JP5498147B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper.

  Conventionally, an absorbent body that absorbs body fluid such as urine provided in a disposable diaper returns the absorbed body fluid when pressure is applied due to the movement or posture of the wearer, and the returned body fluid leaks into the disposable diaper. May occur. Then, the disposable diaper provided with the liquid-permeable barrier sheet with the liquid-permeable back sheet is known as a disposable diaper. For example, in Patent Document 1, a liquid-impermeable and vapor-permeable barrier sheet is interposed between a top sheet and a back sheet, and from each front and rear end of the diaper to each front and rear end of the absorber. A disposable diaper is provided that extends inward and covers the front and rear ends of the absorbent body with a barrier sheet.

  In such a disposable diaper described in Patent Document 1, since the front and rear ends of the absorbent body are covered with a liquid-impermeable back sheet and a barrier sheet, the absorbent body absorbs bodily fluids such as urine. It is possible to prevent body fluid from leaking from the front and rear ends. However, in the disposable diaper described in Patent Document 1, since the barrier sheet is polymerized on the surface side of the front and rear end portions of the absorbent body, it is suppressed that the absorbent body absorbs body fluid such as urine and the absorbent body swells. It may be difficult to maximize the absorption capacity of

JP-A-3-268754

  Accordingly, an object of the present invention is to provide a disposable diaper that can prevent leakage of body fluid from the front and rear ends of an absorber that has absorbed body fluid such as urine, and can maximize the absorption capacity of the absorber. There is.

  The present invention relates to a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent disposed between these sheets, and a water-repellent water disposed between the absorbent and the top sheet. A disposable diaper provided with a barrier sheet, wherein the barrier sheet is longer than a width of the absorbent body and is disposed so as to cover an end portion in a longitudinal direction of the absorbent body, and surrounds the end portion of the absorbent body. The present invention provides a disposable diaper which is not fixed to the absorbent body in the region of the pocket so as to form a pocket, and is fixed to the back sheet outside the peripheral edge of the absorbent body.

  According to the disposable diaper of the present invention, it is possible to prevent leakage of body fluid from the front and rear ends of the absorber that has absorbed body fluid such as urine and to maximize the absorption capacity of the absorber.

Drawing 1 is a top view which looked at the disposable diaper of a 1st embodiment of the present invention from the surface sheet side. 2 is a cross-sectional view taken along line Y1-Y1 of FIG. 3 is a cross-sectional view taken along line X1-X1 of FIG. FIG. 4 is a sectional view taken along line X1-X1 of the disposable diaper of the second embodiment of the present invention. FIG. 5 is a sectional view taken along line Y1-Y1 of the disposable diaper of the third embodiment of the present invention. FIG. 6 is a cross-sectional view taken along line X1-X1 of the disposable diaper of the third embodiment of the present invention.

  Hereinafter, the disposable diaper of this invention is demonstrated based on the preferable 1st Embodiment, referring FIGS. 1-3.

  As shown in FIG. 1, a disposable diaper 1A of the first embodiment (hereinafter also referred to as “diaper 1A”) includes a liquid-permeable top sheet 2, a liquid-permeable back sheet 3, and these sheets. An absorbent body 4 disposed between two and three and a water-repellent barrier sheet 5 disposed between the absorbent body 4 and the top sheet 2 are provided. As shown in FIG. 1, the diaper 1A is formed symmetrically with respect to the center line CL. Accordingly, in the following description, the right side of the symmetrical part will be mainly described.

