KR20020056227A - Absorption Product with Liquid Permeability Upper Sheet of which Softness and Absorption Speed are Elevated - Google Patents

Abstract

PURPOSE: Provided is a disposable absorbent including a liquid transparent top sheet with softness and absorption speed improved which improves softness to reduce friction with skin and quickens absorption speed to improve consumers' preference. CONSTITUTION: In the disposable absorbent which includes the liquid transparent top sheet, a liquid opaque back sheet and an absorbent between the top sheet and the rear sheet, the disposable absorbent including the liquid transparent top sheet with softness and absorption speed improved comprises the parts of: a two-component fiber layer(29,30) which is placed over the liquid transparent upper sheet to include polypropylene as a fiber nucleus component to determine strength of fiber and polyethylene or polyester as an external component to wrap the fiber nucleus component; and a thermal fusion non-textile cloth which is configured as a polypropylene fiber layer at the lower part.

Description

Absorption Product with Liquid Permeability Upper Sheet of which Softness and Absorption Speed are Elevated}

The present invention relates to a disposable absorbent article having a liquid permeable topsheet with improved softness and absorption rate.

A general disposable absorbent product is a product that absorbs body fluids excreted by various physiological actions, that is, a product that absorbs urine, feces, menstrual discharge and vaginal discharge, and more specifically, disposable diapers used by infants or incontinence ( Disposable Diaper, Women's Sanitary Napkin, Panty Liner, etc.

The disposable absorbent article of the present invention is preferably applied to a disposable diaper. Therefore, the disposable absorbent article of the present invention will be described below as an example.

Disposable diapers consist of a liquid permeable top sheet that is in direct contact with the wearer's skin when worn, a liquid impermeable back sheet that forms an outer surface when worn, a liquid permeable top sheet and a liquid impermeable It is composed of an absorbent core (absorbent core), waist band, coagulation band, leg elastic body and the fastening means located between the rear sheet.

Among the components of these disposable diapers, the liquid permeable topsheet is a synthetic nonwoven fabric or a perforated film used to allow body fluids to quickly pass through the absorbent body.

Synthetic nonwoven fabric is an absorber Hydrophilic treatment is usually used for hydrophobic fibers for fast delivery.

In addition, the absorber is typically composed of fluff pulp, super absorbent polymer and tissues for packaging the absorbent body, and absorbs body fluid through the liquid permeable top sheet at a high speed. And absorbs and retains the body fluid to prevent the absorbed body fluid from contacting the skin again.

The liquid impervious backsheet prevents body fluids absorbed by disposable diapers from leaking underneath the absorber to contaminate the wearer's clothing or the surrounding environment.It mainly uses polyethylene film, and the nonwoven fabric is applied to the polyethylene film. Adhesion may also improve the softness of the material.

The waistband forms an elastic body in the waist portions at both ends in the longitudinal direction of the disposable diaper to form elasticity at the waist portion to maintain the disposable diaper to the wearer, and improve the fit of the waist portion.

A coagulation band is formed outside the absorbent body of the disposable diaper, and an elastic body is attached to the hydrophobic nonwoven fabric or the waterproof sheet to prevent leakage of urine and feces that cannot be absorbed from the absorbent body, thereby forming a leakage preventing pocket.

The leg elastic body typically forms an elastic body on the sheet of the liquid impermeable waterproof sheet and the nonwoven layer outside the coagulation band to form the final leakage preventing means.

And it includes a fastening means consisting of a re-adhesive fastening means and a front fastening means to maintain the disposable diaper so configured to the body.

Each material is also adhesively fixed by hot melt adhesive, heat fusion or other bonding method.

Disposable Diapers, Disposable Diapers, Adult Diapers and Women's Sanitary Napkins are disposable absorbent products. Adjustable so that there is no inconvenience Accordingly, the development of disposable diapers has been progressing toward improving the wearing comfort in meeting basic performance. One way to do this has emerged ultra-thin disposable diapers that make the absorber thinner.

