JP5173733B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper.

In a conventional disposable diaper, in particular a disposable diaper that does not have an elastic member that expands and contracts in the diaper width direction on the waist flap part of the back side having a fastening tape, depending on the wearer's posture, the wearer's skin and waist flap part A gap is likely to be formed between the two and the excrement may leak to the back side through the gap.
As a technique for preventing leakage from the waistline region, it has been proposed to form a tack portion extending in the longitudinal direction from the edge in the longitudinal direction of the diaper in the waistline region disposed on the abdomen and / or back side of the wearer. (See Patent Document 1).
Moreover, the diaper which provided the dart which extends in the crotch part direction from this waist end edge in the vicinity of the waist end edge distribute | arranged to the stomach side is also known (refer patent document 2). Furthermore, a disposable diaper is known in which a folded portion is formed on the back sheet side of the back side portion having the fastening tape and an elastic sheet is fastened across the folded portion (see Patent Document 3).

JP 2001-137280 A Japanese Utility Model Publication No. 62-132107 Japanese Utility Model Publication No. 7-15018

However, since the tack part and darts in Patent Documents 1 and 2 are fixed so that the vicinity of the waist edge of the folded part or the entirety thereof is not expanded again, as shown in FIG. At the time of standing or standing upright, the vicinity of the waist edge 11 strongly hits the skin, irritate the skin, and the feeling of wearing or fitting is reduced. Further, when the vicinity of the waist edge 11 hits the skin relatively strongly as described above, a portion S floating from the skin is generated below the vicinity of the waist edge, and leakage may easily occur through the gap. is there.
The disposable diaper of patent document 3 fits a wearer's body shape by the elastic sheet straddling the folding part expanding and contracting, but when the elastic sheet does not extend to the maximum, the skin contact of the diaper In the surface, a portion corresponding to the fold portion has a raised portion, a wrinkle, a crease, etc., and since the facing surfaces are not bonded to each other, a hollow gap is formed in the longitudinal direction, and leakage to the back side Is likely to occur. Further, there is a possibility that the edge of the elastic sheet fixed to the back sheet may be caught on clothes or the like, or may be turned over and bonded to the clothes.

  Accordingly, an object of the present invention is to provide a disposable diaper that has improved fit to the wearer's back and is excellent in wearing feeling and leakage prevention performance.

  The present invention relates to a disposable diaper having a back side portion having a fastening tape, a crotch portion, and a ventral side portion having a landing tape for fastening the fastening tape. A tack portion extending toward the surface is formed, and the tack portion is formed by folding a part of the diaper and joining opposing surfaces in a part of the folded portion. The above object is achieved by providing a disposable diaper in which a portion having a predetermined width from the waist edge is a non-fixed portion where the opposing surfaces are not joined to each other.

  The disposable diaper of the present invention has improved fit to the wearer's back and is excellent in wearing feeling and leakage prevention performance. In addition, there is no problem with clothes such as those with an elastic sheet fastened to the back sheet side.

Hereinafter, the present invention will be described based on preferred embodiments thereof.
FIG. 1 is a plan view partially showing a disposable diaper according to an embodiment of the present invention.
As shown in FIG. 1, the disposable diaper 1 of the present embodiment (hereinafter also simply referred to as diaper 1) includes a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3, and both the sheets 2. , 3 is provided.
The diaper 1 is a so-called unfolded diaper, and in order from one end edge 11 in the longitudinal direction to the other end edge 12, the back side portion A having the fastening tapes 5, 5, the crotch portion B, and the fastening tape. An abdominal side C having a landing tape 6 for fastening 5 and 5 is provided. The fastening tapes 5 and 5 are provided on the left and right side edges of the back side A, and the landing tape 6 is provided on the outer surface (non-skin contact surface) of the abdominal side C. When the diaper is worn, the back side portion A is usually positioned on the wearer's back side and the ventral side portion C is positioned on the wearer's belly side. The crotch B is disposed between the wearer's crotch.

