Disposable wearing article

The present invention relates to a disposable wearable article, and more particularly to a disposable wearable article to which a fastening tape is attached, which is suitable for use as a diaper or the like.

U.S. Pat. No. 4,237,890 (Patent Document 1) discloses a piece of tape that is stretchably folded into an S-shape or Z-shape as a fastening means used for disposable diapers. The first end of the tape piece is fixed to the outer surface of the diaper via a first pressure-sensitive adhesive, and the tape piece is extended by pulling the second end, which is the opposite end of the first end. A second pressure-sensitive adhesive is applied to the inner surface of the second end.

U.S. Pat. No. 5,182,156 (Patent Document 2) also discloses a fastening tape composed of Z-shaped folded tape pieces. This fastening tape is used in the same manner as the fastening tape disclosed in Patent Document 1.

Japanese Unexamined Patent Publication No. 2-4372 (Patent Document 3) discloses a disposable absorbent product having a fastener system. A Y-shaped piece of tape is used in the fastener system.<patcit num="1"><text>U.S. Pat. No. 4,237,890</text></patcit><patcit num="2"><text>U.S. Pat. No. 5,182,156</text></patcit><patcit num="3"><text>Japanese Unexamined Patent Publication No. 2-4372</text></patcit>

<p> When the tape piece folded in the Z shape disclosed in Patent Documents 1 and 2 is pulled and extended, a peeling force acts between the tape piece and the outer surface of the diaper, and the tape piece can be easily peeled off from the outer surface. It may end up. In order to prevent the peeling, it is effective to strengthen the adhesive force of the pressure-sensitive adhesive. However, if a piece of tape with such adhesive strength is attached to an outer surface formed of a non-woven fabric, then when the piece of tape is pulled, the structure of the non-woven fabric, in other words the fibers forming the non-woven fabric, The disentanglement can cause the piece of tape to fall off the diaper along with its fibers.</p><p> The Y-shaped tape piece used in Patent Document 3 is fixed to the outer surface and the inner surface of the diaper via a pressure-sensitive adhesive applied to the tape piece, so that when it is pulled, it can be removed from the diaper. It's not easy to drop out. However, this piece of tape generally does not stretch as long as a piece of tape that is folded into a Z shape, depending on its design.</p><p> Therefore, an object of the present invention is the use of a fastening tape that is folded into a Z-shape or an inverted Z-shape and attached to the outer surface of a disposable worn article whose outer surface is made of a non-woven fabric. The purpose is to make improvements so that the item will not fall off from the worn item when it is pulled by hitting the item.</p>

Means for Solving Problems and Effects of Invention

In order to solve the above problems, the present invention has an inseam region, a front waist circumference region located in front of the inseam region, and a rear waist circumference region located behind the inseam region. Each of these regions has an inner / outer surface and a pair of side edges extending in parallel in the front-rear direction of the inseam region, and the front-rear waist circumference region further intersects the side edge portion in the width direction of the inseam region. It has an edge portion extending to, and extends in either a Z-shape or an inverted Z-shape on the outer surface of any of the front and rear waist circumference areas in the vicinity of the side edge portion and the edge portion. It is a disposable wearable article to which a fastening tape including a foldable tape piece and a fastening means provided on the tape piece is attached.

The features of the present invention in such worn articles are as follows. The outer surface sheet includes an inner surface sheet forming an inner surface of the front-rear waist circumference region and an outer surface sheet forming an outer surface, and the outer surface sheet includes a first outer surface sheet formed of a non-woven fabric made of a thermoplastic synthetic fiber and the first outer surface. The tape piece of the fastening tape includes a second outer surface sheet which is bonded to the inside of the sheet and is formed of a film made of a thermoplastic synthetic resin, and the tape piece of the fastening tape is bonded to the first outer surface sheet via an adhesive. The entire surface facing the first outer surface sheet is attached via the adhesive, and the first outer surface sheet is attached to the first outer surface sheet.<u style="single">It is located at one of both ends in the direction in which the tape piece extends, and is located at a film-like joint portion where a plurality of synthetic fibers are welded together to be integrated, and at the other end of the synthetic fiber. A plurality of strips are welded to each other to have a film-like portion that is integrated, and the tape piece is non-peelablely joined at the joint portion and the film-like portion.</u>。

