JPH10314221A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily secure a necessary length at disposal time so as not to become a hindrance at installing time by installing an auxiliary tape which is slender in the lengthwise direction and is used at diaper abandoning time, in a width directional central part of a back sheet of either one of a front body part and a rear body part of a disposable diaper. SOLUTION: In a disposable diaper where a freely extensible/contractible member is arranged along a waist surrounding opening part 1 and a pair of leg surrounding opening parts 2, a belt-like auxiliary tape 8 slender in the lengthwise direction is arranged in a width directional almost central part (an area which divide a width length into equal two parts and runs in the lengthwise directional center direction) of a back sheet 5 of either one of a front body part 3 and a rear body part 4. The auxiliary tape 8 is arranged so that its one end is fixed to the back sheet 5, and a locking part 11 capable of being installed on the back sheet 5 is formed on the opposite side one end, and is also formed of a raw material on which tensile force per unit width at 100% elongation time is 0.008 to 0.006 kgf/mm and initial strain at 100% elongation time is 20 to 95%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper for use as a diaper for infants or incontinent persons, and more particularly, to a compact contaminated three-dimensional pants-type disposable diaper after use. The present invention relates to a disposable diaper having an auxiliary tape which has a clean and sanitary disposal treatment means and does not become a hindrance when worn.

[0002]

2. Description of the Related Art Conventionally, as a disposal method of sanitary goods, a brief-type wearing article provided with an adhesive application section at a free end of a joint portion on a waist side and containing excrement has been proposed (actually). JP-A-4-117618). This is a tab extended to the waist side, but it is necessary to increase the width of the brief material in order to attach the tab, so it becomes expensive, and furthermore, there is a problem that the bonding area cannot be substantially widened, It was not always enough. Further, it has been proposed to use a stretchable elastic material for a tape used at the time of disposal. However, when the tape is stretched and fixed to the backsheet after the diaper is rolled, the tape shrinks and the backsheet in the area where the tape is fixed sometimes breaks or the adhesive part of the tape peels off from the backsheet. In some cases, the tape came off, hindering disposal.

In Japanese Utility Model Publication No. 8-10305,
There is disclosed a pants-type diaper in which one end of a strip-shaped tape fastener for fastening at the time of disposal is fixed, folded in the length direction thereof, and arranged so as to be located in the back side. The tape fastener needs to be longer than the opening edge of the waist of the pants-type diaper, so that it is folded so as not to be in the way during mounting. For this reason, in addition to the purpose of fastening, an adhesive is required to keep the tape fastener in a folded state. Moreover, the tape fastener folded when the pants or the like are put on the diaper is easily peeled off, which is inconvenient.

[0004]

DISCLOSURE OF THE INVENTION The present invention overcomes the above-mentioned conventional problems of a pants-type disposable diaper to which a tape used at the time of disposal is attached, does not become a hindrance at the time of wearing, and a disposal process. An object of the present invention is to provide a pants-type disposable diaper to which an auxiliary tape which can sometimes easily secure a required length is attached.

[0005]

Means for Solving the Problems The present invention comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between these two sheets, and a front body and a back body The opposite side edges are joined to form a waist opening and a pair of leg openings, and a stretchable elastic member is arranged along the waist opening and the pair of leg openings. In the diaper, a strip-shaped auxiliary in the longitudinal direction is provided at a substantially central portion in the width direction of the back sheet of one of the front body and the back body (a region along a longitudinal center line that divides the length in the width direction into two equal parts). A tape is disposed, the auxiliary tape is disposed with one end fixed to the back sheet, and a locking portion attachable to the back sheet is formed at the opposite end, and the unit is at the time of 100% extension. The tensile force per width is 0.00 ~0.006kgf / mm, 1
A disposable diaper characterized by being formed of a material having an initial strain of 20 to 95% when stretched by 00%.

