JP3018304B2 - Sanitary absorbent products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface covering material such as a diaper for small or adult use and a sanitary napkin and a sanitary absorbent product using the same.

[0002]

2. Description of the Related Art Conventionally, as a surface coating material for diapers and napkins, by subjecting a hydrophobic fiber material such as PE or PP to opening and treating with a penetrating agent, the effluent is permeable, but the fiber water A so-called dry-keeping surface coating material that prevents swelling has been used. However, depending on the person or child having an allergic constitution represented by atopic dermatitis, there is a risk that these materials become allergens. On the other hand, in connection with global environmental problems, more naturally friendly materials, that is, so-called compostability that can be reduced to the natural cycle, have microbial degradability, and at the same time have less risk of becoming an allergen It is becoming increasingly important to re-recognize cellulosic materials and research and develop their use.

However, such a cellulosic material has a high water absorption and retention property, retains discharged water, swells the contact skin part, reduces the resistance of the skin to masatsu, and the resistance to bacteria. Due to the presence of bacteria and coexisting nutrients adsorbed on the surface simultaneously with moisture,
An environment is provided in which bacteria can easily propagate, and there is a great risk of causing skin damage.

[0004] For this reason, materials are given antimicrobial properties, and specific methods are roughly divided into the following two groups A) and B).

A) Surface treatment of a constituent fiber material or its sheet material (nonwoven fabric, knitted fabric, woven fabric) with an antibacterial substance. For this purpose, various kinds of antibacterial agents of organic sulfur type, organic nitrogen type and organic phosphoric acid type are industrially used. It is easily detached from the skin, and if it is kept in direct contact with sensitive skin at all times, it has the disadvantage of causing skin damage and allergic reactions, and is extremely dangerous for use in baby products and sanitary products.

As a countermeasure, there has been developed a material (Asahi Kasei Co., Ltd.) obtained by mixing chitosan, which is a natural antibacterial material, with a polyurethane resin and coating a nylon fiber sheet. It is difficult to use for the purpose of utilizing the hydrophilicity of the material.

B) A composite fiber of an antibacterial agent and a fiber is produced by mixing and kneading an active antibacterial substance during the fiber production process of the constituent fiber material.

The antibacterial fiber obtained by such a method has a small amount of the antibacterial agent dropped off and has high safety to the skin, but has many difficulties in production. For example, the antibacterial agents used for these purposes are those obtained by adsorbing and occluding metal ions on an inorganic porous material such as zeolite or apatite, and are respectively a zeolite-Ag carrier, a zeolite-Cu carrier, and a zeolite. -Zu carrier or apatite-Ag
It is called a support, an apatite-Cu support, an apatite-Zu support, or the like. In the process of producing polyester, nylon, polypropylene, polyethylene fibers and the like obtained by melt spinning, when mixed and blended into these polymer solutions, fibers having excellent antibacterial properties can be obtained. These are used for socks and antibacterial wipes. Attempts have been made to apply these antimicrobial materials to solvent spinning such as acetate and wet spinning methods such as viscose.However, in the solvent spinning method, the antibacterial effect is degraded due to interaction with polar solvents, and wet spinning is performed. Under the law, the antibacterial activity is almost completely lost due to the influence of foreign substances, and metal-containing substances are not preferable because they may essentially move and accumulate in the human body through the skin.

[0009]

DISCLOSURE OF THE INVENTION The present invention provides a so-called diaper rash by providing a novel surface covering material for sanitary articles, thereby preventing the growth of bacteria which may cause dermatitis when worn. And at the same time, at the time of disposal, at the time of composting treatment or underground burial treatment, it is decomposed by microorganisms in the natural world and can be safely treated by a natural recycling system.

[0010]

As a method for solving the above-mentioned problems, the present invention relates to (a) a method in which a material having an effective and safe skin-protecting effect coexists with a cellulose fiber, The two points of simultaneously eliminating the drawbacks of having, for example, processing to give antibacterial properties to the cellulose fiber, and (2) devising the form so as to reduce the contact area with the skin as much as possible. It is intended to provide products that are good for the skin and environmentally friendly.

