JP3390723B2 - Disposable absorbent article - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening tape type disposable diaper or a disposable absorbent article such as a sanitary napkin, and particularly preferably, a disposable type disposable diaper which is used in combination. Can be applied to diapers.

[0002]

2. Description of the Related Art Conventionally, disposable absorbent articles such as disposable paper diapers and sanitary napkins have been provided with leak-proof gathers, three-dimensional gathers, double cuffs and other leak-proof means around the user's legs. ing. However, this type of leakproof means cannot prevent leaks from the back and abdomen of the user, and therefore, in recent years, leakproof gathers have been gathered on the waist of the user as disclosed in JP-A-3-195556. , Those with leakage prevention means such as three-dimensional gathers and double cuffs are used.

Also, in a disposable paper diaper or the like provided with this type of leakproof means, when the amount of body fluid is large and a larger absorption power is required, particularly when it is used as an adult diaper, From the viewpoint of absorbability and economy, the pad type diaper is used as a supplementary layer on the absorbent body. In the following description, unless otherwise specified, the absorbent pad or the pad-type diaper that is stacked on the use surface side of the main body of the paper diaper is called "auxiliary pad".

[0004]

However, when the auxiliary pad is laid on the use surface of the product paper diaper main body when worn, the thickness of the absorber of the auxiliary pad to be superposed is added, and the auxiliary pad is attached to the absorbent body of the main body of the diaper diaper. Due to the increase in overall rigidity due to the double absorbent body, free deformation of the waist barrier cuffs is obstructed, and it is difficult to adhere to the skin no matter how wide the waist barrier cuffs are raised. It was found that the function was not fully exerted.

Although it is assumed that the gathering strength of the gathers is increased to secure the adhesion to the skin,
There is a problem in that an excessive contraction force makes the wearer feel a feeling of pressure and makes the wearing feeling significantly inferior. In addition, when gathers are provided on the waist flap portion, the product contracts in the width direction, making it difficult to see the center of the product. This causes a mounting deviation, and as a result, causes the product to not exhibit its full function.

[0006] Therefore, a main object of the present invention is to provide a disposable absorbent article which has a high effect of preventing leakage of the waist portion and is excellent in wearing sensation, whether it is used alone or when the auxiliary pads are stacked. It is in.

[0007]

The present invention which has solved the above-mentioned problems is as follows. <Invention of Claim 1> In a disposable absorbent article having a waist barrier cuff that stands up freely in a use state on at least one end of a product in the longitudinal direction, the barrier cuff is doubled by a barrier sheet. Formed in
The base of the double-layered barrier sheet is fixed to the surface of use of the product, and the boundary between this fixed part and the unfixed standing area extending to the standing distal edge is the proximal edge of the waist barrier cuff. , Between the double barrier sheets
Within the product longitudinal range, near the distal edge and within the standing area
Elastic elastic members are provided near the proximal edge of the
Disposable absorbent articles have, characterized in that.

<Invention according to claim 2> The disposable absorbent article according to claim 1, wherein the standing region of the waist barrier cuff has a length in the product longitudinal direction of 10 mm or more.

<Invention of claim 3> The disposable absorbent article according to claim 1 or 2, wherein the elastic stress of the elastic elastic member near the proximal edge is greater than the elastic stress of the elastic elastic member near the distal edge. Goods.

<Invention of Claim 4> 20 to 90 of the portion where the elastic stretchable member is disposed near the distal edge.
The stress at the time of% elongation (width 15 mm, length 100 mm) is 0.05 to 1.00 N, and the stress at the time of 20 to 90% elongation of the portion where the elastic expansion and contraction member near the proximal edge is arranged (width) 15mm, per 100mm length) is 0.10
The disposable absorbent article according to any one of claims 1 to 3, wherein the stress is 1.50 N, and the stress in the latter is larger than that in the former.

(Advantageous Effects of Claims 1 to 4) By using a double barrier sheet, not only the leakproof property is enhanced, but also the shape retention property particularly as a waist barrier cuff is improved, so that the barrier sheet can be turned up during wearing. The effect of preventing leaks is high. Other functions and effects will be described more clearly with the embodiment, and will be described later.

<Invention of Claim 5> Any one of claims 1 to 4, wherein the outer edge in the longitudinal direction of the product of the fixed portion of the barrier cuff for waist is 1 to 40 mm inside from the longitudinal edge of the product. The disposable absorbent article according to item 1.

