JP2009061046A - Disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable diaper which has enhanced fitting to a part from buttocks to legs of a wearer. <P>SOLUTION: The disposable diaper 1 comprises an abdominal-side sheet member 2 and a back-side sheet member 3 extending in parallel with the lateral direction X and a groin sheet member 4 which extends in the longitudinal direction Y, is joined to the abdominal-side sheet member and the back-side sheet member, has a dimension in the lateral direction which is shorter than the abdominal-side sheet member and the back-side sheet member, and is equipped with a body fluid absorber 5. A waistline elastic member 6 is extended in the lateral direction and is joined to the abdominal-side sheet member and the back-side sheet member. Side edges 41 of the groin part which extend on both sides of the groin sheet member in the longitudinal direction are mutually in parallel when the disposable diaper is spread out to be in a plane, and the waistline elastic member is freely extended and contracted. An apparent width in the lateral direction of the groin sheet member is configured in such a manner that a width W2 at a boundary B2 to the back-side sheet member is greater than a width W1 at a boundary B1 to the abdominal sheet member when the groin sheet member is contracted. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a disposable diaper.

One type of disposable diaper is a diaper in which three substantially rectangular sheets are joined in an I shape (hereinafter referred to as a three-piece type).
The three-piece type diaper has a low manufacturing cost due to the fact that it is not cut off. However, since the crotch of the wearer is covered with a rectangular sheet, it is difficult to properly cover the crotch and the buttocks of the wearer. There is. In other words, a sheet with a width that appropriately covers the crotch cannot sufficiently cover the buttock, whereas a sheet with a width that adequately covers the buttock is constrained by the sheet hitting the crotch and the feeling of wearing is impaired.

For this reason, Patent Document 1 is formed by providing a crotch panel between a front waistline panel and a rear waistline panel that are opposed to and spaced apart from each other, and joining opposite side edges of the front waistline panel and the rear waistline panel. In a pant-type diaper having a waist opening and a pair of leg openings, a technique is disclosed in which the rear waist panel is wider than the front waist panel. The band width of the front and rear waistline panels here is a dimension in the wearer's height direction. Further, as shown in FIG. 1 of Patent Document 1, the waistline opening is defined by the joined front waistline panel and the upper edge (distal edge) of the rear waistline panel, and a pair of left and right legs The opening is defined by the lower edge (proximal edge) of the front waistline panel and the back waistline panel, and both side edges of the crotch panel.
International Publication No. 2006/017718 (Claim 1, FIG. 1, FIG. 7)

  The diaper of Patent Document 1 can cover the wearer's buttocks widely because the rear waistline panel has a wider band width. However, since the band widths of the front and rear waistline panels are different, there is a portion where the rear waistline panel is not joined to the front waistline panel. When this diaper is worn, this part may be lifted from the buttock, and may not fit well to the part from the buttock to the leg. In addition, since the diaper has a structure in which three substantially rectangular sheets are joined in an I shape, the pair of left and right leg openings are located on the side surfaces of the wearer's body and are parallel to each other. However, since the movable range of the human leg (thigh) extends to the front of the torso, in order to obtain a good fit to the leg of the diaper, the opening around the pair of legs opens slightly toward the front of the diaper. It is desirable that

  In view of the above, it is an object of the present application to provide a three-piece type disposable diaper having improved fit to a portion of the wearer's buttocks and a leg.

  The disposable diaper (hereinafter referred to as diaper) of the present invention has a longitudinal direction and a lateral direction perpendicular thereto, and extends in the longitudinal direction with a ventral seat member and a back seat member extending in parallel with the lateral direction. Including a crotch sheet member that is joined to and coupled to the abdominal sheet member and the back sheet member and that has a lateral dimension smaller than that of the abdominal sheet member and the back sheet member and that includes a body fluid absorber. It is assumed that the diaper is configured and substantially symmetric with respect to the longitudinal center line.

  Under this premise, the waist elastic member is joined to the ventral sheet member and the back seat member in the lateral direction, and at least the region where the waist elastic member of the ventral sheet member exists and the crotch sheet member have When overlapping and deploying disposable diapers on a flat surface, the crotch side edges extending in the longitudinal direction on both sides of the crotch sheet member are parallel to each other, releasing the extension of the waist elastic member, and the crotch together with the abdomen seat member and the back seat member The apparent width in the lateral direction of the crotch sheet member when the sheet member is contracted is such that the width at the boundary with the dorsal seat member is larger than the width at the boundary with the ventral sheet member And

  Here, in the present application, “when the disposable diaper is flattened” means that the abdominal sheet member, the back sheet member and the crotch sheet member constituting the disposable diaper are resisted against the elastic force of the waist elastic member or the like. It means expanding to become a flat surface. Also, “releasing the extension” means a drag force applied to the waist elastic member joined under the extension from the material constituting the abdominal seat member or the back seat member while no external force is applied to the diaper. It means to freely contract until it balances.