That is, the present invention relates to an absorbent product comprising an absorbent body coated with a surface covering material, wherein the surface covering material comprises chitosan-mixed cellulose fibers having antibacterial performance as a main component and 40 to 90% of pores. The sheet-like material having the following configuration is used as a limited arrangement portion (hereinafter, referred to as a sweet zone) to cover the entire area of the product surface which needs to be covered by 8%.
A sanitary absorbent product characterized in that it is constituted by using only a portion of 0 to 20%. Further, it is preferable that the ratio of the opening is 55 to 80%. Further, it is preferable to perform a surface water-repellent treatment.

[0012] In the above, the ratio occupied by the apertures of the sheet material is more preferably 55 to 80%, and the more preferable range occupied by the sweet zone is 60 to 40%. Chitosan used as an antibacterial agent in the present invention is a fine powder of natural mucopolysaccharide, which is blended into a solution of a cellulose polymer by the viscose method or a cellulose solution of an amine oxide, and then spun. It has been confirmed that even if impurities exist, the composite fiber is produced without deteriorating the activity of chitosan, and a part of the composite fiber is commercially available. (For example, Fuji Spinning Co., Ltd. "Chitopoly", "Chitocell" etc.) Chitosan is crab, shrimp or chitocel and other crustaceans, insects and various filamentous fungi such as crab, shrimp and mucopolysa in nature.
It is widely present as a complex with proteins and the like as carbide, and is used in large quantities in the fields of foods and cosmetics due to its affinity for living tissues. Chitosan exhibits an antibacterial effect due to its glucoseamine structure. Table 1 shows the antibacterial effect when 1000 ppm of chitosan was added.

[0013]

[Table 1]

FIG. 1 is an electron micrograph showing the state of addition of chitosan to viscose fibers, where the white portion is chitosan. Table 2 shows the anti-selectivity strength when chitopoly was used for various applications. In the case of nonwoven fabric, the non-selectivity resistance was discontinued.

[0015]

[Table 2]

A chitosan mixed cell having the above functions
Loin fibers and sheet-like articles made thereof can be produced by the following method.

(1) As shown in FIG. 2, fine chitosan powder is added into viscose and spun in the viscose rayon fiber production process. The fibers obtained in this manner are a. Waves are formed by a card method, and these are entangled by a high-pressure water stream to produce a nonwoven fabric. B. A yarn is made from the obtained fiber through a spinning process, and this yarn is processed into a knit or a woven fabric.

(2) As shown in FIG. 3, a chitosan fine powder is added and spun while dissolving the amine oxide in the rayon fiber production process in the solvent spinning method. The fibers obtained in this manner are a. A web is formed by a card method, and these are entangled by a high-pressure water stream to produce a nonwoven fabric. B. A yarn is made from the obtained fiber through a spinning process, which is knitted,
Process into fabric.

(3) As shown in FIG. 4, fine chitosan powder is added into viscose and spun in the process of manufacturing a direct nonwoven fabric by the viscose method. This fiber is directly converted into a nonwoven fabric.

In the present invention, it constitutes a sheet-like material comprising a chitosan mixed-cellulosic fiber obtained in this way as a surface coating material in the following manner.

As described above, in order to make the surface coating material more effective, it is important to take a method of reducing the contact area with the skin, particularly the contact area at the discharge local part.

For this purpose, there are the following two methods.

A) A porous structure having a large porosity is formed, and the area ratio occupied by the fibers is reduced as much as possible.
Conversely, it is effective to increase the space portion, for example, it is necessary to give the surface structure a shape as shown in FIGS. Opening part (AP) and fiber part (FP)
Is the total area (TA), the open area ratio = AP / T
When expressed as A × 100 (%), the aperture ratio is 40% or more,
More preferably 50-90%, even more preferably 55-90%
80% is good. A structure having a porosity of more than 90% is difficult to produce industrially. If it is less than 40%, it becomes difficult to obtain effective absorption. In order to form these forms, it is effective to use a so-called spun lace method for a nonwoven fabric, which has a hole or a combination of a hole and a projection, and is treated with a high-pressure water flow on a roller. .

In the case of a woven fabric or a knitted fabric, it is necessary to reduce the constituent denier of the spun yarn or the filament yarn as much as possible to create a loose structure. For this purpose, a so-called knitted fabric is preferable.

