2 and 4 are photographs of a state in which the absorbent core composed of the CMC fiber and the absorbent core made of the CMC fiber cloth are respectively absorbed into water, and the absorbent core is provided as a fiber cloth or a nonwoven fabric- Or particle shape, it absorbs moisture and secretions to collect more, absorbing area is wider and absorbing performance is improved, and the environment and human-friendly cellulosic material are used to ensure stability to skin and natural decomposition is possible .

The present invention also provides an absorbent core comprising a mixture of 50 to 800 parts by weight of wood pulp, cotton fibers or natural materials in the form of a mixture of 100 parts by weight of CMC fiber having a degree of substitution of 0.3 or more and 100 parts by weight of a fibrillated fiber. At this time, if the content of the natural material is less than 50 parts by weight, the manufacturing cost rises and the production cost increases. If the natural material content exceeds 800 parts by weight, the re-wettability is poor and it is not preferable as an absorbent product.

That is, the absorbent core of the present invention can be obtained by mixing or blending the above-mentioned CMC fibers or fibrils with natural materials mixed with 50 to 800 parts by weight of natural materials such as wood pulp, cotton fibers or a mixture thereof, Lowering the problem of cost increase and providing price competitiveness in the product market.

FIG. 5 is a photograph of a front view of an absorbent core in which a CMC fiber of the present invention and a nonwoven fabric of a cotton material are laminated, and FIG. 6 is a photograph of a gelled state of the inserted CMC fiber when the absorbent core is absorbed in water.

7 is a frontal view of the absorbent core in which the CMC fleece fabric of the present invention and the cotton nonwoven fabric of the present invention are packed and Fig. 8 is a cross-sectional photograph of the inserted CMC fleece cloth when the absorbent core is absorbed in water. .

The substitution degree refers to the degree of substitution of carboxymethylation for which water-soluble addition is made by replacing hydroxy (-OH) of cellulose with a sodium carboxylmethyl group (-CH ₂ COONa) which is hydrophilic. CMC fiber cloth, more preferably 0.3 to 1.0 substituent. At this time, if the degree of substitution is less than 0.3, the re-wetting of the CMC fiber or the fibrillar fiber is insufficient, and if the degree of substitution is more than 1.0, the substituent is excessively large, resulting in blocking and deteriorating the absorption performance.

The CMC fibers or fibrils having a degree of substitution of 0.3 or more used in the absorbent core of the present invention are provided by a specific process that facilitates the degree of substitution. Specifically, the CMC fibers or the fibrils of the carboxymethylated substituent (DS) 0.3 or more CMC fibers or fibrils.

Specifically, in the case of the CMC fiber, the cellulose fiber is immersed in an alkaline solution by a cold pad arrangement method, placed in a specially-fabricated bobbin and placed in a reactor, and then reacted with a carboxymethylating solvent by a batch method to prepare a carboxymethylated solvent To produce CMC capable of mass production in the form of a fiber.

The CMC fleece fabric is obtained by dipping a cellulose woven fabric or a nonwoven fabric into an alkali solution by a cold pad arrangement method at a low temperature and wrapping it in a perforated roll and putting it in a reactor and then reacting with a carboxymethylating solvent by a batch method, .

At this time, in the alkali pad immersion process according to the cold pad disposition method, padding is performed with 20 to 40% NaOH to perform a pickup rate of 150 to 350%. In the alkali immersion process, the concentration of alkali solution (NaOH) is 20 to 40% If it is less than 20%, the required degree of CMC substitution can not be obtained. If it exceeds 40%, side reaction between acid (MCA) and alkali (NaOH) occurs frequently and CMC substitution degree is too high.

In addition, since the padding rate is 150 to 350%, the loss of the drug can be minimized because only the amount of cellulose can be retained. However, if the padding ratio is less than 150%, the amount of alkali (NaOH) to be reacted is small, while if it exceeds 350%, side reactions of acid (MCA) and alkali (NaOH) are often undesirable.

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Thereafter, in a step of reacting with a carboxymethylating solvent by a batch method to obtain a CMC fibrillated fiber, a cellulose woven or nonwoven fabric wound around a perforated roll is wound around a bobbin, the plurality of bobbins are put into a carrier and mounted in a reactor, (In → Out, Out → In) while allowing the liquid to pass.

At this time, the solvent of the reaction solution is _one in which C ₁ -C ₄ alcohol alone or monochloroacetic acid is added to the solvent. In this case, the use of an alcohol solvent is to use alcohol as a solvent since gelation occurs when CMC fiber or fibril is brought into contact with water.