The tensile force per unit width at 100% elongation and the initial strain at 100% elongation are measured in the following manner. (1) Tensile force per unit width at 100% elongation This is the maximum load per unit width required to pull the auxiliary tape to 100% elongation (kgf / m).
m). Using a tensile tester, a sample of the material of the auxiliary tape is pulled to a length twice as long as the original length at a pulling speed of 500 mm / min, and the maximum load during this is measured. The maximum load is the tensile force at 100% elongation, and the value obtained by dividing the maximum load by the width of the sample is the tensile force per unit width at 100% elongation. At this time, the width of the sample is preferably 25 mm, but there is no particular limitation when this size cannot be secured.

(2) Initial strain at 100% elongation This is the rate of plastic deformation that occurs immediately after the auxiliary tape is pulled to 100% elongation and then loosened.
Using a tensile tester, a sample of the material of the auxiliary tape
At a pulling speed of 500 mm / min, the wire is pulled to a length twice as long as the original length, then loosened, and the length is measured again within 5 minutes from the end of the pulling operation, and the original length (the original span length) ) Is determined by the following equation. As in the case of the tensile force, the width of the sample is preferably 25 mm, but there is no particular limitation in the case where this size cannot be secured. L = (L2−L1) / L1 × 100 L: initial strain at 100% elongation (%) L1: original sample length (original span length) L2: sample length when pulled and then loosened Sa

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A disposable diaper according to the present invention is provided with an auxiliary tape used for disposal of a diaper which is elongated in a longitudinal direction, at a central portion in a width direction of one of a front body and a back body. Things. In this case, the auxiliary tape has a tensile force per unit width at the time of 100% elongation of 0.008.
~ 0.06kgf / mm, initial strain 20 ~ 95%
Is formed of a material having a value in the range of By using such an auxiliary tape, a small-diameter object can be attached to the diaper, so that it does not become a hindrance at the time of attachment, and the necessary length can be easily secured at the time of disposal processing. By doing so, it is easy to be plastically deformed and the contraction force is weak, so once it is attached to the backsheet, it does not come off, and the used diaper can be kept compact and sanitarily disposed.

The top sheet used in the present invention is a liquid-permeable nonwoven fabric or woven fabric made of synthetic fibers using polyester, polypropylene, polyester, other thermoplastic resin, or the like as a raw material. Natural fibers may be used, and the fibers can be manufactured from a wide range of materials such as a combination of synthetic fibers and natural fibers. In any case, since the top sheet is a part that comes into direct contact with the skin, the top sheet may be soft and comfortable, and may be breathable. Since the center region in the width direction of the top sheet is disposed on the absorber, it is preferable that the top sheet be a hydrophilic fiber so that the liquid can be transmitted quickly. In addition, the width direction both side edge regions of the top sheet, from the absorber that has absorbed the liquid,
It is preferably water repellent so as not to seep out. Further, the top sheet does not need to be constituted by a single sheet, and may be constituted by a plurality of sheets such as a center top sheet and a side top sheet. When the top sheet is composed of a plurality of sheets, each sheet may be made of a different material, or may be made of the same material.

The back sheet used in the present invention is a liquid-impermeable film such as polyethylene, a material in which a non-woven fabric or a woven fabric is bonded to the liquid-impermeable film,
Further, it is made of a nonwoven fabric or a woven fabric having a leakproof property, and is not particularly limited as long as the moisture in the absorbent does not seep out to the outside of the diaper. Further, it may be embossed in a pattern to give a cloth-like appearance, or may be further matte-finished. When a film is used, a known moisture-permeable film that is permeable to water vapor only while being impermeable may be used, and is preferable because it prevents stuffiness. Further, the material may be elastic so as to fit the wearer. Polyurethane film,
Use of a natural rubber sheet, a foamed sheet, or the like is conceivable, and a material in which an elastic nonwoven fabric or the like is attached may be used.

The absorbent used in the present invention is formed of cotton-like pulp, a superabsorbent polymer, a hydrophilic sheet or the like, and is not particularly limited as long as it has a water absorbing property. The absorbent used in the present invention is made from known absorbent materials commonly used in conventional disposable diapers and other absorbent articles. That is, it is formed from a single-layer or multi-layer mat made of absorbent fibers such as cotton-like pulp and rayon, wrapped by a hydrophilic sheet, and a highly water-absorbing polymer is uniformly mixed in each mat. Alternatively, they are arranged in layers between the mats. In addition, the absorbent in which the superabsorbent polymer is uniformly mixed may be heat-compressed after mixing 3 to 60% by weight of the heat-fusible substance with respect to the cotton-like pulp. Only the water-absorbing polymer substance may be wrapped by the hydrophilic sheet.