The nonwoven fabric, P having a heat set of chitosan mixed-cellulosic fibers in order to stabilize the tissue in the case of knitted
It is also effective to mix with fibers having low-temperature solubility such as E / PP, heat-set after molding, and heat-fix the contact points between the fibers.

In order to control the unavoidable hydrophilicity and water absorption of the cellulose fiber, it is also effective to apply a surface treatment with a safe water repellent, for example, a silicone emulsion or a tetrafluoroethylene emulsion. In that case,
It is necessary to maintain pores that do not impair the physical permeability of the surface liquid.

B) In the second method, in order to maintain a balance between the dry-keeping performance and the antibacterial performance, the concentrated method is used only in a portion (suite zone) particularly requiring antibacterial properties.
The other part is a method in which a conventional nonwoven fabric is used in combination. Examples of this method are shown in FIGS.
Indicated by Arranged sheet consisting of chitosan mixed cellulose fibers <br/> the portion of figure Q, as a part of the P, the so-called dry-keep of thermal bond or spun bond nonwoven fabric of P P which has been used May be used. In some cases, it is effective to substitute the portion P with the upper surface of the absorber and use only the portion Q. In this case, the upper surface of the absorber needs to be treated to substitute for the surface covering material. The structure of the part Q is configured in consideration of the properties of excretions such as urine, stool or blood, local excretion, sex, body shape, and the like.
If P + Q = T (total surface area of coating material), Q / T × 10
0 = 80 to 20%, preferably 60 to 40%. 8
If it exceeds 0%, the meaning of the sweet zone is weakened, and 20
%, A sufficient sweet zone area cannot be formed.
Note that the relationship between the sweed zone forming the Q portion and the nonwoven fabric forming the P portion can be made to coexist on the same plane portion as described above. However, as shown in FIG. It is also possible to provide an arrangement as shown in FIG.

The present invention is constituted by a combination of the above A) and B). That is, according to the present invention, a chitosan-mixed cellulose fiber formed into a sheet having an aperture structure as shown in FIGS. 5 to 9 partially forms a sweet zone as shown in FIGS. 10 to 17. The surface coating material is formed in such a state that the surface coating material is distributed so as to obtain a new sanitary absorbent product such as a sanitary product, a diaper and the like, which has a small skin rash.

[0029]

【Example】

Example 1 << Preparation of Nonwoven Fabric >> CS ₂ is reacted with alkali cellulose according to the process shown in FIG. 3 to prepare an aqueous solution of cellulose xanthate, so-called viscose. To this viscose was added a dispersion of fine powder of chitosan in which a masterbatch was prepared, to prepare viscose containing 4% chitosan with respect to cellulose. This viscose composition has 6.3% cellulose, 4% alkali, and 60 santeates.
%Met. After defoaming and filtering this viscose,
After spinning out ₂ SO ₄ , ZnSO ₄ and Na ₂ SO ₄ into a spinning bath, 1
After the tow obtained by stretching to 20% is cut at 45 m / m, regeneration, desulfurization, bleaching, washing with water and drying are performed to obtain 1.5%.
Staple cotton (trade name Fujipolyquinopoly) of chitosan-containing rayon fiber of d × 45 m / m was produced. A card web (random card manufactured by Helges) of 35 g / m ² was prepared from 100% of this rayon staple cotton, and the web was guided on a net, degassed by a water flow, and disclosed in JP-A-62-69867. With numerous protrusions like
Dehydration and drying after treatment with a three-stage nozzle with a high-pressure water flow of 50 kg / cm ² on a cylinder having a dehydration hole,
A nonwoven fabric made of chitosan-containing fibers having a pattern as shown in FIG. 6 was obtained. The open area ratio was 70%.

{Antibacterial Test} The following antibacterial test was performed using the above nonwoven fabric. That is, a non-woven fabric made of a normal rayon fiber entangled with a similar high-pressure water flow as a blank was cut into a circular shape having a diameter of 3 cm, and the non-woven fabric was cut into a circular shape having a diameter of 3 cm on an agar medium. Steam high pressure sterilization was performed. After inoculating Staphylococcus aureus on the sterilized nonwoven fabric, and cultured for one week in a constant temperature bath at 40 ° C.,
Colonies were generated on the entire surface of the blank, but in the case of the nonwoven fabric of this example, there was almost no change compared to the time of seeding.