  In a preferred embodiment, the crotch elastic member is joined under extension along each crotch side edge of the crotch sheet member, and is separated from both crotch side edges and symmetrically about the longitudinal center line The bodily fluid absorber has both vertical sides extending in parallel with the crotch side edges, and the vertical sides are related to the longitudinal center line of the diaper that is curved inward of the bodily fluid absorber. It has a symmetrical curved part, and the curved part is located on the ventral sheet member side in the longitudinal direction.

In another preferred embodiment, when the disposable diaper is expanded in a plane, the stress of the waist elastic member that crosses at least the body fluid absorber on the abdominal sheet member side crosses at least the body fluid absorber on the back seat member side. Stress is greater than the waist elastic member.
In another preferred embodiment, a plurality of waist elastic members are joined to the ventral sheet member and the back seat member, and the waist elastic member crossing the body fluid absorber on the ventral sheet member side is more preferable. The space between the waist elastic members is narrower than that of the waist elastic member that crosses the body fluid absorber with the back seat member.
In still another preferred embodiment, the elasticity exhibited by the waist elastic member at least in the vicinity of the boundary between the back seat member and the crotch seat member out of the waist elastic member crossing the back seat member is the back seat member. It is lower than the elasticity exhibited by the waist elastic member in the other part.

  In another preferred embodiment, both the ventral side edges extending longitudinally on both sides of the ventral sheet member, and both dorsal edges extending longitudinally on both sides of the dorsal sheet member are provided. One waist opening formed by joining the members in an annular shape and defined by the annularly connected ventral seat member and the backside seat member, and the annularly connected ventral seat member and the backside The pants type has a sheet member and a pair of leg-hole openings defined by a crotch sheet member joined to both.

  In the diaper of the present invention, the apparent width in the lateral direction of the crotch sheet member when the expansion of the waist elastic member is released and the crotch sheet member is contracted together with the abdominal sheet member and the back sheet member is The width at the boundary with the back seat member is configured to be larger than the width at the boundary with the seat member. That is, the apparent width in the lateral direction is larger on the back side of the crotch sheet member than on the abdominal side, and the wearer's buttocks can be covered widely on the back side of the crotch sheet member having a larger width.

  Further, since the apparent width in the lateral direction is smaller on the abdominal side of the crotch sheet member, the seat does not hit the wearer's crotch and the feeling of wearing is not impaired. Furthermore, since the apparent width in the lateral direction of the crotch sheet member becomes narrower from the back side to the abdomen side, when the diaper is made into a pants type, the abdomen sheet member and the back sheet that are connected to the crotch sheet member in a ring shape A pair of leg-hole openings defined by the members open slightly toward the front of the diaper. With these, it is possible to provide a three-piece type disposable diaper having improved fit to a portion from the wearer's buttocks to the leg.

  A diaper 1 according to the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a plan view showing a diaper 1 according to the first embodiment expanded in a plane, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a waist elastic from the state shown in FIG. It is a top view showing the state which open | released expansion | extension of the member 6. FIG.

  Drawing 1 is a figure which looked at diaper 1 from the side which touches a wearer's skin. The diaper 1 is a rectangular ventral sheet member 2 extending in the lateral direction indicated by an arrow X, a rectangular dorsal seat member 3 spaced apart from the ventral sheet member 2 and extending in parallel in the lateral direction, and a vertical direction indicated by an arrow Y. And a rectangular crotch sheet member 4 joined to and connected to the vicinity of the center of the abdominal sheet member 2 and the back sheet member 3. The crotch sheet member 4 is smaller in dimensions in the lateral direction than the ventral sheet member 2 and the back sheet member 3, and includes a body fluid absorber 5. The diaper 1 has an I shape substantially symmetrical with respect to the longitudinal center line M, and the body fluid absorber 5 is also disposed symmetrically with respect to the longitudinal center line M.

  Each of the abdominal sheet member 2 and the back sheet member 3 includes a plurality of abdominal elastic members 61, which are the waist elastic member 6, between the breathable top sheet 11 and the back sheet 12. 62 is intermittently joined in the state extended in the horizontal direction. The abdominal rubber cord 61 is joined at a higher elongation rate than the back rubber cord 62, and the abdominal rubber cord 61 has a higher stress than the back rubber cord 62 when the diaper 1 is deployed on a flat surface. That is, the stress on the abdominal rubber cord 61 that crosses the body fluid absorber 5 is higher than that on the back rubber cord 62 that crosses the body fluid absorber 5. In addition, the space | interval between the adjacent belly side rubber strings 61 and the adjacent back side rubber strings 62 are constant. The crotch sheet member 4 is overlapped and joined to the region where the waist elastic member 6 of the abdominal sheet member 2 and the back sheet member 3 is present. When the diaper 1 is used, the top sheet 11 faces the wearer's skin, and the back sheet 12 faces the outside of the diaper 1.