(Effect) When the outer edge in the product longitudinal direction of the fixed portion of the barrier cuff for waist is made to be along the longitudinal edge of the product, this edge causes a large amount of overlap of the sheets and the adhesion Since it becomes hard by having the agent, it may damage the skin of the user. However, in the present invention, as shown in FIG. 4 and FIG.
Since it is arranged along E3 which is 1 to 40 mm inside from the longitudinal edge E7 of the product, there is no such possibility.

<Invention of Claim 6> A waterproof sheet is sandwiched between double barrier sheets,
The disposable absorbent article according to any one of claims 1 to 5.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below with reference to the embodiments shown in the drawings. The disposable absorbent article of the present invention can be applied to napkins and the like in addition to disposable diapers, but in the following, only tape-type disposable pad diapers for adults, particularly with an auxiliary pad, will be described, and napkins, etc. The application example to is omitted.

In the paper diaper shown in FIGS. 1 and 2, a liquid-permeable surface sheet 1 having a rectangular shape made of a nonwoven fabric or a porous film and a polyethylene or poly-laminated nonwoven fabric, forming microvoids to allow vapor to pass but liquid to pass. An absorbent body 3 made of cotton-like pulp or the like and having an appropriate shape such as a rectangle or an hourglass shape and having a certain degree of rigidity is interposed between the hourglass-shaped impermeable backsheet 2 and the impermeable backsheet 2. A high-molecular absorptive polymer can be added to the absorber 3. The absorbent body 3 can be covered with upper and lower tissue papers 3A and 3B for absorption to form an absorbent element.

The liquid-permeable top sheet 1 has a rectangular shape wider than the absorbent element 3, extends slightly outward from the side edge of the absorbent element 3, and is formed by a liquid-impermeable back sheet 2 and a hot melt adhesive or the like. It is fixed. Further, the liquid-permeable topsheet 1 is
It extends outward from the longitudinal edge of the absorbent element 3 and is fixed to the liquid-impermeable backsheet 2 with a hot melt adhesive or the like to form a waist flap F. In addition, * in the cross-sectional view indicates fixation by a hot melt adhesive or the like.

On both sides of the disposable diaper, as shown in FIG. 3, leg-barrier cuffs B are formed which project toward the use surface and stand upright. The barrier cuffs B are substantially continuous in the width direction. The barrier sheet 4, two elastic elastic members 5A, 5A for contact in an appropriate number of embodiments, and three elastic elastic members 5 for standing in an appropriate number of embodiments.
B, 5B, 5B. These elastic stretchable members can be made of, for example, thread rubber or strip rubber.

Also, as shown in FIGS. 2 and 4, a waist barrier cuff W is formed on the back side of the disposable diaper so as to project toward the use surface side and to stand upright. The barrier cuff W is formed by the barrier sheet 6. And, in an appropriate number of embodiments, two elastic elastic members for contact 7A, 7A, and in an appropriate number of embodiments, three elastic elastic members for standing 7B, 7B,
7B and. These elastic expansion / contraction members can also be made of, for example, thread rubber or strip rubber.
In the present embodiment, the barrier cuff W is formed only on the back side, but it can also be formed on the ventral side. The rectangular members 8 on both sides of the barrier cuff W are fastening tapes.

The barrier cuff W is formed in a double layer by folding the barrier sheet 6 inward, and the elastic cuffs 7A for contact,
7A and the elastic elastic members for standing 7B, 7B, 7B are wrapped in a state of being fixed by a hot melt adhesive or the like.
In the embodiment, the fold line constitutes the distal edge E1 and the product longitudinal outer edge E3. Both ends of the barrier sheet 6 in the longitudinal direction are provided with elastic elastic members 7B, 7B for standing up.
The barrier sheets 6 are formed in double in the vicinity of B and 7B (this overlapping is not shown).

The outer portion in the longitudinal direction of the inner layer of the double barrier sheet 6 is fixed to the end portion of the liquid permeable surface sheet 1 in the longitudinal direction of the product with a hot melt adhesive or the like. In the embodiment, the liquid-permeable topsheet 1 is extended outward from the longitudinal edge of the absorbent body 3 to form a waist flap F, and the waist flap F is fixed to the waist flap F. As a result, as shown in FIG. 5, the proximal edge E2 of the waist barrier cuff W is located on the waist flap F, and the inside of the proximal edge E2 is not fixed to the product body. The standing area Z stands upright. The length L of the standing region Z in the product longitudinal direction is preferably 10 mm, particularly 30 to 80 mm in the case of a disposable diaper.

The barrier cuff W is fixed so that the edge E3 of the barrier sheet 6 in the product longitudinal direction is more appropriate than the edge E7 of the waist flap F in the product longitudinal direction, and in the embodiment, 1 to 40 mm inward in the product longitudinal direction. It is made to be located in.