As the cotton-like pulp, chemical pulp sheet,
It has a fiber length of 5 mm or less obtained by defibrating a waste paper pulp sheet or a mechanical pulp sheet with a crusher.
Pulp materials are not limited to conifers, but include hardwoods, straws,
Bamboo and kenaf also apply. The amount of the pulp, the absorbent body of interest, for example, whether used alone, or used by stacking a plurality, varying the like or in combination with other absorbent material, typically, 50 to 400 g / m ² To be.

Examples of the superabsorbent polymer include starch, cellulose and synthetic polymer. That is, a starch-acrylic acid (salt) graft polymer, a saponified starch-ethyl acrylate graft copolymer, a saponified starch-methyl methacrylate graft copolymer, a saponified starch-acrylonitrile graft copolymer, Saponified starch-acrylamide graft copolymer, saponified starch-acrylonitrile-2-acrylamido-2-methylpropanesulfonic acid graft copolymer, acrylic acid (salt) polymer, polyethylene oxide cross-linked with acrylic acid, A crosslinked product of sodium carboxymethylcellulose; a crosslinked product of a polyvinyl alcohol-maleic anhydride reactant;

Among these superabsorbent polymers, those which absorb urine, bodily fluid and water at least 20 times their own weight, and sodium polyacrylate are most suitable from the viewpoint of absorption performance. The distribution amount of the superabsorbent polymer material is 10 to 500 parts by weight with respect to 100 parts by weight of the dried floc pulp,
It is preferably 15 to 300 parts by weight, and such an amount of the superabsorbent polymer is substantially uniformly distributed in the cotton-like pulp. When the superabsorbent polymer material absorbs water and swells, the particles have minimal interference with each other, continuously contact and have a small permeation barrier, and permeate and absorb urine and body fluid in three-dimensional directions.

The shape of the absorber may be an hourglass, a rectangle, a T
There is no particular limitation on the character shape, etc., as long as the shape fits the inseam. In general, in order to improve the feeling of wearing, it is particularly preferable to have a shape in which the crotch portion is narrowed, such as an hourglass shape or a T shape.

The stretchable elastic member is disposed in an extended state at the opening around the leg, around the waist, and the like, and is adhered and fixed with a hot melt adhesive. As the elastic member, a urethane film, urethane thread, urethane foam, thread rubber or the like is used.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a pants-type disposable diaper to which the auxiliary tape of the present invention is attached. FIG. 2 is a cross-sectional view of the auxiliary tape in FIG. 1 taken along line xx ′. FIG. 3 is a cross-sectional view showing another example different from FIG. 2 when the auxiliary tape in FIG. 1 is cut along the line xx ′. FIG. 4 is a cross-sectional view showing another example different from FIGS. 2 and 3 when the auxiliary tape in FIG. 1 is cut along the line xx ′. FIG. 5 is a cross-sectional view showing another example different from FIGS. 2, 3 and 4 when the auxiliary tape in FIG. 1 is cut along the line xx ′. FIG. 6 is a perspective view showing a state in which the disposable diaper developed after use is partially rounded. FIG. 7 is a perspective view showing a state where the auxiliary tape of the present invention is peeled off. FIG.
It is a perspective view showing the state where the auxiliary tape of the present invention was fixed to the back sheet of the rolled diaper.

Reference numeral 1 denotes an opening around the waist, 2 denotes an opening around the leg, 3 denotes a front body, 4 denotes a back body, 5 denotes a back sheet, 6 denotes a side seam, 7 denotes a top sheet, 8 denotes an auxiliary tape, 9 is a fixed part, 10 is a separation part, 11 is a locking part, 1
Reference numeral 2 denotes a knob, reference numeral 13 denotes a tape subjected to a peeling process, and reference numeral 14 denotes a second auxiliary tape.