  The rectangular crotch sheet member 4 has a larger area than the body fluid absorber 5, and the body fluid absorber 5 and the crotch elastic members 42 and 42 are enclosed between the rectangular liquid permeable sheet 43 and the liquid impermeable sheet 44. It becomes the composition. The liquid-permeable sheet 43 faces the wearer's skin when the diaper 1 is used, and the liquid-impermeable sheet 44 faces the outside of the diaper 1. When the diaper 1 is developed in a plane, the crotch side edges 41 and 41 extending in the vertical direction on both sides of the crotch sheet member 4 are parallel to each other. In addition, along the entire length of the crotch side edge 41, the crotch elastic member 42 is intermittently joined under extension. In this embodiment, a rubber string is used as the crotch elastic member 42.

  The body fluid absorber 5 is joined to the crotch sheet member 4 symmetrically with respect to the longitudinal center line M at a distance from both crotch side edges 41. The body fluid absorber 5 overlaps the ventral sheet member 2 and the dorsal sheet member 3, and the longitudinal length L1 that overlaps the ventral sheet member 2 is longer than the longitudinal length L2 that overlaps the dorsal sheet member 3. Also long. Thereby, when the diaper 1 is worn, the bodily fluid absorber 5 widely covers the front side of the wearer's crotch portion on the abdominal sheet member 2 side, and can efficiently absorb urine.

The body fluid absorber 5 has both vertical sides 51 extending substantially parallel to the both crotch side edges 41 of the crotch sheet member 4. Both vertical sides 51 are formed of an abdominal side parallel part 53 located on the abdominal side sheet member 2 side, a back side parallel part 54 located on the back side sheet member 3 side, an abdominal side parallel part 53 and a back side parallel part 54. The body fluid absorber 5 has a curved portion 52 which is inwardly curved toward the inside of the body fluid absorber 5 and symmetrical with respect to the longitudinal center line M of the diaper. The body fluid absorber 5 has a dumbbell shape. The lateral dimension of the curved portion 52 is smaller than the dorsal parallel portion 54 and the ventral parallel portions 53.
A part of the back side parallel part 54 overlaps with the back side sheet member 3, and a part of both the abdominal side parallel parts 53 overlaps with the belly side sheet member 2.

  The portions of the liquid-permeable sheet 43 and the liquid-impermeable sheet 44 that extend outward in the lateral direction from the curved portion 52 of the bodily fluid absorber 5 to the crotch side edges 41 are side flap portions 45. A crotch elastic member 42 extends from the crotch side edge 41 of the side flap 45. Since the body fluid absorber 5 is not joined to the side flap portion 45 and is lower in rigidity than the part to which the body fluid absorber 5 is joined, it can be easily deformed by expansion and contraction of the both crotch elastic members 42. .

  For each sheet constituting the diaper 1, a nonwoven fabric and / or a film made of a thermoplastic synthetic resin, which is known for disposable diapers, can be appropriately selected and used in consideration of required performance. The body fluid absorbent 5 can be used by wrapping a known body fluid absorbent material containing fluff pulp with tissue paper (not shown). Since the body fluid absorber 5 contains fluff pulp, the body fluid absorber 5 has higher rigidity than the liquid impermeable sheet 44 and the liquid permeable sheet 43 and is relatively difficult to deform. For the crotch elastic member 42 and the waist elastic member 6, in addition to a string-like rubber and a thermoplastic elastomer, a tape-like or belt-like rubber, a stretchable nonwoven fabric, or a resin film can be used.

Moreover, mutual joining of each sheet | seat, elastic member, etc. which comprise the diaper 1 can be performed by a well-known method in this field | area, such as adhesion | attachment by a hot-melt-adhesive, or heat welding.
The stress of the waist elastic member 6 when the diaper 1 is developed in a plane can be adjusted by the elongation rate when the waist elastic member 6 is joined under extension. Alternatively, the elongation rate is the same, and the stress can also be adjusted by changing the material of the waist elastic member 6 and the cross-sectional area.

  As shown in a cross-sectional view in FIG. 2, the ventral and dorsal rubber cords 61 and 62 include the top sheet 11 of the ventral and dorsal sheet members 2 and 3 and the liquid-impermeable sheet 44 of the crotch sheet member 4. Via the body fluid absorber 5. Since the members constituting the diaper 1 are joined to each other by a hot melt adhesive or the like (not shown), the belly side / back side rubber cords 61 and 62 are in the lateral direction (in FIG. 2, the direction perpendicular to the paper surface). ), The body fluid absorber 5 also contracts in the lateral direction together with the ventral and back sheet members 2 and 3 and the crotch sheet member 4.