This ultra-thin diaper provides a cushioning function upon contact with the skin in the conventional disposable diaper, and reduces the amount of downy pulp that speeds up the initial absorption rate during urination . The upper sheet is relatively complementary to the function of the downy pulp. Therefore, the nonwoven fabric used on the absorber has been strengthening the function of the nonwoven fabric by varying the fiber, thickness, basis weight, number of layers of the nonwoven fabric. The non-woven fabric used as the liquid permeable upper sheet is an air-through non-woven fabric through which a yarn is melted and bonded by a hot air room through a thermal bond nonwoven fabric in which a yarn is melted and bonded by a heated pressing roll according to a manufacturing method. (Air-Through Nonwoven) is mainly used.

In order to soften the nonwoven fabric, the air-through nonwoven fabric is composed of polypropylene as the core component of the fiber, which is a strong component that determines the strength of the fiber, and the outer component surrounding the core component is made of softer polyethylene or polyester. Bicomponent fiber is used.

The air-through non-woven fabric made of these two-component yarns is soft and bulky, but expensive, so it is economically expensive to use as a disposable diaper, and leakage occurs at the portion that is combined with a coagulation band adhesive point formed as a leak-proofing means of the disposable diaper. It is very likely to create a passageway. In addition, the strength of the nonwoven fabric is often a problem that the lint occurs due to the loosening of the fibers during the use of disposable diapers. Unlike the yarn of the heat-sealed nonwoven fabric is a fiber composed of a single component of polypropylene, there is an advantage that the price is cheaper than the fiber composed of a bicomponent yarn, but the disadvantage is that the softness and absorption rate is low.

The present invention has been made in order to solve the above problems, the real name is that the purpose of the foot is not only less friction with the skin is improved softness, but also has an excellent absorption rate and excellent liquid permeability upper sheet consumer preference To provide a disposable absorbent product.

1 is a plan view of a disposable absorbent article of the present invention.

2 is a partial cross-sectional view taken along the line A-A of FIG. 1.

3 is a partial cross-sectional view taken along the line B-B in FIG. 1.

Figure 4 is a plan sectional view showing another embodiment of the disposable absorbent article of the present invention.

5 is a partial cross-sectional view taken along the line A-A of FIG. 4.

6 is a vertical cross-sectional view of the liquid permeable top sheet of FIGS. 1 and 4.

<Description of Major Symbols in Drawing>

6.Liquid permeable top sheet 29: Upper layer of liquid permeable top sheet 30: Lower layer of liquid permeable top sheet 31: Nucleus of bicomponent fibers

In order to achieve the above object, the present invention provides a disposable absorbent article comprising a liquid permeable top sheet, a liquid impermeable back sheet, and an absorbent body inserted and fixed between the top sheet and the back sheet, wherein the liquid permeable top sheet is The upper layer includes a bicomponent fiber layer composed of polypropylene as a fiber nucleus component for determining the strength of the fiber and polyethylene or polyester as a soft component as the outer component of the fiber surrounding the nucleus component of the fiber; Its lower layer provides a disposable absorbent article, characterized in that it is a thermally fused nonwoven fabric composed of a polypropylene fiber layer to reinforce strength.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view when the present invention is unfolded.

Disposable diaper (D) has an hourglass-like appearance divided into the front waist (1), the crotch (2) and the back waist (3). The outer shape of the disposable diaper (D) does not necessarily have to be symmetrical structure in left and right and front and rear, but preferably has a symmetrical structure.

2 is a partial cross-sectional view showing a cross-sectional structure cut by the A-A line in the crotch portion of FIG.

3 is a partial cross-sectional view showing a cross-sectional structure cut by the B-B line at the waist portion of FIG.

FIG. 4 shows a case in which the leg elastic body 27 is included as another embodiment of FIG. 1, and FIG. 5 is a partial cross-sectional view showing a cross-sectional structure taken along the line A-A of FIG.

6 shows a vertical section of the liquid permeable upper sheet 6 in FIGS. 1 and 4.

The present invention inserts the absorbent body 5 between the liquid impermeable backsheet 4 and the liquid permeable upper sheet 6 to fix it using a hot melt adhesive. In the present invention, the liquid permeable upper sheet 6 is The thickness of the absorbent body 5 becomes thin, it maintains quick absorbing power during urination and provides cushioning function to the skin, and the size of the liquid permeable upper sheet 6 is larger than the gap between the curing band flap adhesion portions 18 on both sides of the curing band 7. If small, a liquid permeable second nonwoven fabric 8 may be used. The liquid permeable second nonwoven fabric 8 diffuses permeated urine, blocks the transfer of absorbed urine from the absorbent body 5 to the liquid permeable upper sheet 6, and protects the absorbent body 5 from being absorbed. do.