  The diaper 1A according to the first embodiment will be described in detail. As shown in FIG. 1, the diaper 1A includes an abdominal side A located on the abdomen side of the wearer at the time of wearing, a back side B located on the back side, and A crotch part C is disposed between the ventral side A and the back side B. As shown in FIG. 1, the diaper 1 </ b> A has both side edges in the longitudinal direction (hereinafter referred to as “Y direction”; Y direction: a direction parallel to the center line CL) at the center in the longitudinal direction (Y direction). The width of both end portions in the longitudinal direction (Y direction) is wider than the width of the central portion in the longitudinal direction (Y direction). As shown in FIG. 1, the diaper 1 </ b> A includes a liquid-permeable top sheet 2 that forms the inner surface of the diaper 1 </ b> A, a liquid-permeable back sheet 3 that forms the outer surface of the diaper 1 </ b> A, It has an intervening liquid-retaining absorbent 4 and a water-repellent barrier sheet 5 disposed between the absorbent 4 and the top sheet 2. As shown in FIG. 1, the absorber 4 has a rectangular shape that is long in the longitudinal direction (Y direction). As shown in FIG. 1, each of the top sheet 2 and the back sheet 3 covers the entire surface of the absorbent body 4 on the skin contact surface side and the entire surface of the non-skin contact surface side, and extends from the periphery of the absorbent body 4. ing. As shown in FIG. 1, the top sheet 2 has a shorter length in the width direction (hereinafter referred to as “X direction”. X direction: a direction perpendicular to the center line CL) than the back sheet 3. Yes.

  In the diaper 1 </ b> A, as shown in FIG. 1, side sheets 6 are arranged on both side portions in the longitudinal direction (Y direction) via a surface sheet 2. As shown in FIG. 1, the side sheet 6 is disposed and fixed on the skin contact surface side of the top sheet 2 over the entire side part in the longitudinal direction (Y direction). As shown in FIG. 1, the inner end of each side seat 6 in the width direction (X direction) is a free end. Is stretched and fixed in the longitudinal direction (Y direction), and when worn, a portion of a predetermined width from the free end is separated from the top sheet 2 by a contraction force of the elastic member to form a three-dimensional gather To do.

  As shown in FIG. 1, the side sheet 6 and the back sheet 3 that extend outward in the width direction (X direction) are joined to the diaper 1 </ b> A in the ventral side A and the back side B, respectively. Part 11 is formed. As shown in FIG. 1, the diaper 1 </ b> A includes a side sheet 6 and a back sheet 3 that extend outward in the width direction (X direction) in the crotch part C to form a leg flap portion 12. . An elastic member (not shown) for forming leg gathers is stretched in the longitudinal direction (Y direction) and arranged and fixed in the longitudinal direction (Y direction) in the crotch C at the leg flap portion 12 and worn. Sometimes a leg gather is formed by the contraction force of the elastic member. As shown in FIG. 1, the diaper 1 </ b> A includes a fastening tape 7 on each side flap portion 11 in the back side portion B, and a target tape (not shown) for fastening the fastening tape 7 on the outer surface of the abdominal side portion A. I have.

  As shown in FIGS. 1 to 3, the water-repellent barrier sheet 5 is disposed between the absorber 4 and the top sheet 2. As shown in FIGS. 1 and 3, the barrier sheet 5 is longer than the width of the absorbent body 4 (length in the X direction), and is disposed between both side flap portions 11 and 11 in the back side portion B. The absorber 4 is arranged so as to cover the end in the longitudinal direction (Y direction). Specifically, in the diaper 1A of the first embodiment, the barrier sheet 5 has a rectangular shape that is long in the X direction, as shown in FIG. As shown in FIG. 1, the barrier sheet 5 of the diaper 1 </ b> A includes an end 4 a on the ventral side A side in the longitudinal direction (Y direction) of the absorbent body 4 and a back side part in the longitudinal direction (Y direction) of the absorbent body 4. Absorption from the viewpoint of preventing the liquid returned from the absorber 4 from leaking from the back side end of the diaper 1A due to the pressurization when the wearer takes a posture on the back of the B side end 4b. The body 4 is disposed so as to cover the end 4b on the back side B in the longitudinal direction (Y direction). In addition, in the diaper 1A of 1st Embodiment, although the barrier sheet 5 is distribute | arranged only to the edge part 4b by the side of the back B of the absorber 4, the edge part 4a by the side of the stomach side A of the absorber 4a. And it may be distribute | arranged to each edge part 4b by the side of the back side B of the absorber 4, and may be distribute | arranged only to the edge part 4a by the side of the ventral | abdominal side A of the absorber 4.