The above CMC fiber or fibrillated fiber pads are disposed by the cold pad disposition method, so that the conventional method disposes the problem that the bath ratio of the cellulose and the reaction liquid becomes large due to the loss of the reaction liquid due to the large cell size and the production amount is limited depending on the reaction tank size and reaction time can do. That is, since only the amount of cellulose that can be retained by the cold pad arrangement method is used, drug loss can be minimized and a continuous process can be performed by using cellulose in the form of fiber such as fiber, woven fabric and nonwoven fabric.

In addition, the CMC fiber having a substituent of 0.3 or more, which can be mass-produced in a roll-to-roll state while shortening the aging time, can be provided by performing the batch method after the above cold pad disposition method.

From the above-described mass production method of the CMC fibrillated fiber, a CMC fibrillated fiber having a fiber length of 0.5 to 40 mm can be provided. At this time, if the fiber length is less than 0.1 mm, the binding force between the fibers deteriorates and the morphological stability of the nonwoven fabric deteriorates.

Furthermore, the present invention provides an absorbent core comprising a CMC fiber or fiber cloth having a degree of substitution of 0.3 or more; Or an absorbent core in which a natural material mixed with 50 to 800 parts by weight of natural material of wood pulp, cotton fiber or a mixture thereof is mixed or packed with the above CMC fiber or fibrillated fiber.

As a result of measurement of the physical properties of the absorbent product containing the CMC fiber having a degree of substitution of 0.65 prepared in the example of the present invention as an absorbent core, the average absorption rate was measured to be 8.1 seconds or less in three measurements, , Absorb water 17 times.

In addition, in the case of an absorbent product comprising an absorbent core composed of a CMC fiber cloth having a degree of substitution of 0.60, it absorbs within 12.60 seconds in three measurements, and the absorption capacity absorbs 12.30 times water as compared with the inherent weight of the absorbent core.

Furthermore, the physical properties of the absorbent product used as the absorbent core composed of the mixture of the absorbent core made of the material having the degree of substitution of 0.60 and the nonwoven fabric made of the cotton material and 3 g of the wood pulp, 9.93 seconds, and the absorption magnification shows the result of absorbing water 19 times as much as the absorption weight of the absorbent core.

From the above, the biodegradable absorbent article of the present invention satisfies 1) an absorption capacity of 12 times or more and 2) an absorption rate of 15 seconds or less.

9 is a schematic view of the configuration of a feminine hygiene article as an example of an absorbent article using the absorbent core of the present invention.

More specifically, the biodegradable absorbent article of the present invention comprises an absorbent core 10 made of a material mixed with a natural material, or an absorbent core composed of a CMC fiber or a fiber cloth having a substituent value of 0.3 or more, or the CMC fiber or fiber cloth described above;

An upper sheet layer 20 made of rayon or cotton material on one side of the absorbent core; And

And a back sheet layer 30 made of polylactic acid or cotton material on the back surface of the absorbent core.

The absorbent product of the present invention is composed of a natural and naturally decomposable ingredient in the upper sheet layer and the defecation sheet layer, as well as the environmentally and human-friendly cellulose material and the absorbency core of which degree of substitution is controlled. In particular, the absorbent product of the present invention can fundamentally solve the problem caused by the polymer absorber by using the absorbent core of the present invention in place of the polymeric absorbent superabsorbent polymer used in the absorbent layer of the conventional sanitary napkin.

The biodegradable absorbent article can be applied to sanitary articles for women such as sanitary napkins, panty liners, tampons, diapers for infants, and urinary incontinence products for adults, and other than the above-mentioned products as long as the same purpose is required.

Hereinafter, the present invention will be described in more detail with reference to Examples.

The present invention is intended to more specifically illustrate the present invention, and the scope of the present invention is not limited to these embodiments.

≪ Example 1 > Manufacture of absorbent core 1

1 kg of cellulose fiber was padded with 25% NaOH aqueous solution at a picking rate of 250%, and then charged into the bobbins. The MCA in 730 g was dissolved in isopropyl alcohol in the reactor where the solvent movement proceeds from In to Out and Out to In. , Followed by reaction at 60 ° C for 30 minutes, followed by washing with water. Thus, CMC fiber of carboxymethylated substituent (DS) 0.65 was obtained by continuous execution of the CPB method and the batch method. At this time, the fiber length of the CMC fiber was 1.0 to 2.7 mm.