The fastening tape of the disposable worn article thus constructed has the tape piece bonded to the part of the non-woven fabric forming the outer surface of the worn article which has changed into a film shape via an adhesive. Even if the adhesive has a strong adhesive force, when the fastening tape is pulled, the structure of the non-woven fabric is not destroyed and the fastening tape does not fall off from the worn article.<u style="single">Further, the tape piece can be prevented from falling off from the worn article of the fastening tape by joining both end portions at the portion facing the non-woven fabric to the film-like outer surface.</u>

In one of the embodiments of the present invention, the nonwoven fabric has a basis weight of 10 to 50 g / m.²belongs to. According to the present invention, even if the outer surface of the worn article is formed of the non-woven fabric having such a small basis weight, it is possible to prevent the structure of the non-woven fabric from being destroyed and the fastening tape from falling off from the worn article. ..

In another one of the embodiments of the present invention, the worn article is of a pants type, and the side edges of the front and rear waist circumferences overlap each other and are welded to each other. The synthetic fiber in<u style="single">Joint site</u>Form and<u style="single">The joint site</u>The tape piece is joined to. In the worn article of this aspect, since the fastening tape is attached using the film-like outer surface formed by the non-woven fabric when the side edges of the front and rear waist circumferences are joined to each other, the purpose is only to attach the fastening tape. It is not necessary to form a film-like outer surface of the non-woven fabric.

The details of the disposable wearable article according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partially broken perspective view of a disposable pants-type diaper 1 which is an example of a disposable worn item. The diaper 1 is interposed between the inner sheet 20 forming the inner surface facing the skin of the diaper wearer, the outer sheet 30 forming the outer surface facing the diaper wearer's clothes, and both of these sheets 20, 30. It has a liquid absorbing core 40 and a diaper. The inner surface sheet 20 is a liquid permeable material, is formed of a non-woven fabric made of a thermoplastic synthetic fiber or a perforated film made of a thermoplastic synthetic resin, and has an inner surface 20a and an outer surface 20b. The outer surface sheet 30 is formed of a first outer surface sheet 31 made of a non-woven fabric made of a thermoplastic synthetic fiber and a film made of a thermoplastic synthetic resin, and a hot melt adhesive 2 is formed on the inner surface of the first outer surface sheet 31 (Fig. It consists of a liquid-impermeable second outer surface sheet 32 that is intermittently joined via (see 2), the outer surface 30b of the outer surface sheet 30 is formed by the first outer surface sheet 31, and the outer surface is formed by the second outer surface sheet 32. The inner surface 30a of the sheet 30 is formed. The core 40 is formed of a well-known or known liquid-absorbent material such as crushed pulp or a mixture of crushed pulp and a super absorbent polymer. Diaper 1 also has an inseam area 7, a front waist area 5 located in front of the inseam area 7, and a rear waist area 6 located behind the inseam area 7. It is drawn as seen from the front, and the rear waist circumference area 6 is located on the front side of the front waist circumference area 5. The inner surface sheet 20 and the outer surface sheet 30 extend from the peripheral edge of the core 40 and overlap each other, and the inner surface sheet 20 and the second outer surface sheet 32 are intermittently welded or adhered at the joint portion 3 in the direction around the waist of the diaper 1. By joining them so as to form a side edge portion 9a, 9b, 9c between the front and rear waist circumference areas 5, 6 and the inseam area 7, the front end edge portion 10a and the rear waist circumference area in the front waist circumference area 5 are further formed. It forms the trailing edge 10b at 6. In the front and rear waist circumference areas 5 and 6, the side edges 9a and 9b overlap in a palm-like shape, and the diaper 1 is intermittently lined up and down.<u style="single">Part</u>At 15, the waist circumference opening 11 is integrally formed, and in cooperation with the inseam region 7, a pair of leg circumference openings 12 are formed. At the peripheral edge between the waist opening 11 and the leg opening 12, a plurality of waist elastic members 13 and a plurality of leg elastic members 14 are located between the inner surface sheet 20 and the outer surface sheet 30, and these sheets 20, It is joined to at least one of the inner surfaces of 30 in an elongated state. Fastening tape 16 is attached to each of the side edges 9b of the rear waist circumference region 6. The fastening tape 16 is used to bring the front and rear waist circumferences 5 and 6 into close contact with the diaper wearer's torso and to roll the diaper 1 after use (see Fig. 4).