  As shown in FIGS. 1 to 3, the barrier sheet 5 is fixed to the absorbent body 4 in the region of the pocket 50 so as to form a pocket 50 that surrounds an end portion in the longitudinal direction (Y direction) of the absorbent body 4. However, it is fixed to the back sheet 3 outside the peripheral edge 40 of the absorber 4. Specifically, in the diaper 1A of the first embodiment, the barrier sheet 5 is fixed by the back sheet 3 and the fixing portion 8 outside the peripheral edge 40 of the absorber 4, as shown in FIGS. Has been. That is, as shown in FIGS. 1 to 3, the barrier sheet 5 is fixed to the back sheet 3 between the peripheral edge 40 of the absorber 4 and the edge 8 a on the diaper center CT side in the fixing portion 8. In other words, an unbonded region is formed, and a region of the pocket 50 surrounding the end portion 4b on the back side B side of the absorber 4 is formed. In the region of the pocket 50, the barrier sheet 5 is not fixed to the absorber 4 as shown in FIGS. As shown in FIG. 1, the barrier sheet 5 is fixed to the back sheet 3 by the fixing portion 8 in a region outward from the edge 8 a of the fixing portion 8. As shown in FIG. 1, it is preferable that the space | interval (W1) of the edge 8a of the fixing | fixed part 8 and the periphery 40 of the absorber 4 is 5 mm-25 mm, and it is still more preferable that they are 5 mm-15 mm.

  As shown in FIG. 3, from the viewpoint of forming a pocket 50 surrounding the end portions 4a and 4b of the absorber 4, the edge 8a of the fixing portion 8 disposed on both side portions 1a in the longitudinal direction (Y direction) of the diaper 1A. , 8a, the length (L2) of the barrier sheet 5 is preferably longer than the length (L1) of the back sheet 3 between the end edges 8a, 8a of the fixing portion 8. Specifically, the ratio of the length (L2) of the barrier sheet 5 between the edges 8a, 8a of the fixed portion 8 and the length (L1) of the back sheet 3 between the edges 8a, 8a of the fixed portion 8 ( L2 / L1) is preferably 105 to 135%, more preferably 115 to 130%.

  In the diaper 1 </ b> A of the first embodiment, as shown in FIGS. 2 and 3, the barrier sheet 5 is fixed to the topsheet 2 in the region of the pocket 50 from the viewpoint of opening the pocket 50. As described above, the barrier sheet 5 is not fixed to the absorber 4 in the region of the pocket 50, but in the diaper 1A, as shown in FIGS. The surface on the non-skin contact surface side (surface on the absorber 4 side) of the topsheet 2 disposed on the absorber 4 and the surface on the skin contact surface side of the barrier sheet 5 are fixed.

  In the diaper 1 </ b> A of the first embodiment, as shown in FIGS. 2 and 3, the barrier sheet 5 has a higher rigidity than the top sheet 2 from the viewpoint of facilitating opening of the pocket 50 by the barrier sheet 5. Is used. Specifically, the rigidity of the barrier sheet 5 is preferably 0.5 to 1.2 N in terms of a bulk softness value from the viewpoint of easily opening the pocket 50 and less likely to cause a sense of incongruity when worn. .9N is more preferable. Moreover, since the rigidity of the surface sheet 2 directly touches the skin, from the viewpoint that a soft texture is preferable, the bulk softness value is preferably 0.1 to 0.5N, and more preferably 0.15 to 0.4N. The bulk softness value can be measured by the following method.

[Measurement method of bulk softness value]
The barrier sheet 5 is cut out as a strip having a size of 150 mm in the X direction and 30 mm in the Y direction, and a cylinder having a diameter of 45 mm and a height of 30 mm is formed using the strip, and the cylinder is formed in the height direction. Compress with a Tensilon compression tester at a compression rate of 10 mm / min and measure the maximum compressive strength until the cylinder buckles. This measurement is performed 5 times, and an average value of 5 times is taken as a bulk softness value. As with the measurement of the bulk softness value of the barrier sheet 5, the measurement of the bulk softness value of the topsheet 2 is cut out as a strip having a size of 150 mm in the X direction and 30 mm in the Y direction in FIG. To measure.