As shown in FIG. 1, the pants-type disposable diaper according to the present invention has a front seam 3 and a back body 4 whose opposite side edges are adhesively closed by side seams 6 and a pair of openings 1 around the waist. The opening around the leg 2 is formed, and an elastic body is attached to each opening, and furthermore, an elongated band along the longitudinal direction is formed at the center in the width direction of the back sheet 5 of the front body 3. Are provided. As shown in FIGS. 2 to 5, the auxiliary tape 8 is formed on a fixing portion 9 having one end fixed to the back sheet 5, a separation portion 10 not fixed, and at least a part of the separation portion 10. It comprises a locking portion 11 and a knob portion 12 formed at an end of the separating portion 10.

The material of the auxiliary tape 8 may be in the form of a film or a non-woven fabric. Polyolefin resins such as polypropylene, polyethylene and polystyrene, polyester resins such as polyethylene terephthalate, polybutylene terephthalate and copolymers thereof, nylon 6, nylon 66, etc. And a biodegradable resin such as a polyamide resin, a polyvinyl alcohol resin, a polyacrylonitrile resin, polylactic acid, and a fatty acid polyester.

The auxiliary tape 8 is assumed to be used after being stretched to about 100% elongation, and has a tensile force per unit width at the time of 100% elongation of 0.008 to 0.06 kgf / mm.
And the initial strain at 100% elongation is 20-95.
% Of an extensible material.

When the tensile force per unit width of the auxiliary tape 8 at 100% elongation exceeds 0.06 kgf / mm, the fixing portion 9 peels off from the back sheet 5 or the back sheet adhered to the fixing portion 9 Problems such as tearing occur. Further, since the width of the auxiliary tape 8 cannot be made extremely small, a large force is required to extend the auxiliary tape 8, which is inconvenient to handle. Conversely, if the tensile force per unit width is less than 0.008 kgf / mm,
Since the tensile strength of the auxiliary tape 8 is relatively reduced and the auxiliary tape 8 is stretched by a small force, the used diaper cannot be held in a rolled state.

The width of the auxiliary tape 8 is preferably 1 to 4 cm. When the width of the auxiliary tape 8 is less than 1 cm,
The auxiliary tape 8 is too thin, which is inconvenient to handle, and furthermore, becomes thinner when extended, so that the auxiliary tape 8 is easily broken, which is not preferable. On the other hand, if it exceeds 4 cm, the width of the auxiliary tape 8 becomes too large, and it is not preferable.

The force required to stretch the auxiliary tape 8 (the tensile force when the auxiliary tape 8 is stretched by 100%) is 0.0
It is preferably from 8 to 2.4 kgf. 0.08kg
If it is less than f, the auxiliary tape 8 will be stretched even with a slight force, and the holding force will be insufficient. Even if the used diaper that has been rounded is fixed with the auxiliary tape 8, the tape will be stretched and the diaper will spread. On the other hand, if it exceeds 2.4 kgf, a large force is required to stretch the auxiliary tape 8, which is inconvenient to handle, and causes a problem that the fixing portion 9 is peeled off from the back sheet 5.

The initial strain at 100% elongation is 20%.
%, The auxiliary tape 8 has a property close to an elastic body, has a large contraction force in the most extended state, and the back sheet 5 adhered to the fixing portion 9 is broken.
The auxiliary tape 8 is easily detached from the back sheet, and the used diaper cannot be maintained in a rolled state, resulting in sanitary disposal. Can not.
Conversely, if it exceeds 95%, the auxiliary tape 8 has a large amount of plastic deformation, and the contraction force in the most stretched state tends to be considerably smaller than the maximum contraction force (maximum tensile force). The diaper spreads without being able to withstand the slight force of spreading.

The basis weight of the auxiliary tape 8 is 8 to 150 g / m ^2.
And more preferably 10 to 50 g / m ² . When the basis weight is less than 8 g / m ² , not only the strength is weak but also there is no stiffness, and handling of the auxiliary tape 8 is inconvenient. On the other hand, when the basis weight exceeds 150 g / m ² , the auxiliary tape 8 becomes hard, and the fit is inferior when the diaper is attached.