On the other hand, the widthwise end portion of the inner layer of the double barrier sheet 6 is, in the embodiment, the proximal edge of the barrier cuff B with respect to the use surface side of the product, as shown in FIG. E
It is fixed to the liquid-permeable surface sheet 1 by a hot-melt adhesive on the outer side in the width direction than 4. Note that, in FIG. 5, the portions where the barrier sheet 6 and the liquid-permeable surface sheet 1 are fixed by the hot-melt adhesive are indicated by HT by halftone dots.
Further, the widthwise end of the outer layer of the double barrier sheet 6 is provided with the elastic elastic member 5 for contact provided on the barrier cuff B.
Of the elastic elastic members for contact 7A, 7A provided on the barrier cuff W, the one that is outward in the longitudinal direction of the product is located outside the fixing line E5 where the one that is outward in the width direction of A and 5A is located. It is fixed to the barrier sheet 4 by a hot-melt adhesive outside the fixing line E6. In FIG. 5, the portion of the standing region Z of the barrier cuff W that is fixed to the barrier sheet 4 with the hot melt adhesive is shown as HB.

Under the above-mentioned relationship, the elastic elastic members 7A, 7A for contact are arranged near the standing distal edge E1 of the barrier cuff W and stand near the standing proximal edge E2 in the standing region Z of the barrier cuff W. Elastic stretchable members 7B, 7B, 7B are arranged. Therefore, the barrier cuff W is erected by the contracting force of each elastic expansion / contraction member 7A, ... And 7B. Moreover, since gathers are formed on the barrier cuff W by the elastic elastic members for standing 7B, 7B, 7B, it is possible to form no gathers on the waist flap F. If gathers are not formed on the waist flap F, the product does not expand and contract in the width direction, and the center of the product is easy to see. In other words, it is possible to prevent misalignment,
As a result, the function of the product can be fully exerted.

By the way, as shown in the upper part of FIG. 4, the waist barrier cuff W is pressed toward the product by the barrier cuff B at the widthwise side edge 4B portion (see FIG. 1). The standing height of the distal edge E1 is small. On the other hand, the 4A portion on the center side in the width direction (see FIG.
reference. In (), since there is no pressing by the barrier cuffs B, the barrier elastic cuffs 7B, 7B, 7B tend to raise the barrier cuffs W high. However, 4B
Since the rising height of the distal edge E1 of the barrier cuff W is small in the section, the distal edge E of the barrier cuff W in the section 4A is small.
As a result, the barrier cuff W stands up while inflating the middle portion in the height direction outward, as shown in the lower part of FIG. Thereby, the pocket of the barrier cuff W is formed, and the wrapping of the auxiliary pad 10 is also ensured. At the same time, the waist flap F is deformed and lifted up, and the absorber 3 is also lifted while deforming slightly, so that the pocket space becomes deeper.

Furthermore, in this lifted state, the strong contracting force of the elastic elastic members 7B, 7B, 7B for standing acts on the barrier cuff W itself, so that the barrier cuff W stands up almost vertically. At the same time, although the elastic elastic members 7A, 7A for contact are weak, the contracting force raises the barrier cuff W. However, the elastic contact elastic member 7
Even if the contracting force of A and 7A is weak, since the standing force of the barrier cuff W by the elastic elastic members 7B, 7B and 7B for standing is large, the standing of the barrier cuff W is surely secured as a whole. Since the contracting force of the elastic contact elastic members 7A, 7A is not strong, there is no excessive pressure contact with the wearer's skin.

In this way, since the rising of the barrier cuffs W is reliably ensured, as shown in FIG. 6, the auxiliary pad 1
Even if 0 is overlapped on the use surface side, the standing up of the barrier cuff W is ensured, the auxiliary cuff W does not lie down or warp, and the auxiliary pad 10 can be reliably wrapped.