The material for forming the disposable diaper 1A of the first embodiment will be described.
As the surface sheet 2, the back sheet 3, and the side sheet 6, as long as they are usually used for absorbent articles such as disposable diapers, they can be used without particular limitation. For example, a hydrophilic and liquid-permeable nonwoven fabric can be used as the top sheet 2, and a liquid-permeable or water-repellent resin film or a laminate of a resin film and a nonwoven fabric is used as the back sheet 3. The side sheet 6 may be a stretchable film, a nonwoven fabric, a woven fabric, or a laminated sheet thereof. The absorbent body 4 can be used without particular limitation as long as it is normally used for absorbent articles such as disposable diapers, and an absorbent core composed of absorbent polymer particles and fiber material is used as a tissue paper. What is covered with can be used. The fastening tape 7 and the target tape (not shown) can be used without particular limitation as long as they are usually used for absorbent articles such as disposable diapers.

  The barrier sheet 5 can be used without particular limitation as long as it is normally used for absorbent articles such as disposable diapers, and is a liquid-impervious or water-repellent nonwoven fabric, a resin film, or a laminate of a resin film and a nonwoven fabric. A body or the like can be used. Specifically, as the barrier sheet 5, a spunbond nonwoven fabric (S) -melt blown nonwoven fabric (M) -spunbond nonwoven fabric (S) composite nonwoven fabric (SMS) is inexpensive and has high liquid permeability or water repellency. From the viewpoint that it can be used, it is preferably used.

  For fixing the top sheet 2, the back sheet 3, the barrier sheet 5, and the side sheet 6, an adhesive used for absorbent articles such as disposable diapers, and fusion means such as heat embossing, ultrasonic embossing, and high-frequency embossing Is used.

  Three-dimensional gather forming elastic members (not shown), leg flap 12 forming elastic members (not shown) include natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, ethyl acrylate- A thread-like stretchable material made of a polyethylene-α-olefin copolymer such as ethylene can be used.

The effect at the time of using the disposable diaper 1A of 1st Embodiment of this invention mentioned above is demonstrated.
The diaper 1A of 1st Embodiment is provided with the water-repellent barrier sheet 5 distribute | arranged between the absorber 4 and the surface sheet 2, as shown in FIGS. As shown in FIG. 1, the barrier sheet 5 is longer than the width of the absorber 4 (length in the X direction), and as shown in FIGS. 1 to 3, the end in the longitudinal direction (Y direction) of the absorber 4 The back sheet 3 is fixed to the outer side of the peripheral edge 40 of the absorbent body 4 so as to form a pocket 50 surrounding the part. Therefore, it is possible to prevent leakage of body fluid from the end portions 4a and 4b before and after the longitudinal direction (Y direction) of the absorbent body 4 that has absorbed body fluid such as urine during wearing of the diaper 1A. Moreover, since the barrier sheet 5 and the absorber 4 are not fixed in the region of the pocket 50 so as to form the pocket 50, it is suppressed that the absorber 4 swells by absorbing body fluid such as urine. It is difficult, and the absorption capacity of the absorber 4 can be maximized.

  Moreover, in the diaper 1A of 1st Embodiment, as shown in FIG.2, FIG.3, the longitudinal direction (Y direction) of the absorber 4 by the water-repellent barrier sheet 5 and the liquid-impermeable back sheet 3 is used. Are surrounded by a pocket 50. That is, in the diaper 1 </ b> A, as shown in FIGS. 2 and 3, a space is formed between the absorber 4 and the barrier sheet 5. Therefore, even if pressure is applied to the absorbent body 4 that has absorbed bodily fluid such as urine due to the movement or posture of the wearer and the absorbed bodily fluid is returned, the returned bodily fluid is temporarily held in the pocket 50 region. After that, when the pressurization is released, the absorbent body 4 sucks back again, so that leakage of body fluid can be prevented.