A method of fixing the fixing portion 9 of the auxiliary tape 8 to the back sheet 5 is generally a method using an adhesive such as acrylic or styrene.
Is preferably 1 cm to 8 cm. 1c
If it is less than m, it is difficult to securely fix the auxiliary tape 8 to the backsheet 5 of the diaper. On the other hand, if it exceeds 8 cm, it is undesired because it interferes with mounting.

The length of the separation portion 10 of the auxiliary tape 8, that is, the length other than the fixing portion 9, is preferably 1.5 to 7 cm. If the length is less than 1.5 cm, the auxiliary tape 8 is too short, and it is difficult to fix the auxiliary tape 8 to the back sheet 5 with the locking portion 11 of the auxiliary tape 8 even if it is extended. In addition, if it is forcibly extended, the auxiliary tape 8 is broken. On the other hand, if it exceeds 7 cm, it is undesired because it interferes with mounting.

The auxiliary tape 8 has a locking portion 11 at a separation portion 10 opposite to the fixing portion 9. The material of the locking portion 11 is not particularly limited, but may be a known adhesive or a hook-and-loop fastener, for example, as long as it can be fixed without peeling off from the back sheet 5. Further, the locking portion 11 may be formed on at least a part of the separation portion 10 on the side opposite to the fixing portion 9 of the auxiliary tape 8, and as shown in FIGS. They may be formed, or a plurality of them may be formed discontinuously as shown in FIG.

When the locking portion 11 is formed of an adhesive,
As shown in FIG. 4, the tape 13 that has been subjected to the surface release treatment may be fixed to the back sheet 5 in advance. Thus, the auxiliary tape 8 can be attached and detached any number of times without being adhered to the back sheet 5 before disposal. 2 or 3, the same effect can be obtained even if the surface of the fixing portion 9 of the auxiliary tape 8 opposite to the surface fixed to the back sheet 5 is subjected to a peeling treatment. Further, as shown in FIG. 5, another tape 14 may be attached to the end of the separating portion 10 made of an extensible tape, and the locking portion 11 may be formed at this portion. In this case, it is preferable that the tape 14 forming the locking portion is non-extensible.

Further, a knob 12 is formed at an end of the engaging portion 11 in order to easily peel off the auxiliary tape 8. As shown in FIG.
1 may be formed by folding back, and as shown in FIG. 3, a tape different from the auxiliary tape 8 may be attached to the end of the locking portion, or as shown in FIG. As described above, a region where the locking portion is not formed may be provided at the end of the separation portion 10 to serve as the knob portion 12.

The mounting position of the auxiliary tape 8 is
It is preferable that one of the back sheets 5 of the back body 4 and the back body 5 is attached to the center in the width direction so as to be elongated in the longitudinal direction. Thus, the auxiliary tape 8 can be attached to the back sheet 5 beyond the waist opening 1 of the rolled used diaper.

The auxiliary tape 8 is used when the used diaper is discarded.
6, the front body 3 and the back body 4 are separated to form a flat shape, and FIG.
As shown in FIG. 7, the front body 3 is gradually rounded from the end, and the tape is peeled off as shown in FIG. 7, and then the separation portion 10 is extended. As shown in FIG. By bonding and fixing to the back sheet 5, the diaper can be easily and sanitarily used and the diaper can be discarded.

Since the auxiliary tape 8 in the disposable diaper of the present invention is attached to the diaper main body with a small area at the time of mounting, it has almost no effect on the fit. Since the auxiliary tape 8 has extensibility, the auxiliary tape 8 can be stretched to a sufficient length and fixed to the back sheet 5 at the time of disposal, and the used diaper is kept in a rolled state. In addition, since the auxiliary tape 8 is likely to be plastically deformed by stretching and has a weak contraction force, the auxiliary tape 8 does not come off while maintaining a sufficient length after the auxiliary tape 8 and the back sheet 5 are fixed. Further, not only can the auxiliary tape 8 be supplied at a relatively low cost, but also the area of the required material is smaller than that of the conventional tape, so that it is possible to manufacture at a low cost. By attaching such an auxiliary tape 8 to a three-dimensional pants type, a used diaper can be compactly and sanitarily disposed.