{Processing into Diaper} Using a nonwoven fabric having the above-mentioned properties as a surface material of a child's diaper, its performance was compared.

Three types of samples A, B and C shown in the following Table 3 were prepared by using commercially available diapers of M size and changing the surface material. The sample C had a hydrophilic polyester and a hollow fiber web of 20 g / hour in order to prevent leakage of the polymer and pulp from the aperture of the apertured top sheet.
The m ² was used as a cushioning layer in superposed non-woven fabric of the present invention the portion of Q. The area ratio of Q is about 42%
Met.

[0033]

[Table 3]

A piece of each of A, B, and C was made, subjected to a lab test, and then subjected to a use test. Table 4 shows the results.

[0035]

[Table 4]

According to the results of the lab test, C was combined with the effect of the cushion layer, had a high permeation rate, and had a re-wet value not much different from that of A irrespective of the hydrophilic material. As a result of the use test, the rash rate was low, and the evaluation of the consumer was higher than A and B.

Example 2 {Preparation of Nonwoven Fabric} Chitosan-containing viscose is prepared according to the process shown in FIG. Its viscose composition was 6.0% cellulose, 4.2% alkali, and 80% santeate value. The content of chitosan was 5% of cellulose. 9g of this viscose with formaldehyde
/ L, 40 g / l of Na ₂ SO _{4 and} 28 g / l of H ₂ SO ₄ into a spinning bath, stretched 140% in a bath at 50 ° C., and then tow made of 1.5 d synthetic fiber. Get.
This tow is dispersed in a large amount of water while being cut to 10 m / m, a fiber mat is formed by a wet method, partially fused by an embossing roll, and the obtained binding sheet is shrunk and regenerated in an acidic bath. . Thereafter, desulfurization, bleaching, washing with water, and drying are performed to obtain a continuous nonwoven sheet. This sheet was made by a process according to TCF manufactured by Nimura Chemical Co., Ltd., which was introduced on a 16-mesh plastic net, treated with a high-pressure water stream (30 kg / cm ² ) using a two-stage nozzle, and dried. As a result, a nonwoven fabric having an open state was obtained as shown in FIG. The open area ratio was about 52%.

<< Antibacterial Test >> An antibacterial test was performed using the nonwoven fabric obtained as described above. Micrococcus luteus was selected as a bacterial species, and a culture test was performed by a shake culture method using a flask using a liquid medium. That is, as the specimen, the above nonwoven fabric (blank), one-time washing, two-time washing, and three-time washing were used. 1 g of each specimen was placed in a flask containing a liquid medium and subjected to high-pressure steam sterilization. The cells were planted, and cultured with shaking in a thermostat at 38 ° C. for one week. The MIC value (ppm) of the blank was 20 ppm. The concentration of chitosan in the sample was equivalent to 200 ppm, and almost no growth of bacterial cells was observed. Table 5 shows the comparison of the antibacterial levels of the other samples when this blank was taken as 100%.

[0039]

[Table 5]

Thus, the three-time laundry also showed stable antibacterial properties.

{Processing into Diaper} The above nonwoven fabric having an aperture was subjected to a water-repellent treatment only on the surface by Teflon spray. Using the non-woven fabric as shown in FIG. 12, a thermal bond non-woven fabric is used for the P part, and the surface part of the commercially available pampers is removed for the Q part using the example product. And evaluated its performance. A commercially available diaper was used as a blank, and a thermally bonded nonwoven fabric as shown in Table 6 was used for comparison with the product of the present invention.

[0042]

[Table 6]

The product of the present invention has a high permeation rate and a Re-wet
The value was not much different from the polypropylene nonwoven fabric.

Example 3 {Preparation of Nonwoven Fabric} A 5% O.S. of piscose rayon obtained in the same manner as in Example 1 was prepared. W. F chitosan-containing fiber (1.5d × 51m /
m) and white cotton (average fiber length 30 m / m) composed of 60% chitosan-containing fiber and 40% cotton 3
A web of 0 g / m ² was prepared, and the web was entangled with a high-pressure water stream by the same process as in Example 1 to obtain a nonwoven fabric having an open structure as shown in FIG. 58% porosity
Met.