Next, the disposable diaper of 2nd Embodiment of this invention is demonstrated based on FIG.
About the disposable diaper 1B of 2nd Embodiment (henceforth "diaper 1B"), a different point from 1A of disposable diapers of 1st Embodiment is demonstrated. The point which is not demonstrated especially is the same as that of 1 A of disposable diapers of 1st Embodiment, and description of 1 A of disposable diapers of 1st Embodiment is applied suitably.

  In the diaper 1B of 2nd Embodiment, as shown in FIG. 4, the point by which the provided barrier sheet 5 is an uneven | corrugated shaped sheet | seat by embossing differs from the diaper 1A. This will be specifically described below.

  In the diaper 1B of the second embodiment, as shown in FIG. 4, the barrier sheet 5 includes a water-repellent nonwoven fabric, a resin film, a laminate of a resin film and a nonwoven fabric, and the like. It is a sheet provided with a concavo-convex shape by being inserted between a pair of metal rolls that are meshed and subjected to steel match embossing. As for the unevenness | corrugation of the barrier sheet 5, as shown in FIG. 4, it is preferable that the height (h) of each convex part is 0.8 mm-4.0 mm, and it is further 1.0 mm-2.5 mm. Preferably, the width (W2) of each convex portion is preferably 1 mm to 10 mm, more preferably 2 mm to 7 mm, and the interval (W3) between the convex portions is 1 mm to 10 mm. Is preferable, and it is still more preferable that it is 2 mm-7 mm.

  The formation material of the disposable diaper 1B of 2nd Embodiment is demonstrated. About the diaper 1B of 2nd Embodiment, it is the same as that of the formation material of 1 A of disposable diapers of 1st Embodiment, and description of 1 A of disposable diapers of 1st Embodiment is applied suitably.

The effect at the time of using the disposable diaper 1B of 2nd Embodiment of this invention mentioned above is demonstrated.
About the effect of the diaper 1B of 2nd Embodiment, a different point from the effect of the diaper 1A of 1st Embodiment is demonstrated. The point which is not demonstrated in particular is the same as the effect of the diaper 1A of the first embodiment, and the description of the effect of the unfolded disposable diaper 1A of the first embodiment is applied as appropriate.

  In the diaper 1B of the second embodiment, as shown in FIG. 4, since the barrier sheet is a sheet with an uneven shape, the space of the pocket 50 region is not easily crushed even when worn, and body fluid leaks. Further, it can be prevented. Moreover, since the pressure added to the absorber 4 is relieved by a wearer's movement and attitude | position, the quantity which returns the absorbed liquid can be reduced. Furthermore, since the concavo-convex shape can be maintained against the tensile force applied during processing, high processing stability can be exhibited.

Next, the disposable diaper of 3rd Embodiment of this invention is demonstrated based on FIG. 5, FIG.
About the disposable diaper 1C of 3rd Embodiment (henceforth "diaper 1C"), a different point from 1A of disposable diapers of 1st Embodiment is demonstrated. The point which is not demonstrated especially is the same as that of 1 A of disposable diapers of 1st Embodiment, and description of 1 A of disposable diapers of 1st Embodiment is applied suitably.

  In the diaper 1C of 3rd Embodiment, as shown to FIG. 5, FIG. 6, the point provided with the bulky nonwoven fabric (sublayer sheet | seat 9) on the absorber 4 differs from diaper 1A. This will be specifically described below.

  In the diaper 1C of 3rd Embodiment, as shown in FIG. 5, it is between the barrier sheet 5 and the absorber 4 which form the pocket 50, Comprising: On the absorber 4, a bulky nonwoven fabric (sublayer sheet 9) ). The sublayer sheet 9 extends from the inside to the outside of the pocket 50 of the barrier sheet 5. The sublayer sheet 9 has a rectangular shape that is long in the Y direction, and preferably extends from the inside of the pocket 50 of the barrier sheet 5 to the crotch C as shown in FIG. The length of the diaper 1C is preferably 30 to 80%, and more preferably 40 to 70%. The sublayer sheet 9 has a length (L4) in the X direction that is shorter than the length (L1) between the edges 8a of the fixing portions 8 of the back sheet 3 constituting the pocket 50, as shown in FIG. Specifically, the ratio (L4 / L1) is preferably 20 to 50%, and more preferably 25 to 40%. The thickness of the sublayer sheet 9 is preferably 0.8 mm to 3.5 mm, and more preferably 1 mm to 2.5 mm.