The top sheet 2 has a rectangular planar view shape that is wider than the absorber 4, and is disposed in the center in the width direction of the back sheet 3. The top sheet 2 is arranged over the entire length of the diaper 1 in the longitudinal direction. The back sheet 3 has an hourglass-like outer shape that matches the outer shape of the diaper.
A three-dimensional gather forming sheet 72 having an elastic member 71 is disposed on each side in the longitudinal direction of the diaper 1 so as to cover both side portions of the top sheet 2. The three-dimensional gather forming sheet 72 is arranged below the straight line 72a shown in FIG. 1 in the diaper width direction and outside the straight lines 72b and 72c shown in FIG. 1 in the diaper longitudinal direction. It is joined to the material (the front sheet 2 or the back sheet 3) via an adhesive. On the other hand, the portion surrounded by the straight line 72a, the straight line 72b, and the straight line 72c is not fixed to the sheet material arranged under the straight line 72a, and stands up apart from the sheet material to form the three-dimensional gathers 7 and 7. .

  A pair of leg elastic members 8 and 8 are disposed on the outer sides of both side edges 41 and 41 in the longitudinal direction of the absorbent body 4 in the crotch part B of the diaper 1. The leg elastic members 8 and 8 are fixed between the back sheet 3 and the three-dimensional gather forming sheet 72 in an extended state, and form leg gathers in the leg portions arranged around the legs.

As shown in FIG. 1, tack portions 9 and 9 extending from the waist end edge 11 toward the crotch B direction are formed on the back side portion A of the diaper 1 of the present embodiment.
The tack portions 9 and 9 are formed in the waist flap portion D in the back side portion A, and are formed on both sides of the center line CL extending in the longitudinal direction of the diaper.
Here, as shown in FIG. 1, the waist flap portion D is a region between the waist edge 11 and the position of the edge 42 of the absorbent body 4 in the diaper longitudinal direction. The end edge 42 of the absorbent body 4 is one of the end edges 11 and 12 existing at both ends in the longitudinal direction of the diaper 1, and the end edge 42 of the absorbent body 4 is closer to the waist edge 11 among both end edges in the longitudinal direction of the absorbent body 4 Is the edge of

  FIG. 2 is an enlarged view showing the right tack portion 9 of the two tack portions 9, 9 shown in FIG. The two tack portions 9 and 9 have the same configuration except that they are line-symmetric with respect to the center line CL extending in the longitudinal direction of the diaper.

As shown in FIG. 2, the tack portion 9 in the present embodiment is formed by folding a part 13 of the diaper 1 and opposing surfaces (a face 14, a face 14, and a face 15) in a part 91 of the folded part 13. And the surfaces 15) are joined together.
The part 13 of the diaper 1 that is folded to form the tack part 9 is a part of the above-described waist flap part D, and the above-described three-dimensional gather forming sheet 72, the top sheet 2 and the back sheet 3 are laminated. It consists of the laminated body 10 of a structure.

As shown in FIG. 2, the laminated body 10 in the tack portion 9 is bent at each of the two bent portions 16 and 17 extending along the longitudinal direction of the diaper 1, and the entire thickness direction is integrally Z. It is folded in a letter shape.
Of the two bent portions 16 and 17, in the bent portion 16 closer to the diaper center line CL, the laminated body 10 constituting the waist flap portion D has a surface 10a on the skin contact surface side as a mountain, non-skin The abutting surface 10b is bent so as to form a valley, and two surfaces 14 and 14 facing each other are generated in the folded portion 13 by the bending.
Of the two bent portions 16 and 17, in the bent portion 17 far from the diaper center line CL, the laminated body 10 constituting the waist flap portion D has a surface 10a on the skin contact surface side as a valley, The surface 10b on the abutment surface side is bent so as to form a mountain, and the other two surfaces 15 and 15 facing each other are generated in the folded portion 13 by the bending.

2 and 3B, the tack portion 9 is located between the waist edge 11 of the back side A and the position of the edge 42 of the absorbent body 4 in the longitudinal direction of the diaper 1, that is, the back. The waist flap portion D of the side portion A has a fixing portion 91 in which the above-described facing surfaces (the surface 14 and the surface 14 and the surface 15 and the surface 15) are joined. As shown in FIG. 2, the position of the end edge 42 of the absorber 4 includes the position of an extension line 42 a that extends the end edge 42 of the absorber 4 in parallel to the diaper width direction.
In the fixing portion 91 in the present embodiment, as shown in FIG. 3B, the two sets of opposing surfaces (the surface 14 and the surface 14 and the surface 15 and the surface 15) are respectively interposed through the adhesive 18. Are joined.