  As shown in FIG. 3, when the abdominal and dorsal rubber cords 61 and 62 are opened and contracted in the lateral direction, the abdominal and dorsal sheet members 2 and 3 and the crotch sheet member 4 are imaginary lines. It contracts in the horizontal direction from the state developed on the plane to be represented to the state represented by the solid line. At this time, when the diaper 1 is developed in a plane, the stress on the ventral rubber cord 61 is higher than that on the back rubber cord 62, so that the ventral seat member 2 contracts more than the back seat member 3. The ventral parallel part 53 of the body fluid absorber 5 contracts more greatly.

  The crotch sheet member 4 also contracts in the lateral direction from the rectangular state indicated by the phantom line due to the contraction of the abdominal / back side rubber straps 61, 62, and becomes a trapezoidal state indicated by the solid line. As a result, the apparent width in the lateral direction of the crotch sheet member 4 is greater than the width W1 at the boundary B1 with the ventral sheet member 2 indicated by the phantom line in the width W2 at the boundary B2 with the back side seat member 3. Becomes larger. Here, “the apparent width in the lateral direction of the crotch sheet member 4” refers to the width between the crotch sheets when the lateral widths W 1, W 2 of the crotch sheet member 4 are reduced by contraction of the waist elastic member 6. This is the distance between the part side edges 41.

  Thus, by increasing the width W2 at the boundary B2 between the crotch sheet member 4 and the back sheet member 3, the crotch sheet member 4 can cover the wearer's buttocks more widely, and the leg from the buttocks The fit to the part applied to is improved. In addition, the crotch sheet member 4 contracts and the width W1 of the boundary B1 with the abdominal sheet member 2 is reduced, so that the crotch sheet member 4 does not loosen at the wearer's crotch and the wearing feeling is not impaired.

  Next, referring to FIGS. 4 to 6, the diaper 1 shown in FIG. 1 is provided with both belly side edges 21, 21 extending vertically on both sides of the ventral sheet member 2 and on both sides of the dorsal seat member 3. A diaper 1 having a pant shape in which the dorsal side edges 22 and 22 extending in the vertical direction are joined so that the abdomen sheet member 2 and the dorsal sheet member 3 are annular will be described. FIG. 4 is a perspective view of a diaper 1 having a pants type, and FIG. 5 is a diagram schematically showing the shape of a leg-periphery opening edge 81 when the diaper 1 having a pants type is viewed from the ventral sheet member 2. FIG. 6 is a schematic view of the pants-type diaper 1 as viewed from the back side sheet member 3 side.

  As shown in FIG. 4, the pant-type diaper 1 includes a waist opening 7 defined by an abdominal sheet member 2 and a back sheet member 3 connected in an annular shape, a ventral sheet member 2, a back It has a pair of leg periphery openings 8 defined by the side sheet member 3 and the crotch sheet member 4 joined to both. That is, in FIG. 1, the abdominal proximal edge 13 and the back proximal edge 14 extending in the lateral direction of the diaper 1, the abdominal sheet member 2 and the back sheet member 3 and sandwiching the crotch sheet member 4, and the crotch sheet member 4 A pair of leg-hole openings 8 are defined by leg-opening edges 81 formed by both crotch side edges 41. Also, a ventral distal edge 15 and a dorsal distal that extend laterally in parallel with the ventral proximal edge 13 and the dorsal proximal edge 14 and have a larger separation distance than the ventral proximal edge 13 and the dorsal proximal edge 14. A waistline opening 7 is defined by a waistline opening edge 71 formed by the edge 16.

  By the way, the side flap part 45 which is easy to deform | transform extends on the lateral direction outer side of the bodily fluid absorber 5 as mentioned above, and the crotch part elastic member 42 is joined under expansion | extension here. When the crotch sheet member 4 is bent so that the body fluid absorber 5 is on the inside in order to make the diaper 1 into a pants type, the crotch elastic member 42 contracts, so that the abdominal sheet member 2 and the back sheet member 3 The side flap portion 45 between the two stands up with respect to the body fluid absorber 5 as shown in FIG. By standing the side flap portion 45, a space 17 surrounded by the side flap portion 45 is formed. When the diaper 1 is worn, the space 17 is located between the wearer's crotch and the body fluid absorber 5, and can keep the excrement absorbed by the body fluid absorber 5 away from the skin of the wearer. .

  Here, the contracted crotch elastic member 42 tends to extend linearly between the abdominal sheet member 2 and the back sheet member 3, but is pulled toward the body fluid absorber 5 by the side flap portion 45. Therefore, as shown in FIG. 4, the crotch elastic member 42 has a semicircular arc shape between the abdominal sheet member 2 and the back sheet member 3, so that the crotch side edge 41 of the crotch sheet member 4 is also semicircular. It becomes an arc shape and forms a part of the leg periphery opening edge 81.