  A material for forming the disposable diaper 1 </ b> C of the third embodiment will be described. About the diaper 1C of 3rd Embodiment, a different point from the formation material of 1 A of disposable diapers of 1st Embodiment is demonstrated. The point which is not demonstrated especially is the same as that of the formation material of 1 A of diapers of 1st Embodiment, and description of 1 A of disposable diapers of 1st Embodiment is applied suitably.

  Examples of the sublayer sheet 9 include a hydrophilic nonwoven fabric and a hydrophilic short fiber aggregate. As the non-woven fabric, it is preferable to use a bulky material, specifically, an air-through non-woven fabric or an air-laid non-woven fabric from the viewpoint of forming the pocket 50 and the absorbability.

The effect at the time of using the disposable diaper 1C of 3rd Embodiment of this invention mentioned above is demonstrated.
About the effect of 1 C of diapers of 3rd Embodiment, a different point from the effect of 1 A of diapers of 1st Embodiment is demonstrated. The point which is not demonstrated in particular is the same as the effect of the diaper 1A of the first embodiment, and the description of the effect of the unfolded disposable diaper 1A of the first embodiment is applied as appropriate.

  In the diaper 1 </ b> C of the third embodiment, as shown in FIGS. 5 and 6, a bulky nonwoven fabric (sub-sub) between the barrier sheet 5 and the absorbent body 4 forming the pocket 50 and on the absorbent body 4. Since the layer sheet 9) is provided, the region of the pocket 50 is easily forcibly opened, and body fluid leakage can be further prevented. Further, even when an excessively high pressure is applied due to the movement or posture of the wearer, the area of the pocket 50 is maintained, so that leakage can be prevented. Moreover, processing is easy and high processing stability can be expressed.

  The disposable diaper of this invention is not restrict | limited at all to the disposable diaper of the above-mentioned 1st, 2nd, 3rd embodiment, It can change suitably. Moreover, each structural requirement in the above-mentioned 1st, 2nd, 3rd disposable diaper can be suitably combined and implemented in the range which does not impair the meaning of this invention.

  For example, the disposable diapers 1A, 1B, and 1C of the first, second, and third embodiments described above are so-called unfolded disposable diapers as shown in FIG. 1, but are pants-type disposable diapers. May be,

  The disposable diaper may be a disposable diaper for infants or adults.

1A, 1B, 1C Disposable diaper 2 Top sheet 3 Back sheet 4 Absorber 4a Abdominal side portion A in the longitudinal direction (Y direction) of the absorber 4b Back side portion B in the longitudinal direction (Y direction) of the absorber End 40 Perimeter 5 Barrier sheet 50 Pocket 6 Side sheet 7 Fastening tape 8 Fixing part 8a Edge of fixing part 9 Sublayer sheet 11 Side flap part 12 Leg flap part A Abdominal part, B Dorsal part, C Inseam CL Centerline extending in the longitudinal direction of the diaper, CT Center of the diaper

Claims (4)

A liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber disposed between these sheets, and a water-repellent barrier sheet disposed between the absorber and the top sheet A disposable diaper provided,
In the region of the pocket, the barrier sheet is longer than the width of the absorbent body and is arranged so as to cover the longitudinal end portion of the absorbent body and form a pocket surrounding the end portion of the absorbent body. Is not fixed to the absorber, and is fixed to the back sheet outside the periphery of the absorber ,
The barrier sheet is a disposable diaper whose rigidity is higher than that of the top sheet .   The disposable diaper according to claim 1, wherein the barrier sheet is fixed to the top sheet in the area of the pocket.   The disposable diaper according to claim 1 or 2, wherein the barrier sheet is an uneven sheet formed by embossing. On the absorbent body, a bulky nonwoven fabric is provided,
The bulky nonwoven fabric, a disposable diaper according to any one of claim 1 to 3, which extends over from the inside to the outside of the pocket of the barrier sheet.