[0035]

EXAMPLES The diaper according to the present invention will now be described more specifically with reference to examples, but the present invention is not limited to these examples. In addition, the measuring method of each sample and the evaluation method of the performance when it is used as an auxiliary tape are as follows.

Measuring method (1) Tensile force per unit width at 100% elongation, and two samples of the raw material of the tensile strength auxiliary tape over the entire width of the auxiliary tape
Cut to a length of 100mm or more with a width of 5mm, span 4
Under a condition of 0 mm and a tensile speed of 500 mm / min, a tensile tester (Strograph V1-, manufactured by Toyo Seiki Seisaku-sho, Ltd.)
In B), the sample piece is pulled to 100% elongation, the maximum load (kgf) is measured, and the tensile force per unit width (kgf / mm) = maximum load (kg)
f) / 25 (mm). In addition, in the full width of the auxiliary tape, 1
The tensile force at 00% elongation was determined as follows. Tensile force (kgf) = Tensile force per unit width (kgf / mm) ×
Auxiliary tape width (mm)

(2) Initial strain at 100% elongation A sample of the auxiliary tape material was 100 mm in width of 25 mm.
Cut to the above length and stretched 100% with a tensile tester (Strograph V1-B, manufactured by Toyo Seiki Seisaku-sho, Ltd.) under the conditions of a span of 40 mm and a tensile speed of 500 mm / min.
As in the case where the tensile force per unit width during elongation was measured, the sample piece was pulled to 100% elongation, then loosened, and the ratio of plastic deformation to the original span length of 40 mm was determined by the following equation. L = (L2−L1) / L1 × 100 L: Initial strain at 100% elongation (%) L1: Original sample length (span length: 40 mm) L2: Sample length when pulled and then loosened (Mm)

Evaluation method (1) Attaching test of auxiliary tape After absorbing water (250 cc) into a three-dimensional pants type diaper, the front body and the back body were separated by a side seam to make a flat shape, and gradually from the end of the front body. Then, the auxiliary tape attached to the rear body was peeled off, the separated portion was extended, and fixed to the backsheet of the front body beyond the opening around the waist, and the auxiliary tape was attached so as to be in the state shown in FIG. The ease of handling at that time was evaluated organoleptically in three stages. ○: Easy to install △: Somewhat difficult to install ×: Hard to install

(2) Diaper Disposal Holding Test After the auxiliary tape attachment test, whether the diaper can be held in a rolled state is evaluated in three stages. ○: The diaper is held in a curled state △: The diaper is slightly spread ×: The diaper is spread

Example 1 Low-density polyethylene film A having a tensile force of 0.04 kgf / mm per unit width at 100% elongation and a thickness of 0.04 mm having an initial strain of 63%
(Length: 100 mm, width: 20 mm), folded back into two as shown in FIG. 2, the upper part as the separated part, the lower part as the fixed part,
The fixing part was attached to the widthwise center of the back of the diaper using a three-dimensional pants-type diaper and attached in a slender manner in the longitudinal direction. At this time, the tensile force at 100% elongation in the entire width of the auxiliary tape is 0.8.
kgf. In addition, the adhesive portion of the auxiliary tape was coated with an acrylic adhesive at intervals of 5 mm along the horizontal streak line having a length of 5 mm over the entire separation portion. Further, the tip of the locking portion was turned back to form a knob. Note that the fixing portion is subjected to a peeling treatment on a surface opposite to a surface attached to the diaper. The performance was evaluated using a three-dimensional pants-type disposable diaper to which an auxiliary tape was attached.