≪ Example 2 > Manufacture of absorbent core 2

1 kg of the cellulose nonwoven fabric was padded with a pick-up rate of 250% in a 25% NaOH aqueous solution and wound on a perforated roll. 730 g of MCA was dissolved in isopropyl alcohol and reacted at 60 캜 for 30 minutes, and then washed by padded nonwoven fabric wound on a perforated roll in a reactor where the solvent movement progressed from In → Out and Out → In. Thus, CMC fibrils of carboxymethylated substituent (DS) 0.60 were obtained by continuous execution of CPB method and batch method. At this time, the fiber length was 1.0 to 2.7 mm.

≪ Example 3 > Manufacture of absorbent core 3

2 g of a CMC fiber having a carboxymethylated substituent (DS) of 0.65 prepared in Example 1 was added between nonwoven webs of 60 g / m 2 and a basis weight of 130 g / m 2 to prepare a laminate. The procedure of Example 1 was repeated, An absorbent core comprising a CMC fiber and a nonwoven fabric of a cotton material was prepared.

Example 4 Absorbent core manufacture 4

3 g of the carboxymethylated substituent (DS) 0.60 prepared in Example 2 and 30 g / m < 2 > of a nonwoven fabric web having a basis weight of 130 g / m < 2 > An absorbent core comprising CMC fiber cloth and cotton nonwoven fabric was fabricated.

≪ Example 5 > Manufacture of absorbent core 5

An absorbent core composed of a material in which 3 g of wood pulp was mixed with 2 g of CMC fiber having a carboxymethylated substituent (DS) 0.65 prepared in Example 1 was prepared.

Example 6 Production of absorbent article 1

2 g of CMC fiber of carboxymethylated substituent (DS) 0.65 prepared in Example 1 above was mixed with 3 g of wood pulp used in a conventional napkin absorbent core layer to prepare an absorbent product.

At this time, the absorbent product was completed by laminating an upper sheet layer 20 made of a rayon material and a back sheet layer 30 made of a polylactic acid material on the back surface of the absorbent core, on one surface of the absorbent core.

Example 7 Production of absorbent article 2

The same procedure as in Example 6 was carried out except that CMC fiber cloth of carboxymethylated substituent (DS) 0.60 prepared in Example 2 was used as an absorbent core and 3 g of wood pulp was used in combination, Respectively.

Example 8 Production of absorbent article 3

The procedure of Example 6 was repeated except that 3 g of wood pulp produced in Example 3 was mixed with an absorbent core composed of CMC fiber and a nonwoven fabric made of cotton, Respectively.

Example 9 Production of absorbent article 4

An absorbent product was produced in the same manner as in Example 6 except that 3 g of wood pulp was mixed with an absorbent core composed of the CMC fleece fabric prepared in Example 4 and a material in which cotton nonwoven fabric was mixed .

≪ Comparative Example 1 >

First, 60 g of caustic soda was dissolved in 150 ml of water, and then the cellulose nonwoven fabric was padded at a pickup ratio of 140%, followed by aging at 20 to 30 ° C for 24 hours. Second, a working solution of 80 g of MCA (mono chloroacetic acid) and 40 g of ethanol was prepared in 100 ml of water, and then the primary processed nonwoven fabric was padded with 140% and then aged at 20 캜 for 48 hours. 1, a CMC fibrillated fiber having a fiber length of 1.0 to 2.7 mm and a carboxy substituent (DS) of 0.17 was obtained.

≪ Comparative Example 2 >

An absorbent product was prepared in the same manner as in Example 1, except that the CMC fibrillated fabric of the carboxymethylated substituent (DS) 0.17 prepared in Comparative Example 1 was used as the absorbent core 10.

≪ Experimental Example 1 > Property evaluation of absorbent article

With respect to the absorbent article prepared in Example 6, the absorption magnification and the absorption velocity were measured. At this time, the absorption magnification and the absorption rate were measured by performing the standards and experimental methods notified by the KFDA, and the results are shown in Table 1 below.

The absorption performance of the absorbent article was evaluated by repeating the same procedure three times to obtain a reproducible absorbent article, and then an average value of the absorption rate and absorption rate was derived therefrom.

From the results in Table 1, it can be seen that, in the case of the absorbent product containing the CMC fiber having the degree of substitution of 0.65 as the absorbent core, the average absorption rate is measured within three seconds and the average absorption rate is absorbed within 8.1 seconds. Respectively.

≪ Experimental Example 2 > Property evaluation of absorbent article

Absorption products and absorption rates were measured for the absorbent products using the CMC fibrils of the carboxymethylated substituent (DS) 0.60 prepared in Example 2 as absorbent cores, according to standards and test methods notified by the KFDA.