FIG. 2 is a diagram showing a line II-II cut surface of FIG. The fastening tape 16 is folded in either a Z-shape or an inverted Z-shape in the direction around the waist, and in FIG. 2, it is folded in a Z-shape. When the holding area 52c of the fastening tape 16 is picked and pulled toward the left side of the figure, that is, the outside of the side edge portion 9b indicated by the arrow A, the fastening tape 16 extends in the length direction thereof (see FIG. 3).

The fastening tape 16 of FIG. 2 has a tape piece 50 and a fastening means. The tape piece 50 has an inner surface m that faces the first outer surface sheet 31 when it is extended, and an outer surface n that is the opposite surface thereof. The tape piece 50 folded in a Z shape as shown in the figure includes a first tape portion 51 facing the first outer surface sheet 31, a second tape portion 52 having a gripping portion 52c, and a first tape portion 51. It is composed of a third tape portion 53 interposed between the second tape portion 52 and the second tape portion 52. The entire surface of the first tape portion 51 facing the first outer surface sheet 31 is attached to the first outer surface sheet 31 via the first adhesive 61, and the center line PP (center line PP) that bisects the width of the diaper 1. (See Fig. 1) It has an inner end portion 51a located closer to it and an outer end portion 51b located closer to the side edge portion 9b on the opposite side. The second tape portion 52 has an inner end portion 52a located closer to the center line PP and an outer end portion 52b located closer to the side edge portion 9b, and a gripping area 52c is provided at the tip portion of the outer end portion 52b. It is formed. The third tape portion 53 has an inner end portion 53a connected to the inner end portion 52a of the second tape portion 52 and an outer end portion 53b connected to the outer end portion 51b of the first tape portion 51. The second tape portion 52 has a pressure-sensitive second adhesive 62 that forms a fastening means on the inner surface m facing the third tape portion 53, except for the inner surface m of the gripping area 52c and the inner end portion 52a. It has been applied and is temporarily fixed to the inner surface m of the third tape portion 53 so as to be peelable. The third tape portion 53 has a pressure-sensitive third adhesive 63 coated on the outer surface n of the inner end portion 53a of the outer surfaces n facing the first tape portion 51, and the inner end portion of the first tape portion 51. It is temporarily fixed to the outer surface n of 51a so that it can be peeled off.

In FIG. 2, the joint portion 15 between the side edge portions 9a and 9b of the front and rear waist circumference regions 5 and 6 is pressed under heating or treated by an ultrasonic welder to form the inner surface sheet 20 and the first surface sheet 20 and the first. The outer surface sheet 31 and the second outer surface sheet 32 are melted and mixed together to form a film. At this site 15, the plurality of thermoplastic synthetic fibers forming the non-woven fabric on the inner surface sheet 20 and the first outer surface sheet 31 have lost their form as fibers and are no longer separated into individual fibers. The first adhesive 61 is for joining the first tape portion 51 to the first outer surface sheet 31 in a non-peelable manner, and the first tape portion 51 is connected to the first outer surface sheet 31 via the first adhesive 61. It is bonded to the non-woven fabric portion in 31 and the bonding portion 15 which is in the form of a film.