Example 2 Tensile force per unit width at the time of 100% elongation: 0.056 kgf / mm, initial strain: 50
% Of low-density polyethylene film B having a thickness of 0.06 mm (length 100 mm, width 40 mm).
An auxiliary tape was prepared in the same manner as described above, and attached to a three-dimensional pants-type disposable diaper to evaluate its performance. At this time, the tensile force at the time of 100% elongation in the entire width of the auxiliary tape is 2.2.
It is 4 kgf. Example 3 A composite sheet (a urethane film having a thickness of 0.015 mm and a spunlace having a basis weight of 26 g / m ^{2) having} a tensile force per unit width of 0.02 kgf / mm and an initial strain of 22% at 100% elongation. An auxiliary tape was prepared in the same manner as in Example 1 using a sheet in which a nonwoven fabric was laminated with a hot melt, length 100 mm, width 20 mm), attached to a three-dimensional pants type diaper, and evaluated for performance. At this time, the tensile force at the time of 100% elongation over the entire width of the auxiliary tape is 0.4 kgf.

Example 4 Tensile force per unit width at 100% elongation 0.034 kgf / mm, initial strain 94
%, A low-density polyethylene film C having a thickness of 0.015 mm (length: 100 mm, width: 20 mm) was used to prepare an auxiliary tape in the same manner as in Example 1 and attached to a three-dimensional pants-type padded diaper to improve performance. evaluated. At this time, the tensile force at 100% elongation in the entire width of the auxiliary tape is 0.
It is 68 kgf. Example 5 Spunlace nonwoven fabric (100 mm in length, made of polyethylene / polyester fiber having a basis weight of 45 g / m ² and a tensile force of 0.01 kgf / mm per unit width at an elongation of 100% and an initial strain of 88% having a basis weight of 88%) An auxiliary tape was prepared in the same manner as in Example 1 and attached to a three-dimensional pants-type disposable diaper, and the performance was evaluated.
At this time, the tensile force at the time of 100% elongation over the entire width of the auxiliary tape is 0.1 kgf.

Comparative Example 1 Tensile force per unit width at 100% elongation 0.007 kgf / mm, initial strain 90
% Spunlaced non-woven fabric with a basis weight of 26 g / m ² polyethylene / polyester fiber (length 100 mm, width 10 m
m), an auxiliary tape was prepared in the same manner as in Example 1, attached to a three-dimensional pants-type disposable diaper, and the performance was evaluated. At this time, the tensile force at the time of 100% elongation over the entire width of the auxiliary tape is 0.07 kgf. [Comparative Example 2] A high-density polyethylene film (length 100 mm, width 40 mm) having a tensile force of 0.064 kgf / mm per unit width at 100% elongation and an initial strain of 50% and a thickness of 0.015 mm was used. An auxiliary tape was prepared in the same manner as in Example 1, attached to a three-dimensional pants type diaper, and evaluated for performance. At this time, the tensile force at 100% elongation over the entire width of the auxiliary tape is 2.56 kgf.

Comparative Example 3 Tensile force per unit width at 100% elongation 0.06 kgf / mm, initial strain 18%
0.06 mm thick urethane film (length 100
mm, width 20 mm), an auxiliary tape was prepared in the same manner as in Example 1, attached to a three-dimensional pants-type disposable diaper, and the performance was evaluated. At this time, the tensile force at 100% elongation over the entire width of the auxiliary tape is 1.20 kgf. [Comparative Example 4] Tensile force per unit width at 100% elongation
008 kgf / mm, basis weight 2 with initial strain of 98%
A spunlace non-woven fabric (length: 100 mm, width: 10 mm) made of polyethylene / polyester fiber of 6 g / m ² was used to prepare an auxiliary tape in the same manner as in Example 1, and attached to a three-dimensional pants-type diaper. evaluated. At this time, the tensile force at the time of 100% elongation over the entire width of the auxiliary tape is 0.08 kgf.

[Comparative Example 5] A polyester terephthalate film having a thickness of 0.025 mm (length: 100 m) was cut before reaching 100% elongation (tensile elongation: 75%)
m, width 20 mm), an auxiliary tape similar to that of Example 1 was prepared, attached to a three-dimensional pants-type disposable diaper, and evaluated for performance. Table 1 shows the results obtained in Examples 1 to 5 and Comparative Examples 1 to 5.