{Processing into Diaper} The above nonwoven fabric was used in a pattern shown in FIG. 14 by superimposing it on a commercially available nonwoven fabric as shown in FIG. The nonwoven fabric corresponding to P is 18 g / m ² of polypropylene spunbond (hydrophilic treatment), and Q is obtained according to the present example. The area ratio occupied by Q is about 30%
Met.

As a diaper sample, a surface material of a commercially available M-size diaper was removed, and a comparative test was performed between a sample using spunbond as a blank and the product of the present example. Table 7 shows the results.

[0047]

[Table 7]

As described above, the product of the present invention showed extremely good results in both the permeability and the re-wet property in the test results.

[0049]

According to the present invention, there is provided a hygienic article surface covering material having a novel structure, and by applying the same to a diaper or the like, it is possible to prevent the growth of bacteria which may cause dermatitis when worn. This makes it possible to prevent so-called diaper fogging, and at the same time, to be decomposed by microorganisms in the natural world during composting or burying in soil at the time of disposal, and to be safely processed by a natural recycling system.

[Brief description of the drawings]

FIG. 1 is an electron micrograph showing the state of addition of chitosan to viscose fibers.

FIG. 2 is a production process diagram of a chitosan-added rayon fiber.

FIG. 3 is a production process diagram of a method of adding chitosan to rayon fiber in a solvent spinning method.

FIG. 4 is a manufacturing process diagram of a method of adding chitosan to a nonwoven fabric by a viscose method.

FIG. 5 is an explanatory diagram of an example of a shape of an opening portion of a surface covering material.

FIG. 6 is an explanatory diagram of another example of the shape of the opening of the surface coating material.

FIG. 7 is an explanatory view of another example of the shape of the opening of the surface covering material.

FIG. 8 is an explanatory diagram of another example of the shape of the opening of the surface covering material.

FIG. 9 is an explanatory view of another example of the shape of the opening of the surface covering material.

FIG. 10 is an explanatory diagram of an example of a configuration when a coating material according to the present invention is used for a sweet spot.

FIG. 11 is an explanatory diagram of an example of another configuration when the coating material according to the present invention is used for a sweet spot.

FIG. 12 is an explanatory diagram of an example of another configuration when the coating material according to the present invention is used for a sweet spot.

FIG. 13 is an explanatory diagram of an example of another configuration when the coating material according to the present invention is used for a sweet spot.

FIG. 14 is an explanatory diagram of an example of another configuration when the coating material according to the present invention is used for a sweet spot.

FIG. 15 is an explanatory diagram of an example of another configuration when the coating material according to the present invention is used for a sweet spot.

FIG. 16 is an explanatory diagram of an example of another configuration when the coating material according to the present invention is used for a sweet spot.

FIG. 17 is an explanatory diagram of an example of another configuration when the coating material according to the present invention is used for a sweet spot.

FIG. 18 is an explanatory diagram of an example in which a coating material according to the present invention is overlaid on a lower layer of a nonwoven fabric.

FIG. 19 is an explanatory diagram of an example in which a coating material according to the present invention is overlaid on an upper layer of a nonwoven fabric.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ identification code FI D01F 2/10 A61F 13/18 381 // D01F 1/10 (58) Field surveyed (Int.Cl. ⁷ , DB name) A61F 13/49-13/496 A61F 13/15 A61F 13/511-13/513 D01F 2/10 D01F 1/10

Claims (4)

(57) [Claims] 1. An absorbent product comprising an absorber coated with a surface coating material, wherein the surface coating material comprises chitosan-mixed cellulose fiber having antibacterial performance as a main component.
A sheet-like material having an opening of about 90% was used as a limited arrangement part (hereinafter referred to as a sweet zone) for only a part of 80 to 20% of the entire area of the product surface required to be covered. An absorbent product for hygiene characterized by that. 2. The sanitary absorbent product according to claim 1, wherein the ratio of the opening is 55 to 80%. 3. The sanitary absorbent product according to claim 1, wherein the sweet zone occupies 60 to 40% of the total area of the product surface required to be covered. 4. The sanitary absorbent product according to claim 1, which is subjected to a surface water repellent treatment.