FIG. 3 is a diagram similar to FIG. 2 in which the fastening tape 16 is pulled in the direction of arrow A. When the fastening tape 16 is pulled in the direction of arrow A, the outer end portion 51b is moved from the first outer surface sheet 31 between the outer end portion 51b of the first tape portion 51 and the first outer surface sheet 31 at the side edge portion 9b. The force to peel it off acts. However, since the first tape portion 51 is joined to the portion 15 having the film-like outer surface via the first adhesive 61 at the outer end portion 51b, even if the fastening tape 16 is strongly pulled, the diaper 1 can be used. It never drops out. If the first tape portion 51 is located closer to the center line P than in the illustrated example and is bonded only to the non-woven fabric portion of the first outer surface sheet 31 and not to the portion 15, the fastening tape 16 When it is pulled strongly, the structure of the non-woven fabric is destroyed, in other words, the fibers in the non-woven fabric are disentangled, and the fibers in contact with the first adhesive 61 are peeled off from the non-woven fabric part, and the diaper 1 It may drop out of. Such a problem occurs because the strength of the adhesive force between the first adhesive 61 and their fibers is strong enough to disentangle the fibers in the outer sheet 31. To solve this problem, instead of simply strengthening or weakening the adhesive strength of the first adhesive 61, the first tape portion 51 is joined to the joint portion 15, and if necessary, the first It is preferable to strengthen the adhesive force of the adhesive 61.

FIG. 4 is a perspective view of the rolled diaper 1. Since the fastening tape 16 extended with the holding area 52c in FIG. 3 can be fixed to an appropriate part of the diaper 1 by using the second adhesive 62, the diaper 1 after use is shown in the illustrated example. It is preferable to roll it up like this. If there is slack around the waist of the worn diaper 1, the slack can be eliminated by extending the fastening tape 16 along the waist and tacking the diaper 1. Since the second adhesive 62 is used not only as a fastening means in this way but also as a means for holding the fastening tape 16 in a Z shape as shown in FIG. 2, these are used. The strength of the adhesive force is adjusted to suit the purpose. For example, the adhesive strength of the second adhesive 62 used as shown in FIG. 4 can be strengthened so that it cannot be peeled off from the portion where the fastening tape 16 is stopped, or weak so that it can be peeled off. You can also do it. Further, in FIG. 2, a surface treatment agent can be applied to the inner surface m of the third tape portion 53 facing the second adhesive 62 in order to facilitate the peeling of the second adhesive 62.

FIG. 5 is a diagram similar to FIG. 2 showing an example of an embodiment of the present invention. In the fastening tape 16 of the diaper 1, the tape piece 50 includes a first tape portion 51, a second tape portion 52, and a third tape portion 53, which are individual tape pieces. The outer end portion 51b of the first tape portion 51 is folded back and joined to the outer end portion 53b of the third tape portion 53 via the first adhesive 61 so as not to be peeled off. The inner end portion 53a of the third tape portion 53 is detachably joined to the inner end portion 51a of the first tape portion 51 via the third adhesive 63, and a part of the inner end portion 53a is folded back to the inside of the second tape portion 52. It is non-peelable bonded to the end 52a via a fourth adhesive 64. The tip portion 53c of the outer end portion 53b of the third tape portion 53 extends beyond the outer end portion 51b of the first tape portion 51 in the circumferential direction, and has a film-like outer surface via a fifth adhesive 65. It is non-peelable and joined to site 15. The inner end portion 51a of the first tape portion 51 is non-peelably bonded to the film-like portion 68 formed on the first outer surface sheet 31 via the first adhesive 61. The film-like portion 68 is a portion where the non-woven fabric of the first outer surface sheet 31 is changed into a film shape substantially in the same manner as the bonding portion 15, and the inner surface sheet 20, the first outer surface sheet 31, and the second outer surface sheet are formed. When 32 and 32 are pressed under heating or ultrasonically welded, they are melted and mixed together. The fastening tape 16 formed in this way is a fiber of the first outer surface sheet 31 when the fastening tape 16 is pulled even if a strong adhesive force is used for the first adhesive 61 and the fifth adhesive 65. Is not stripped off by these adhesives 61,65 and the fastening tape 16 does not fall off from diaper 1. As shown in FIGS. 2 and 5, the tape piece 50 changes into a film shape of the first outer surface sheet 31 at least one of both ends in the waist circumference direction in the portion facing the first outer surface sheet 31. It is preferable that it is joined to the part where it is formed.