[0046]

[Table 1]

As can be seen from Table 1, the auxiliary tape obtained according to the present invention is easy to handle and can be held in a state in which the diaper is curled. In contrast, 100%
When the tensile force per unit width at the time of stretching is too weak (Comparative Example 1), the auxiliary tape is stretched by a small force, which is convenient for handling. The auxiliary tape is easily stretched by a slight force from the diaper, and the diaper cannot be kept in a curled state.
Conversely, when the tensile force per unit width is too strong (Comparative Example 2)
However, a strong force is required to stretch the auxiliary tape, which is inconvenient to handle, and furthermore, the fixing portion is peeled off.

When the initial strain at the time of 100% elongation is small (Comparative Example 3), even when the auxiliary tape is handled well, the auxiliary tape is not easily plastically deformed, so that the contraction force is large and the locking portion is formed. It easily comes off the backsheet. When the elongation does not reach 100% elongation (Comparative Example 5), the handling of the auxiliary tape is inconvenient, and more material is required than the auxiliary tape of the present invention, resulting in an increase in cost. 10
When the initial strain at 0% elongation is large (Comparative Example 4),
When the tape is stretched and used, the plastic deformation is large and the maximum tensile force is in the appropriate range, but the contraction force in the most stretched state is much smaller than the maximum tensile force, and the holding force is insufficient. is there.

[0049]

The auxiliary tape in the disposable diaper of the present invention can be attached to the diaper main body with a small area at the time of mounting, and thus has little effect on the fit. Since the auxiliary tape has extensibility, the auxiliary tape can be stretched to a sufficient length and then fixed to the back sheet, and the used diaper can be kept in a rolled state. Further, since the auxiliary tape is likely to be plastically deformed by being stretched and has relatively weak contraction force after being stretched, it does not peel off while maintaining a sufficient length after fixing the auxiliary tape and the backsheet. Further, not only can the auxiliary tape be supplied at a relatively low cost, but also the area of the necessary material is smaller than that of the conventional tape, so that it can be manufactured at a low cost. By attaching such an auxiliary tape to the three-dimensional pants type, the used diaper can be compactly and sanitarily disposed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disposable diaper of the present invention with an auxiliary tape attached.

FIG. 2 is a cross-sectional view of the auxiliary tape in FIG. 1 taken along line xx ′.

FIG. 3 is a sectional view showing another example different from FIG. 2, in which the auxiliary tape in FIG. 1 is cut along a line xx ′;

FIG. 4 is a cross-sectional view showing another example different from FIGS. 2 and 3 in which the auxiliary tape in FIG. 1 is cut along line xx ′.

FIG. 5 is a cross-sectional view showing another example different from FIGS. 2, 3 and 4 in which the auxiliary tape in FIG. 1 is cut along line xx ′.

FIG. 6 is a perspective view showing a state in which the disposable diaper developed after use is partially rounded.

FIG. 7 is a perspective view showing a state in which the auxiliary tape of the present invention is peeled off.

FIG. 8 is a perspective view showing a state in which the auxiliary tape of the present invention is fixed to a back sheet of a rolled diaper.

[Explanation of symbols]

 1. Opening around waist 2. Opening around the leg 3. Front body 4. Back body 5. Back sheet 6. Side seam 7. Top sheet 8. Auxiliary tape 9. Fixing part 10. Separation part 11. Locking part 12. Knob 13. 13. Tape subjected to peeling treatment 2nd auxiliary tape

Claims (1)

[Claims] 1. A liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between these two sheets, and joining opposite side edges of a front body and a back body. A waist opening and a pair of leg openings, and a stretchable elastic member disposed along the waist opening and the pair of leg openings. At a substantially central portion in the width direction of one of the back sheets of the body, an elongated strip-shaped auxiliary tape is disposed in the longitudinal direction, and the auxiliary tape has one end fixed to the back sheet and disposed, and the other end on the opposite side. Has a locking portion that can be attached to the back sheet, and has a tensile force per unit width of 0.008 at 100% elongation.
0.06 kgf / mm, and the initial strain at this time is 2
A disposable diaper characterized by being formed from a material that is 0 to 95%.