  As described above, the abdominal side parallel part 53 of the body fluid absorber 5 contracts more than the back side parallel part 54, and the apparent width in the lateral direction of the crotch sheet member 4 is the width on the abdominal side sheet member 2 side. The width W2 on the back seat member 3 side is larger than W1. Therefore, as shown in FIG. 5, when the diaper 1 is viewed from the front, the leg-periphery opening edge 81 extends in the horizontal direction of the diaper 1 while drawing an arc as it goes from the abdomen seat member 2 to the back seat member 3. Draw a trace toward the outside. In other words, the leg opening 8 opens toward the front of the diaper 1 slightly.

  Moreover, since the curved part 52 of the bodily fluid absorber 5 is located closer to the abdominal sheet member 2, the width in the lateral direction of the bodily fluid absorber 5 at the front side of the wearer's groin is relatively narrow. . Thereby, even when a wearer closes both legs, a crotch part is pressed by the bodily fluid absorber 5, and a discomfort is not felt. Further, even when the wearer moves his / her leg violently, the side flap portion 45 is deformed following the movement of the leg, so that a gap may be formed between the wearer's leg and the leg periphery opening edge 81 of the diaper 1. This prevents the excrement leakage.

  Further, as schematically shown in FIG. 6, when the pant-type diaper 1 is viewed from the back, the back side parallel portion 54 of the body fluid absorber 5 has a smaller contraction amount than the abdominal side parallel portion 53. The lateral dimension is larger than that of the side parallel part 53, and the wearer's buttocks can be covered widely.

Next, a diaper 1A according to a second embodiment will be described with reference to FIGS. FIG. 7 is a plan view showing the diaper 1A developed in a plane, FIG. 8 is a plan view showing a state in which the extension of the waist elastic member is released, and FIGS. 9 and 10 are respectively a pants-type diaper 1A on the ventral side. FIG. 4 is a schematic diagram viewed from the seat member 2 and the back seat member 3.
As shown in FIG. 7, in this embodiment, the main difference from the first embodiment is that the curved portion 52 of the bodily fluid absorber 5 overlaps the ventral sheet member 2.

In the illustrated example, the crotch sheet member 4 has the same configuration as that of FIG. 1, and the position where the crotch sheet member 4 is attached to the abdomen sheet member 2 and the back sheet member 3 is shifted to the abdomen sheet member 2 side. The bending portion 52 of the bodily fluid absorber 5 is overlapped with the boundary B1 between the abdominal sheet member 2 and the crotch sheet member 4 by further increasing the longitudinal length L1 at which the member 4 overlaps the abdominal sheet member 2. . Instead of this, the position where the curved portion 52 is formed in the body fluid absorber 5 can be changed, and the curved portion 52 can be overlapped with the boundary B1 between the ventral sheet member 2 and the crotch sheet member 4.
On the other hand, the back side parallel part 54 of the bodily fluid absorber 5 overlaps the boundary B <b> 2 between the back side sheet member 3 and the crotch sheet member 4. Therefore, when the lateral length of the body fluid absorber 5 at the boundary B1 and the boundary B2 is compared, the boundary B1 is shorter.

  The ventral seat member 2 and the back seat member 3 have the same configuration as in FIG. In other words, the stress on the abdominal rubber cord 61 and the back rubber cord 62 when deployed in a plane is greater in the abdominal rubber cord 61. In addition, since the raw material of each sheet | seat member, the joining method, etc. are common in 1st Embodiment, detailed description is abbreviate | omitted.

  As shown in FIG. 8, when the abdominal and dorsal rubber cords 61 and 62 are extended and contracted in the lateral direction, the abdominal and dorsal sheet members 2 and 3 and the crotch sheet member 4 are imaginary lines. It contracts in the horizontal direction from the state developed on the plane to be represented to the state represented by the solid line. Here, the portions of the abdominal and dorsal sheet members 2 and 3 that do not overlap with the body fluid absorber 5 are not affected by the highly rigid body fluid absorber 5, and therefore are compared with the portions that overlap with the body fluid absorber 5. Easy to shrink.

  Therefore, the lateral length of the crotch sheet member 4 after the contraction of the abdominal / dorsal rubber cords 61 and 62 at the boundaries B1 and B2 between the abdominal sheet member 2 and the back sheet member 3 and the crotch sheet member 4 In addition to the fact that the stress on the ventral rubber cord 61 is large, the length overlapping the body fluid absorber 5 is short, so that the boundary B1 becomes shorter. That is, the apparent width in the lateral direction of the crotch sheet member 4 is greater in the width W2 at the boundary B2 with the back side seat member 3 than with the width W1 at the boundary B1 with the ventral side sheet member 2 indicated by the phantom line. growing.