The absorbent material 5 is a fluffy pulp 12, a super absorbent polymer 13, a superabsorbent polymer 13, and a tissue wrapping the same. It depends on the content of (13). In the present invention, the shape of the absorbent body 5 may be formed in a shape other than a T-shaped shape as well as an hourglass shape and a straight shape. From absorber (5) A pocket is formed to trap the bodily fluid that escapes.

The rotatable band 7 includes the rotatable band flap adhesive portion 18, the rotatable band end portion 14, the rotatable band end adhesive portion 20, the rotatable band elastic body 17, the rotatable band flap 21, and the rotatable band flap 25. ), And at least the crotch band flap 21 has an absorbent pocket outside the absorbent body 5 by the curd band elastic body 17 at the crotch portion.

As for the coagulation band 7, a hydrophobic nonwoven fabric or a waterproof nonwoven film may be used. In the case of the hydrophobic nonwoven fabric, the coagulation band flap 21 is formed in two layers to enhance the hydrophobic effect. It can also adhere | attach between.

In addition, the rotatable band 7 may include one or more elastic bodies 17 on the rotatable band flap 21 between the rotatable band flap adhesive portion 18 and the rotatable band end portion 14 so that the rotatable band end portion 14 closely adheres to the baby skin. ), The elastic modulus of the solidified band elastic body 17 is formed to 150 to 230%, preferably 180 to 200%. In addition, the elastic modulus of the coagulation band elastic body 17 may be formed to have an inclination by increasing the elasticity modulus of the elastic body as it becomes closer to the coagulation band end portion 14 or closer to the coagulation band adhesion portion 18. The elastic band elastic body 17 is mainly used for the elastic yarn, the elastic yarn uses a polyurethane spandex (Polyurethane Spandex) or natural rubber.

The rotatable band end portion 14 is a portion where the rotatable band flap 21 is in contact with the baby skin, and the rotatable band flap adhesion portion 18 has the rotatable band flap 21 having a side flap outside the disposable diaper (D) absorbent body 5. It is a part bonded to the longitudinal direction of the disposable diaper D to (22). The side flap 22 on the outer side of the coagulation band 7 is a flexible material in which the nonwoven fabric layers 6 and 8 and the liquid impermeable back sheet 4 are adhered to the liquid impermeable back sheet 4 on the outer side of the absorber 5. It consists of a sheet. Alternatively, it may be formed only of the liquid impermeable backsheet 4 layer, or may be formed of the liquid impermeable backsheet 4 and the coagulation band side flap 25. The rotting band side flap 25 refers to an outwardly extending flap including the rotting band flap attachment portion 18. In at least the crotch portion 2 of the disposable diaper D, the side flap 22 has an inner side flap 23 and an outer side flap along which the flap adhesive portion 18 of the coagulation band is along the longitudinal bonding point of the disposable diaper D. (24) and the outer side flap end 26, which is the end of the outer side flap. The width of the outer side flap 24 is limited to 20 to 50 mm when the elastic body is not formed on the outer side flap 24 with the length from the corresponding band flap adhesive portion 18 to the outer side flap end 26. Is set to 15 ~ 35mm. When the outer side flap 22 width is formed to be less than 10 mm and 50 mm or more, it is not preferable because it inhibits the appearance image of the disposable diaper (D).

However, when the elastic body is formed on the outer side flap 24 to form the leg elastic body 27 as shown in FIGS. 4 and 5, the outer side flap end 26 is formed by the outer leg elastic body 28 of the outer side flap 24. Keep the length up to 15 ~ 20mm. In addition, when the width length is less than 15 mm and 20 mm or more from the outer leg elastic body 28, it is not preferable because it inhibits the external appearance image of the disposable diaper (D). The leg elastic body 27 is formed with leakage preventing means together with the solidification band 7 of the present invention, and at least one elastic body is formed on the side flap 24 outside the solidification band flap adhesion portion 18 with the liquid impermeable backsheet 4. The hot band adhesive is attached between the coagulation band side flap 25 or the liquid permeable upper sheet 6 at least in the crotch portion 2 in the longitudinal direction of the disposable diaper D.