FIG. 6 is a partially cutaway plan view of a disposable open-type diaper 101 showing an example of an embodiment of the present invention. The diaper 101 includes a liquid-permeable inner surface sheet 20 made of a non-woven fabric made of thermoplastic synthetic fibers, a substantially impermeable outer surface sheet 30 made of a non-woven fabric made of thermoplastic synthetic fibers, and both of these sheets. It consists of a liquid-absorbent core 40 intervening between 20 and 30, with an inseam area 7, a front waist area 5 located in front of the inseam area 7, and a rear waist area 6 located behind the inseam area 7. Has. The fastening tape 16 used in FIG. 2 is attached to each of the side edge portion 9b and the widthwise central portion of the edge portion 10b in the rear waist circumference region 6, and each fastening tape 16 is a virtual line. As shown by, it can be extended to the outside of the diaper 101 by pulling the gripping area 52c. In the outer surface sheet 30, the inner portion of the chain wire 71 is pressurized under heating, and the non-woven fabric forming the outer surface sheet 30 is changed into a film. Since the fastening tape 16 is bonded to this part via the first adhesive 61 (see FIG. 2), the tissue of the outer surface sheet 30 will not be destroyed and fall off from the diaper 101 even if it is pulled strongly. .. When attaching the fastening tape 16 to the edge portion 10b, the inner surface sheet 20 and the outer surface sheet 30 in the rear waist circumference region 6 are continuously or intermittently welded along the edge portion 10b between the side edge portions 9b. The outer surface sheet 30 can be changed into a film, and the fastening tape 16 can be bonded to the film.

In the present invention, the first outer surface sheet 31 of FIG. 2 and the outer surface sheet 30 of FIG. 6 made of a non-woven fabric can be processed into a film at any part where the fastening tape 16 should be attached. it can. The fastening means formed by the first adhesive is a hook member of a mechanical fastener composed of a hook member and a loop member, which can be fastened to the non-woven fabric forming the first outer surface sheet 31. You can also do it. When this hook member is used, it is preferable to temporarily fix the second tape portion 52 to the outer surface n of the third tape portion 53 in FIG. 2 so that the second tape portion 52 can be peeled off by using a non-woven fabric. The present invention can be carried out in worn articles such as training pants and pants for incontinence patients, in addition to the disposable diapers shown in the illustrated examples.

According to the present invention, it is possible to mass-produce worn articles capable of preventing the fastening tape from falling off.

<figref num="1">Partially broken perspective view of a disposable worn item (disposable diaper).</figref><figref num="2">The figure which shows the II-II line cut surface of FIG.</figref><figref num="3">A diagram similar to Fig. 2 with the fastening tape extended.</figref><figref num="4">A perspective view of a rolled diaper.</figref><figref num="5">FIG. 2 is a diagram similar to FIG. 2 showing an example of the embodiment.</figref><figref num="6">FIG. 3 is a partially cutaway plan view of an open diaper showing another example of the embodiment.</figref>

Code description

1 Disposable items to wear (diapers) 5 Front waist circumference 6 Rear waist circumference 7 Inseam area 9a, 9b, 9c side edges 10a, 10b edge 16 Fastening tape 50 pieces of tape 62 Fastening means (second adhesive)