By the way, as the material for the leg-surrounding barrier sheet 4 and the waist barrier sheet 6, a breathable and liquid-impermeable plastic film or a water-repellent non-woven fabric treated with silicon can be used. Further, as shown in FIG. 7 as an example in the case of the barrier cuff W, a waterproof sheet 7C made of a plastic film or the like is attached to a water repellent non-woven fabric or a non-water repellent non-woven fabric in order to surely prevent liquid permeation. It is good to intervene. As a preferable nonwoven fabric, a polypropylene nonwoven fabric manufactured by a melt blown method is more suitable. A sheet having a basis weight of 5 to 30 g / m ² is adhered in a bag-like form, and the bag-shaped edge is a free end. The elastic member may be a plurality of thread-shaped members made of natural rubber, synthetic rubber, polyurethane or the like, or a band-shaped member. In the embodiment, the strong contraction force of 7B, 7B, 7B is caused by the barrier cuff W.
Since it acts on itself, the barrier cuff W acts so as to stand almost vertically. As the elastic elastic member 7A for contact, two 560 denier urethane yarns are stretched by 200%,
Installed over 250 mm in the width direction of the product, the elastic elastic member 7B for standing up is made up of about 5 560 denier urethane threads.
250m in the product width direction with 200% elongation at mm intervals
It installed over m.

When mounted on a tape-type diaper, the expansion rates of the portions of the barrier cuff W on which the elastic elastic members 7A for contact are arranged and the portions on which the elastic elastic members 7B for standing are arranged are respectively up to 60%, preferably 40 to 40%. 50% In the embodiment, it is set to 50%. Also, the expansion / contraction rate is 2
The elongation stress at 0 to 90% is 0. The elastic stretchable member for standing 7B
Is O. When it is 10 to 1.50 N, the wearer does not feel a feeling of pressure and does not create a gap in the waist peripheral portion, and can exhibit excellent leakage prevention performance.

[0030]

As described above, according to the present invention, the effect of preventing leakage of the waist portion is high and the wearing feeling is excellent even when it is used alone or when the auxiliary pads are used in combination.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of a disposable diaper.

FIG. 2 is a view taken along the line 4A-4A.

FIG. 3 is a view taken along line 2-2.

FIG. 4 is a view taken along the lines 4A-4A and 4B-4B.

FIG. 5 is an enlarged view showing a fixed state of waist barrier cuffs.

FIG. 6 is a transverse cross-sectional view of a layout of auxiliary pads.

FIG. 7 is a cross-sectional view of another embodiment.

[Explanation of symbols]

1 ... Liquid-permeable front sheet, 2 ... Liquid-impermeable back sheet, 3 ...
Absorber, 4 ... Barrier sheet for leg circumference, 5A ... Elastic elastic member for contact, 5B ... Elastic elastic member for standing, 6 ... Barrier sheet for waist, 7A ... Elastic elastic member for contact, 7B
... elastic elastic member for standing up, 8 ... fastening tape, B ... barrier cuffs for leg circumference, E1 ... distal edge, E2 ... proximal edge, E3.
E7 ... longitudinal outer edge, E4 ... proximal edge, E5, E6 ...
Fixing line, F ... waist flap, HT, HB ... fixing part, W ... waist barrier cuff, Z ... standing area.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields investigated (Int.Cl. ⁷ , DB name) A61F 13/15-13/84

Claims (6)

(57) [Claims] 1. A disposable absorbent article having a waist barrier cuff that freely stands up in a use state on the use surface side of at least one product longitudinal direction end, wherein the barrier cuff is doubly formed by a barrier sheet. The base of the double-layered barrier sheet is fixed to the surface of use of the product, and the boundary between this fixed part and the unfixed standing area extending to the standing distal edge is the proximal edge of the waist barrier cuff. The longitudinal direction of the product between these double barrier sheets
Of the range, near the distal edge and near the proximal edge in the upright area
Disposable absorbent articles , each of which is provided with an elastic stretchable member . 2. The disposable absorbent article according to claim 1, wherein the standing region of the waist barrier cuff has a length in the product longitudinal direction of 10 mm or more. 3. The disposable absorbent article according to claim 1, wherein the elastic stretching member near the proximal edge has a larger stretching stress than the elastic stretching member near the distal edge. 4. A stress (width: 15 mm, length: 10) at a stretch ratio of 20 to 90% in a portion where an elastic expansion / contraction member is arranged near the distal edge.
(Per 0 mm) is 0.05 to 1.00 N, and the stress (width 15 mm, per 100 mm length) at the time of 20 to 90% elongation rate of the portion where the elastic stretchable member is arranged near the proximal edge is 0.10 to 0.10. The disposable absorbent article according to any one of claims 1 to 3, wherein the stress is 1.50 N, and the stress in the latter is larger than that in the former. 5. An outer edge in the product longitudinal direction of a fixed portion of a barrier cuff for waist is 1 to 40 from a longitudinal edge of the product.
The disposable absorbent article according to any one of claims 1 to 4, wherein the disposable absorbent article is set to be mm inside. 6. The disposable absorbent article according to any one of claims 1 to 5, wherein a waterproof sheet is sandwiched between double barrier sheets.