  As shown in FIG. 2 and FIG. 3A, the tack portion 9 in the diaper 1 of the present embodiment has a portion having a predetermined width from the waist end edge 11, facing each other (surface 14, surface 14, and surface 15. The surface 15) is a non-fixed portion 92 that is not joined.

  According to the diaper 1 of the present embodiment, when a force pulling in the diaper width direction is applied to the back side portion A, the fixing portion 91 in the tack portion 9 maintains its folded state, and in the diaper longitudinal direction. While the size of the portion 91A having the fixing portion 91 in the waistline direction is not greatly expanded, the non-fixing portion 92 is displaced between the opposing surfaces, and the tack portion 9 is slightly expanded from the folded state. Or it can be in a fully deployed state.

Therefore, as shown in FIG. 4, even if the vicinity of the waist edge 11 of the dorsal side A comes into contact with the wearer's back when in the supine position or upright, that portion is not fixed to the tack portion 9. Since the portion 92A is a portion 92A that can be flexibly expanded and contracted in the waist direction, the skin 92 is prevented from being strongly stimulated or uncomfortable by the portion 92A.
On the other hand, the fixing portion 91 described above is present in a portion 91A spaced apart from the waist edge 11 of the back side portion A by a predetermined width, and the width of the diaper squeezed by the presence of the tack portion 9 is maintained relatively stably. Therefore, by pulling and fastening the fastening tape 5 to the landing tape 6, the portion 91A can be effectively fitted to the curved portion 94 of the wearer's back. The good fit is not hindered by the fact that the vicinity of the waist edge 11 is a portion 92A that can be flexibly expanded and contracted. Therefore, it is excellent in fit and leakage prevention performance.

From the viewpoint of preventing irritation to the skin due to the waist edge 11 hitting the back and discomfort, etc., the length L1 (see FIG. 2) of the non-fixed portion 92 of the tack portion 9 is determined between the waist edge 11 and the absorber 4. It is preferable that it is 10 to 90% with respect to the distance L2 between the end edges 42, More preferably, it is 20 to 60%, More preferably, it is 25 to 50%.
However, the length L1 is preferably 5 mm or more, more preferably 10 mm or more. About the upper limit of the said length L1, it is preferable that this length L1 is 50 mm or less.

  In terms of the position of the fastening tape 5, the length L1 (see FIG. 2) of the non-fixed portion 92 of the tack portion 9 is the waist edge from the viewpoint of improving the fit of the wearer to the back. 11 to 10% to 90% of the length L3 (see FIG. 1) from the base end 51 of the fastening tape 5 to the midpoint 51a in the longitudinal direction of the diaper, and more preferably 15 to 70%. More preferably, it is 20 to 50%.

  The length L4 [see FIG. 3 (a)] of each tack portion 9 in the diaper width direction is preferably 2 to 10 mm, and more preferably 3 to 7 mm. When a plurality of tack portions 9 are formed in the width direction of the diaper as in the present embodiment, the total length L4 of the tack portions 9 in the diaper width direction is the total length L5 of the waist edge 11 of the back side portion A ( 1 to 10%, more preferably 1.5 to 8%, still more preferably 2 to 5%.

  As shown in FIGS. 2 and 3C, the tack portion 9 in the diaper 1 of the present embodiment is located on the crotch portion B side than the fixing portion 91 described above. , And the surface 15 and the surface 15) have a second non-fixed portion 93 that is not joined. By providing such a second non-fixed portion 93, the size of the waistline can be reduced without causing wrinkles in the vicinity of the edge 42 of the absorber and the absorber 4.

The length L6 (see FIG. 2) of the second non-fixed portion 93 of the tack portion 9 is 15 to 95% with respect to the distance L2 between the waist end edge 11 and the end edge 42 of the absorber 4. Preferably, it is 25 to 80%, more preferably 40 to 70%.
Further, the lower limit of the length L6 is preferably 5 mm or more, more preferably 10 mm or more.