  Therefore, as shown in FIG. 9, when the diaper 1 </ b> A is viewed from the front, the leg-hole opening 8 opens slightly forward of the diaper 1 </ b> A. Comparing the case where the body fluid absorber 5 having the same shape is used in the first and second embodiments, the lateral length of the body fluid absorber 5 at the boundary B1 is shorter in the second embodiment, so The opening 8 opens toward the front of the diaper 1 </ b> A and has a shape that is more easily fitted to the wearer's leg.

  Further, as schematically shown in FIG. 10, when the pant-type diaper 1A is viewed from the back, the back side parallel part 54 of the body fluid absorber 5 is the abdominal side parallel part as in the first embodiment. Since the amount of shrinkage is smaller than 53, the lateral dimension is larger than the ventral parallel part 53, and the wearer's buttocks can be covered widely.

  In this embodiment, the curved portion 52 of the bodily fluid absorber 5 overlaps the boundary B1 between the abdominal sheet member 2 and the crotch sheet member 4, and the bodily fluid absorber 5 is disposed at the boundary B2 between the back sheet member 3 and the crotch sheet member 4. As a result, the lateral dimension at the boundary B1 of the body fluid absorber 5 becomes smaller than the lateral dimension at the boundary B2. For this reason, it can deform | transform and implement so that the stress of the abdominal side rubber string 61 and the back | dorsal rubber string 62 when it expand | deploys on a plane may become the same. Alternatively, the stress on the abdominal rubber cord 61 can be made lower than that on the back rubber cord 62.

  That is, in this embodiment, as long as the ventral sheet member 2 can be contracted by the ventral rubber cord 61, the lateral widths W1 and W2 of the crotch sheet member 4 are at the boundary B1 where the curved portions 52 overlap. The width W1 is shorter than the width W2 at the boundary B2. Therefore, it is not essential to contract the abdominal sheet member 2 side more than the back sheet member 3 side.

  As mentioned above, based on 1st, 2nd embodiment, although the three-piece type disposable diaper 1 by which the fitting property with respect to the part concerning a leg from a wearer's buttocks was improved was demonstrated, this invention is not limited to this but various It can be changed and implemented.

  As one modified example, a plurality of waist elastic members 6 are joined to the abdominal sheet member 2 and the back sheet member 3, and the body fluid absorber is disposed on the abdomen sheet member 2 side from the back sheet member 3 side. The space between the waist elastic members 6 crossing 5 can be made narrow. For example, in the first or second embodiment, the pitch interval between the abdominal rubber cords 61 that cross the body fluid absorber 5 on the abdominal sheet member 2 side, and the back that crosses the body fluid absorber 5 on the back sheet member 3 side. What is necessary is just to change to the structure which narrows the pitch space | interval between the side rubber strings 62. FIG. At this time, the stress of the belly side rubber cord 61 and the back side rubber cord 62 can be made the same. This corresponds to a configuration in which the number of back-side rubber strings 62 that cross the body fluid absorber 5 on the back-side sheet member 3 side in FIG. 1 is reduced.

Alternatively, on the back side sheet member 3 side, the configuration is such that there is no waist elastic member 6 across the bodily fluid absorber 5, or the number of abdominal rubber cords 61 across the bodily fluid absorber 5 is changed to the dorsal sheet member. It is also possible to make more than the back rubber cord 62 that crosses the body fluid absorber 5 on the 3 side. At this time, as described above, the stress on the abdominal rubber cord 61 is the same, and the pitch interval between the abdominal rubber cords 61 is between the back rubber cords 62 crossing the body fluid absorber 5 on the back sheet member 3 side. It is preferable to further reduce the pitch interval.
In short, it is only necessary that the contraction rate of the waist elastic member 6 that crosses the body fluid absorber 5 on the abdominal sheet member 2 side is larger than that on the back sheet member 3 side.

  As another modified example, the waist circumference elastic member 6 at least in the vicinity of the boundary B <b> 2 between the back side sheet member 3 and the crotch sheet member 4 among the waist circumference elastic members 6 (back side rubber strings 62) crossing the back side sheet member 3. The elasticity which the member 6 exhibits can be set as the structure lower than the elasticity which the trunk periphery elastic member 6 in the other site | part of the back | dorsal sheet | seat member 3 exhibits. In other words, the contraction rate of the back seat member 3 varies depending on the location, and at least the contraction rate in the vicinity of the boundary B2 between the back seat member 3 and the crotch seat member 4 is contraction of other parts of the back seat member 3. The configuration can be smaller than the rate. In addition, since the diaper 1 obtained by this modification does not change in appearance from the diaper 1 shown in FIGS. 1 to 6, the illustration is omitted.