At this time, the absorption performance of the absorbent article was repeated three times in the same manner to prepare an absorbent article having reproducibility, and the average value of the absorption magnification and the absorption rate was derived therefrom. The results are shown in Table 2 below.

From the results shown in the above Table 2, in the case of an absorbent product containing a CMC fibril with a degree of substitution of 0.60 as an absorbent core, the average absorption rate was measured within three to sixty seconds, and the absorption rate was absorbed within 12.60 times Respectively.

≪ Experimental Example 3 > Property evaluation of absorbent article

The absorbency and absorption rate of the absorbent articles prepared using the CMC fleece fabric prepared in Example 4 and the nonwoven fabric made of cotton as the absorbent core were measured by the KFDA, .

At this time, the absorption performance of the absorbent article was evaluated by repeating the same procedure three times to prepare an absorbent article having reproducibility, and an average value of the absorption magnification and the absorption rate was derived therefrom. The results are shown in Table 3 below.

From the results in Table 3, it can be seen that, in the case of an absorbent product comprising an absorbent core comprising a CMC fiber cloth having a degree of substitution of 0.60 and a nonwoven fabric made of cotton, the average absorption rate during three measurements is absorbed within 13.50 seconds, It was confirmed that the water absorbed 15.70 times the weight of water.

<Experimental Example 4> Evaluation of physical properties of the absorbent article

Absorption magnification and absorption rate were measured for the absorbent article prepared in Example 9 above.

The absorption magnification and absorption rate were measured in the same manner as in Experimental Example 3, and the results are shown in Table 4 below.

As a result of physical properties of the absorbent article in Table 4, it was confirmed that the average absorption rate was absorbed in 9.93 seconds after three measurements, and the absorption rate absorbed water 19 times as much as the intrinsic weight of the absorbent core.

On the other hand, absorption capacity and absorption rate of the absorbent product of Comparative Example 2 using an absorbent core composed of a CMC fiber cloth having a degree of substitution of 0.17 were measured in the same manner. As a result, the average absorption rate in three measurements was 15 seconds It was confirmed that the absorption capacity absorbed water about 9 times as much as the inherent weight of the absorbent core.

As described above, the present invention provides an absorbent core composed of a CMC fiber or fiber cloth having a degree of substitution of 0.3 or more, or an CMC fiber or a fleece thereof, by providing an absorbent core in which natural materials are mixed or mixed, It can optimize the absorbing performance of the core, and it is possible to ensure stability and natural decomposition of skin due to use of environment and human-friendly cellulosic material.

The present invention provides a biodegradable absorbent article comprising a top sheet layer made of rayon or cotton material on one side of the absorbent core and a back sheet layer made of polylactic acid or cotton on the back side of the absorbent core, By meeting the required absorption and absorption rates, it is useful in feminine hygiene products, infant diapers, and adult urinary incontinence products.

In addition, the absorbent product of the present invention can be provided with market competitiveness because of the above-mentioned CMC fiber or fibrillated material's low cost effect due to its functionalities and abundant resource utilization.

While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

10: Absorbent core
20: upper sheet layer
30: back sheet layer

Claims (7)

delete delete delete delete (CMC) fiber having a degree of substitution of 0.3 or more by continuous execution of a cold pad arrangement method (CPB method) in which cellulosic fibers or fibrils are padded with a 20 to 40% alkali solution to perform a pickup rate of 150 to 350% An absorbent core 10 obtained with a fiber cloth; or
Carboxymethyl cellulose (CMC) having a degree of substitution of 0.3 or more obtained by continuous execution of the batch method after performing the cold pad arrangement method (CPB method) in which cellulosic fibers or fibrils are padded with a 20 to 40% alkali solution to perform a pickup rate of 150 to 350% An absorbent core (10) mixed with 50 to 800 parts by weight of a natural material in the form of wood pulp, cotton fibers, or a mixture thereof with respect to 100 parts by weight of a fiber or a fibrillated fiber;
An upper sheet layer 20 made of rayon or cotton material on one surface of one of the absorbent cores selected above,
And a back sheet layer (30) made of polylactic acid or cotton material on the back surface of the absorbent core in which the upper sheet layer (20) is formed,
Wherein the absorbent core (10) is gelled when absorbed into water to have an absorption characteristic with an absorption rate of 12 times or more and an absorption rate of less than 15 seconds, as compared with an intrinsic weight of the absorbent core. 6. The biodegradable absorbent article of claim 5, wherein the absorbent article is applied to any one selected from the group consisting of feminine hygiene articles, infant diapers, and adult urinary incontinence products. delete

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