Moreover, as shown in FIG. 1, the tack part 9 in the diaper 1 of this embodiment is between the position of one leg part elastic member 8 and the position of the other leg part elastic member 8 in the width direction of a diaper ( (Range indicated by G in FIG. 5). The position of one leg elastic member 8 and the position of the other leg elastic member 8 are when a plurality of leg elastic members 8 are arranged on the left and right sides of the diaper 1 as shown in FIG. The positions P8, P8 of the leg elastic members 8a, 8a located on the outermost side in the diaper width direction on the right and left sides of the diaper, respectively.
As described above, since the tack portions 9 and 9 are provided between the positions P8 and P8 of the leg elastic members 8a and 8a, the waist flap portion is located on the back of the wearer because the portion that reduces the waist circumference by the tack is located. It is preferable from the viewpoint of eliminating the gap between the skin and the skin.

Moreover, the tack | tuck part 9 in the diaper 1 of this embodiment is formed in the width | variety (range shown by E in FIG. 5) of the absorber 4, as shown in FIG.
When the tack portion 9 is within the width of the absorbent body 4, the fit of the end portion in the longitudinal direction of the absorbent body 4 (in the vicinity of the end edge 42) to the wearer's skin can be improved. This configuration is more preferable when the distance L2 (see FIG. 2) between the waist edge 11 and the absorber edge 42 is relatively wide, for example, when the distance L2 is 25 mm or more, particularly 30 to 60 mm. .

  The forming material of each part in the diaper 1 will be described. As the top sheet 2, the back sheet 3, the absorber 4, the three-dimensional gather forming sheet 72, etc., various kinds of materials conventionally used as respective materials in conventional disposable diapers. Materials and the like can be used without particular limitation. For example, the surface sheet 2 can be a nonwoven fabric by various manufacturing methods, a perforated film, a laminate thereof, or the like. The absorbent body 4 is a fiber assembly (may be a nonwoven fabric) made of pulp fibers or the like. A material obtained by coating a highly water-absorbing polymer with tissue paper or a water-permeable nonwoven fabric can be used. Further, as the back sheet 3, a moisture permeable or non-moisture permeable resin film, a laminated body in which a nonwoven fabric is integrated with the resin film, or the like can be used. As the three-dimensional gather forming sheet 72, a water-repellent nonwoven fabric (thermal Bond nonwoven fabrics, spunbond nonwoven fabrics, spunbond-meltblown-spunbond nonwoven fabrics, spunbond-meltblown-meltblown-spunbond nonwoven fabrics, and the like, and laminates of resin films and nonwoven fabrics can be used.

As mentioned above, although one embodiment of the disposable diaper of the present invention was shown and the present invention was described, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. is there.
For example, the tack portion 9 in the diaper 1 described above is formed within the width of the absorbent body 4, but, like the tack portion 9 'shown in FIG. A tack portion can be formed between each position 41 and a position P8 of the leg elastic member 8 located outside each side edge 41 (range indicated by F in FIG. 5).
By providing the tack portion 9 ′ in such a portion F, it is possible to prevent distortion from occurring in the vicinity of the edge 42 of the absorbent body 4, and to further prevent a gap between the absorbent body 4 and the skin. it can. This configuration is more preferable when the distance L2 (see FIG. 2) between the waist edge 11 and the absorber edge 42 is relatively narrow, for example, when the distance L2 is 30 mm or less, particularly 15 to 25 mm. .

Moreover, in the adhering part 91 in the diaper 1 described above, two pairs of opposing surfaces are joined together, but either one of the opposing surfaces (surface 14 and surface 14, or surface 15 and surface 15). Only may be joined.
Moreover, in the tack part 9 shown in FIG. 2, the surface 10a by the side of a skin contact surface is a mountain and a non-skin contact surface in the bending part 16 near the diaper center line CL among two bending parts. The surface 10b is bent so as to form a valley, and in the bent portion 17 far from the CL, the surface 10a on the skin contact surface side is a valley and the surface 10b on the non-skin contact surface side is a mountain. Although it is bent, conversely, even if it is bent so that the surface 10a on the skin contact surface side is a valley and the surface 10b on the non-skin contact surface side is a mountain in the bent portion closer to the diaper center line CL. Good.