  In this way, in order to vary the elasticity exhibited by the waist elastic member 6 or the contraction rate of the back sheet member 3 depending on the region, cutting treatment and heat treatment of the waist elastic member 6 in the vicinity of the boundary B2 of the back sheet member 3 Alternatively, a method of eliminating the elasticity of the waist elastic member 6 by a known means such as chemical treatment can be used. At this time, when there is a waist elastic member 6 that crosses the body fluid absorber 5, it is preferable to eliminate the elasticity of the waist elastic member 6. In this way, the body fluid absorber 5 does not contract laterally on the back seat member 3 side, so that the width W2 on the back seat member 3 side can be reliably increased and the body fluid absorber 5 can be It can be prevented that wrinkles occur in the direction and cause leakage.

  Further, the elasticity of the waist elastic member 6 is also lost on the abdominal sheet member 2 side, and the width W2 on the back side sheet member 3 side is larger than the width W1 on the abdominal side sheet member 2 side of the crotch sheet member 4. Can be increased. In this case, for example, the material, the number, and the elongation rate of the abdominal rubber cord 61 and the back rubber cord 62 are the same, and the elastic disappearance width range is larger on the back side sheet member 3 side than on the abdominal side sheet member 2 side. A wide configuration can be achieved.

  Further, when the elasticity of the waist elastic member 6 on the side of the abdominal sheet member 2 is eliminated in this way, the body fluid absorber 5 positioned on the side of the abdominal sheet member 2 mainly absorbs urine, thereby preventing urine leakage. Therefore, it is preferable to eliminate the elasticity of the portion to be flattened. As a specific example, the configuration in which the elasticity of the waist circumference elastic member 6 in the portion along the periphery of the body fluid absorber 5 that overlaps the ventral sheet member 2 is eliminated, so that the lateral direction of the body fluid absorber 5 and the circumference of the body fluid absorber 5 Urine leakage in the direction toward the opening 7 can be prevented.

  The waist elastic member 6 is cut by cutting the waist elastic member 6 together with the back sheet member 3 with a cutter. When cutting the waist circumference elastic member 6 with a cutter, the waist circumference elastic member 6 that crosses the body fluid absorber 5 is cut. When the elasticity of the waist elastic member 6 on the back seat member 3 side is lost by heat treatment, it is preferable to use a known thermoplastic elastomer such as urethane or styrene for the waist elastic member 6.

  Alternatively, when the waist elastic member 6 is joined to the back seat member 3, the stretch rate of the waist elastic member 6 is periodically changed to join at least the vicinity of the boundary B2 of the back seat member 3. The elasticity exhibited by the waist elastic member 6 can be made different depending on the site by using a method in which the stretch rate of 6 is made lower than the stretch rate of the waist elastic member 6 joined to another part. Or you may make the elasticity which the trunk | drum circumferential elastic member 6 of the center part along the vertical direction center line M of the back side seat member 3 exhibits relatively lower than the site | part of the both sides.

  In this way, the elasticity exhibited by the waist elastic member 6 in the other part is greater than the elasticity exhibited by the waist elastic member 6 near the boundary B2 between the back sheet member 3 and the crotch sheet member 4. . This is because when the diaper 1 is formed in a pants shape, the elasticity of the waist elastic member 6 acts in the direction of widening the apparent width W2 in the lateral direction at the boundary between the crotch sheet member 4 and the back sheet member 3. (See FIGS. 6 and 10).

  In this case as well, the contraction rate of the waist elastic member 6 on the ventral sheet member 2 side is made larger than that on the back seat member 3 side. Moreover, it is preferable to reduce the elasticity exhibited by the waist elastic member 6 near the boundary B2 of the back seat member 3 as much as possible. Thereby, it can be set as the diaper 1 whose width | variety W2 by the side of the back | dorsal side sheet member 3 is larger than the width | variety W1 by the side of the stomach side member 2 of the crotch sheet member 4.

  As yet another modification, the body fluid absorber 5 may have a structure in which the portion overlapping the ventral sheet member 2 side is more easily contracted in the lateral direction than the portion positioned on the back seat member 3 side. . As an example of such a structure, the fiber density of the fluff pulp of the body fluid absorber 5 is reduced on the abdominal sheet member 2 side than the back sheet member 3 side, so that the abdominal sheet member 2 side is compressed. For example, it can be easily deformed.

  In addition to the above, the ventral sheet member 2 and the dorsal seat member 3 are not limited to rectangular sheets having the same shape and the same size. For example, the longitudinal dimension of the dorsal sheet member 3 is set to the vertical dimension of the ventral sheet member 2. It can be larger than the directional dimension. In addition, a rectangular or square sheet is cut along a sinusoidal curve or a sawtooth wave-like bending line extending in the lateral direction so as to have a symmetrical shape with respect to the longitudinal center line that bisects the lateral dimension. One of the sheets obtained in this way can be the ventral sheet member 2 and the other can be the dorsal sheet member 3. Alternatively, the ventral sheet member 2 or the dorsal sheet member 3 can be formed by folding a single sheet and sandwiching a plurality of rubber strings or the like therebetween.