The rotatable band end adhesive portion 20 is a longitudinal direction of the disposable diaper D such that the rotatable band flap 21 forms an absorbent pocket outside the absorber 5 by the rotatable band flap adhesive portion 18 and the rotatable band elastic body 17. Refers to an adhesive portion for fixing the coagulation band flap 21 to the inside or outside of the coagulation band flap adhesion portion 18 at both end edge waist portions 1 and 3. The coagulation band end adhesive portion 20 is formed to be partially fixed on the absorber 5, and preferably formed so that a non-bonded portion does not occur in the side flap 22 portion outside the absorber. The length of the coagulation band end adhesive portion 20 is formed to be typically 50 to 100 mm in the waist portions 1 and 3 of the disposable diaper (D).

In addition to the disposable diaper (D) forms a fastening means and a waistband 11 to be worn and maintained on the baby body. The fastening means is mainly composed of the fixing portion 19 of the reattachment fastening means fixed to the edge of the side flap 22 of the waist of the back side of the disposable diaper and the free end of the non-fixed fastening means 16 and the front waist portion ( It is formed in the transverse direction of 1) and consists of the front fastening means 15 to provide a target (Target) region to which the re-adhesive fastening means 16 can be bonded. The re-adhesive fastening means 16 may be formed systematically such that the adhesive layer has elasticity and non-elasticity in the form of a tape including a hook. The front fastening means may be formed in the form of a polyethylene film or a loop tape.

The waist band 11 is formed by bonding an elastic body to the waist portions 1 and 3 of the disposable diaper D. Waistband elastomer is mainly used polyurethane foam (Polyurethane Foam), polyurethane film (Polyurethane Film), polyurethane nonwoven elastomer and elastic yarn, the elastic yarn is used polyurethane Spandex (polyurethane Spandex) or natural rubber. The waist elastic of the waistband 11 may be formed over the entire product width in the transverse direction between the longitudinal end end of the disposable diaper D and the outer side of the absorbent body 5, or may be partially shortened.

The nonwoven fabric used as the liquid permeable upper sheet 6 is passed through a thermal bond nonwoven fabric in which the yarn is melted and bonded by a heated pressing roll according to a manufacturing method, and the yarn is bonded by hot air. Air-through nonwovens are mainly used.

6 shows an enlarged cross-sectional structure of the liquid permeable upper sheet 6 in FIGS. 1 and 4, showing a single nonwoven fabric composed of two layers. The upper layer portion 29 of the liquid permeable upper sheet softens the nonwoven fabric. It is a bicomponent fiber composed of polypropylene as the core 31 component of the fiber, which determines the strength of the fiber, and an outer component surrounding the core component as a softer polyethylene or polyester component. The lower layer part 30 of the upper sheet 6 shows that it consists of a single component polypropylene fiber.

The basis weight mainly used for the liquid permeable upper sheet 6 is 16 to 30 g / m 2, and preferably 20 to 26 g / m 2. The softness of the liquid permeable upper sheet 6 depends mainly on the content of the bicomponent fibers constituting the nonwoven fabric, and the content of the bicomponent fibers is used at least 15% of the total basis weight of the liquid permeable upper sheet 6. In the present invention, the liquid-permeable upper sheet 6 is a bicomponent fiber and a monocomponent fiber, each of which is transported by forming a sheet of one fibrous layer and forming a sheet in a thermocompression roll to be fused and used less than 15% of fibers. In the case of forming a fibrous layer, sheet formation of a certain thickness is insufficient and thickness deviation occurs, and a function is insufficient in use.

Hereinafter, the present invention will be described in the following Examples and Comparative Examples.

Example 1

In a known disposable diaper having a liquid permeable upper sheet, a liquid impermeable back sheet, and an absorbent body inserted and fixed between the upper sheet and the back sheet, forming a coagulation band and leg elastic body as a leakage preventing means, and having a waist band and a fastening means. Wherein the liquid permeable top sheet is a Thermal Bond nonwoven composed of a layer of bicomponent fibers and a monocomponent fiber layer of polypropylene, wherein the basis weight of the liquid permeable top sheet is 24 g / m ² , The weight specific gravity of the fibrous layer was 25% of the entire upper sheet, and the bicomponent fibers were made of disposable diapers using fibers composed of polyethylene / polypropylene.