Furthermore, various known joining methods such as heat sealing, ultrasonic sealing, and high frequency sealing can be used for joining the opposing surfaces of the fixing portion 91 in place of the adhesive.
FIG. 6 shows an example in which a part of the waist flap portion on the back side portion is folded in a Z shape and the portion is integrally joined by heat sealing. The heat sealing is performed by heating the folded portion integrally with two circular pins. Even when the fixing portion 91 is formed by heat sealing or the like, the same effect as the diaper 1 described above can be obtained.

  In addition, the diaper part 13 that is folded to form the tack part is not limited to the diaper 1 made of the laminated body 10 described above, and may have another structure that can constitute the waist flap part. good. For example, a structure in which only the top sheet 2 and the back sheet 3 are stacked may be used, or a structure in which only the back sheet 3 and the three-dimensional gather forming sheet 72 are stacked may be used. In addition to the three-dimensional gather forming sheet 72, the top sheet 2, and the back sheet 3, another sheet may be laminated.

  In the disposable diaper of this invention, although it is not necessary to arrange | position an elastic member along the diaper width direction to the waist flap part D of the back side part A, you may distribute such an elastic member. For example, an elastic member can be disposed in a portion sandwiched between the left and right tack portions 9 and 9 so as not to overlap the tack portions 9 and 9.

FIG. 1 is a plan view partially showing a disposable diaper according to an embodiment of the present invention. FIG. 2 is an enlarged view of the tack portion of the disposable diaper shown in FIG. 3 is a cross-sectional view of the tack portion shown in FIG. 2, wherein (a) is a cross-sectional view taken along line II in FIG. 2, (b) is a cross-sectional view taken along line II-II in FIG. 2, and (c) is a cross-sectional view. It is a figure which shows the III-III line cross section of 2. FIG. 4 is a side view showing a wearing state of the disposable diaper shown in FIG. 1. FIG. 5 is an explanatory diagram for explaining a preferred region in which the tack portion is provided. 6A and 6B are diagrams showing a tack portion according to another embodiment of the present invention, in which FIG. 6A is a view corresponding to FIG. 2, and FIG. 6B is a view showing a cross section taken along line IV-IV. . It is a side view which shows the wearing condition of the conventional diaper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 11 Waist edge 2 Top sheet 3 Back sheet 4 Absorbent body 42 Absorber edge 5 Fastening tape 6 Landing tape 7 Solid gather 8 Leg part elastic member 9 Tack part 91 Adhering part 92 Non-adhering part 93 Second non-adhering Fastening part A dorsal side B inseam C ventral side

Claims (5)

In a disposable diaper comprising a dorsal side having a fastening tape, a crotch part, and a ventral side having a landing tape for fastening the fastening tape,
A tack portion extending from the waist edge toward the crotch portion is formed on the back side portion,
The tack part is formed by folding a part of the diaper and joining the opposing surfaces in a part of the folded part,
The tack part is a non-adhered part in which a part having a predetermined width from the waist edge is not joined to each other .
The tack portion includes the non-fixed portion, the fixed portion in which the opposing surfaces are joined to each other, and the fixed portion between the waist edge of the back side portion and the position of the edge of the absorber. The disposable diaper which has a 2nd non-adhesion part which is formed in the crotch part side, and the said opposing surfaces are not joined . A pair of leg elastic members are arranged on the outer sides of both side edges of the absorbent body in the crotch part, and the tack portion is positioned at one leg elastic member and the other leg in the diaper width direction. It is formed between the position of the elastic member, according to claim 1 Symbol placing disposable diaper. The tuck portion, in the diaper width direction, and both side edges of the respective positions of the absorber, is formed between the position of the leg portion elastic member located outside the respective side edges, claim 2 The disposable diaper described. The disposable diaper according to claim 1 or 2 , wherein the tack portion is formed within a width of the absorber. The unbonded portion, the is more than 5mm in length from the waist end edge, any one disposable diaper according to claims 1-4.

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