  As for the shape of the crotch sheet member 4, it is sufficient that both crotch side edges 41 extending in the vertical direction when the diaper 1 is developed in a plane are parallel to each other, and the shape of both end edges connecting the crotch side edges 41 is a straight line, Either a curved line or a bent line may be used. Further, the liquid-permeable sheet 43 and the liquid-impermeable sheet 44 constituting the crotch sheet member 4 may be a single sheet or a composite sheet composed of two or more sheets.

The top view which expands and represents the diaper of 1st Embodiment on a plane. II-II sectional view taken on the line of FIG. The top view showing the state which open | released the expansion | extension of a trunk periphery elastic member. The perspective view of the diaper made into the underpants type. Fig. 3 is a schematic diagram of a pants-type diaper viewed from a ventral sheet member. FIG. 3 is a schematic diagram of a pants-type diaper viewed from a back sheet member. The top view which expands and represents the diaper of 2nd Embodiment on a plane. The top view showing the state which open | released the expansion | extension of a trunk periphery elastic member. Fig. 3 is a schematic diagram of a pants-type diaper viewed from a ventral sheet member. FIG. 3 is a schematic diagram of a pants-type diaper viewed from a back sheet member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Abdomen side sheet member 3 Back side sheet member 4 Crotch sheet member 5 Body fluid absorber 6 waist circumference elastic member 7 Trunk circumference opening 8 Leg circumference opening 21 Both abdominal side edges 22 Both back side edges 41 Crotch part side edge 42 Crotch elastic member 51 Both vertical sides 52 Curved part

Claims (6)

Having a longitudinal direction and a transverse direction perpendicular thereto,
A ventral seat member and a dorsal seat member extending in parallel to the lateral direction;
It extends in the vertical direction and is joined to the ventral sheet member and the dorsal sheet member to connect them, and the lateral dimension is smaller than that of the ventral sheet member and the dorsal sheet member, and absorbs bodily fluids. A crotch sheet member comprising a body, and a disposable diaper substantially symmetrical with respect to a longitudinal centerline,
A waist elastic member is extended in the lateral direction and joined to the ventral sheet member and the dorsal sheet member,
The region where the waist elastic member of at least the ventral sheet member exists and the crotch sheet member overlap,
When deploying the disposable diaper flat, the crotch side edges extending in the longitudinal direction on both sides of the crotch sheet member are parallel to each other,
The apparent width in the lateral direction of the crotch sheet member when the waist elastic member is released and the crotch sheet member is contracted together with the ventral sheet member and the dorsal sheet member is the ventral side. A disposable diaper characterized in that the width at the boundary with the back seat member is larger than the width at the boundary with the seat member. A crotch elastic member is joined under extension along each of the crotch side edges of the crotch sheet member, and is separated from the crotch side edges and symmetrically with respect to the longitudinal center line. Is arranged,
The bodily fluid absorber has both longitudinal sides extending in parallel with the crotch side edges,
The two vertical sides have a curved portion that is curved inward of the body fluid absorber and is symmetric with respect to the longitudinal center line.
The disposable diaper according to claim 1, wherein the curved portion is positioned on the ventral sheet member side in the longitudinal direction.   When the disposable diaper is deployed on a flat surface, the waist elastic member that crosses at least the body fluid absorber on the abdominal sheet member side crosses at least the body fluid absorber on the back seat member side. The disposable diaper according to claim 1 or 2, wherein the stress is greater than that of the member.   A plurality of the waist elastic members are joined to the ventral sheet member and the back seat member, and the waist elastic member crossing the body fluid absorber on the ventral sheet member side is more The disposable diaper according to any one of claims 1 to 3, wherein a space between the waist circumference elastic members is narrower than the waist circumference elastic members crossing the body fluid absorber on the side sheet member side.   Among the waist elastic members crossing the back seat member, at least the elasticity of the waist elastic member in the vicinity of the boundary between the back seat member and the crotch seat member is different from that of the back seat member. The disposable diaper according to any one of claims 1 to 4, wherein the disposable diaper is lower than the elasticity exhibited by the waist elastic member in the region.   Both ventral side edges extending in the vertical direction on both sides of the ventral sheet member and both dorsal edges extending in the vertical direction on both sides of the dorsal sheet member are formed such that the ventral sheet member and the dorsal sheet member are annular. A waist opening formed by joining the ventral sheet member and the dorsal seat member connected in an annular manner, and the ventral sheet member and the doubly connected in an annular manner. The disposable diaper according to any one of claims 1 to 5, wherein the disposable diaper has a side sheet member and a pair of leg-hole openings defined by the crotch sheet member joined to the side sheet member.

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