Example 2

In Example 1, the bicomponent fibers of the liquid permeable upper sheet were made of disposable diapers using fibers composed of polyester / polypropylene.

Comparative Example 1

In Example 1, the liquid permeable upper sheet was used to prepare disposable diapers using the upper sheet prepared by mixing the polyethylene / polypropylene bicomponent fibers and the polypropylene monocomponent fibers without layering.

Comparative Example 2

The liquid permeable topsheet in Example 1 was used to prepare disposable diapers using the topsheet made by mixing non-layered polyester / polypropylene bicomponent fibers and polypropylene monocomponent fibers.

Comparative Example 3

The liquid permeable topsheet in Example 1 produced disposable diapers using the topsheet made of polypropylene monocomponent fibers.

In order to measure the softness of the disposable diapers prepared according to Examples 1 and 2 and Comparative Examples 1 to 3, the friction coefficient was measured and compared to Table 1, and the urine rate of the upper sheet was measured and shown in Table 2. The consumer evaluation on the softness of disposable diapers with a liquid permeable upper sheet was conducted on five scales of consumer reviews for 100 people, and the results are shown in Table 3.

Friction Coefficient Measurement Results of Liquid Permeable Upper Sheet of Disposable Diaper Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Average friction coefficient 1.22 1.20 0.91 0.90 0.84

In the above table, the average friction coefficient was measured using a KES-SE friction tester (Kato Tech Co., Japan).

The larger the mean coefficient of friction, the larger the contact area between the surface and the surface contactor, which is softer with unevenness on the surface.

Absorption rate of liquid permeable upper sheet Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Absorption rate (sec / 5ml) 4.18 4.17 5.85 5.90 6.73

In Table 2, the urine absorption rate was measured by applying 5 ml once at a rate of permeation of the liquid permeable upper sheet in a 0.9% Nacl aqueous solution and applying the second time at the same point after 5 minutes. Lister (Austria lenzing AG Co .) Was used.

Consumer verification of the softness of disposable diapers Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Consumer rating 3.82 3.80 3.40 3.41 3.38

(5-point scale, N = 100)

5-point scale: 5 points --- Very soft, 4 points ---- Soft, 3 points Normal

2 points --- not soft, 1 points --- not very soft

Table 1 above shows the softness due to the coefficient of friction of the liquid permeable upper sheet between the Example product and the comparative product, Table 2 shows the secondary absorption rate of the liquid permeable upper sheet, Table 3 shows the liquid permeable upper The result of the consumer verification about the softness with respect to the disposable diaper manufactured using the sheet | seat was shown. As shown in Tables 1 to 3, in the present invention, the Example product showed better softness and consumer preference of the liquid permeable upper sheet than the Comparative Example product.

As described above, the liquid permeable upper sheet of the disposable absorbent article of the present invention is excellent in softness and absorption rate, and excellent in consumer preference.

Claims (5)

A disposable absorbent article comprising a liquid permeable top sheet, a liquid impermeable back sheet, and an absorbent body interposed between the top sheet and the back sheet, wherein the liquid permeable top sheet, the upper layer portion, is a fiber nucleus component that determines the strength of the fiber. A bicomponent fiber layer composed of polypropylene or polyethylene or polyester which is a soft component as an outer component of the fiber surrounding the nucleus component of the fiber; Disposable absorbent product having a liquid permeable top sheet with improved softness and absorption rate, characterized in that the lower layer is a heat-sealed nonwoven fabric composed of a polypropylene fiber layer. The disposable absorbent article according to claim 1, wherein the bicomponent fiber layer contains 15% or more of the total weight of the liquid permeable upper sheet. The disposable absorbent article of claim 1 wherein the basis weight of the liquid permeable upper sheet is 16-30 g / m ² . The disposable absorbent article according to claim 1 or 3, wherein the basis weight of the liquid permeable upper sheet is 20 to 26 g / m ² . The disposable absorbent article of claim 1 wherein the disposable absorbent article is a disposable diaper.