JP5978378B1 - Disposable diapers - Google Patents

Abstract

[PROBLEMS] To realize a disposable diaper that is comfortable to wear and prevents leakage of excreta. An abdominal waistline in a lateral direction includes an absorbent main body, a back waistline portion located on one end side of the absorbent main body, and a ventral waistline portion 30 located on the other end side of the absorbent main body. A cut portion 40 is provided at the upper end of the ventral waistline portion in the longitudinal direction, and a plurality of elastic members along the lateral direction are arranged on the ventral waistline portion, Between the lower end of a cut part and the upper end of an absorptive core, the 1st field 34 along the horizontal direction, the 2nd field along the horizontal direction located in the lower part of the vertical direction rather than the 1st field 35, and wrinkles are generated in the first region and the second region due to the contraction of the elastic member, and the wrinkles generated in the first region in a range including at least the position where the cut portion is provided in the lateral direction. The number is less used than the number of wrinkles in the second area. Discarded diapers. [Selection] Figure 5

Description

  The present invention relates to a disposable diaper.

  As a disposable diaper, a disposable diaper having a front waist, a crotch part, and a back body, in which one waist opening and a pair of leg openings are formed, and an absorbent body is widely used. Some disposable diapers have a shape in which the upper edge of the front body has a downwardly convex shape (for example, Patent Document 1). According to such a disposable diaper, for example, when an elderly person who takes a forward-bending posture wears, even if the ventral side has a surplus on the crotch compared to the back side, it suppresses the extra length at the ventral part it can.

JP 2012-192115 A

  In the disposable diaper described in Patent Document 1, an elastic material around the waist is disposed around a downward convex portion provided on the upper edge of the front body. Therefore, the convex part facing downward tends to shrink and become hard, and the wearing comfort is reduced. On the other hand, the elastic material is not arrange | positioned in the vicinity of the upper end edge of an absorptive main body provided with an absorber. Therefore, it is difficult for the absorbent body to be in close contact with the wearer, and there is a possibility that excrement may leak.

  This invention is made | formed in view of the above problems, Comprising: It aims at implement | achieving the disposable diaper which is comfortable to wear and suppresses the leakage of excrement.

  A main invention for achieving the above object is an absorbent main body having a longitudinal direction and a transverse direction intersecting with the longitudinal direction and having an absorbent core for absorbing excrement, and one end of the absorbent main body. A disposable diaper comprising a dorsal waistline portion located on the side and a ventral waistline portion located on the other end side of the absorbent main body, the central portion of the abdominal waistline portion in the lateral direction, A cut portion is provided at an upper end of the ventral waistline portion in the longitudinal direction, and a plurality of elastic members along the lateral direction are disposed on the ventral waistline portion, and a lower end of the cut portion in the longitudinal direction. A first region along the lateral direction between the upper end of the absorbent core and a second region located on the lower side in the longitudinal direction than the first region and along the lateral direction The first region by contraction of the elastic member and In the range including at least the position where the cut portion is provided in the lateral direction, the number of wrinkles generated in the first region is generated in the second region. It is a disposable diaper characterized by having fewer than the number of bags.

  Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  According to the present invention, it is possible to provide a disposable diaper that is comfortable to wear and suppresses leakage of excreta.

It is a perspective view of a disposable diaper. It is a top view of a diaper of a deployment state. It is sectional drawing in the center part in the horizontal direction of the unfolded diaper. It is the figure which showed the diameter and expansion ratio of the ventral side rubber thread. FIG. 5A is an explanatory diagram of a heel generated in the ventral waist region, and FIG. 5B is a diagram illustrating a cross section in a thickness direction of the heel generated in the first region and the heel generated in the second region. . It is explanatory drawing of the application | coating area | region of the adhesive agent around a cut part. It is a top view of the deployment state of the diaper of 2nd Embodiment. It is a figure explaining the conditions of the sample which measured the stretching force. It is a figure explaining the measurement result of elastic force.

  At least the following matters will become apparent from the description of the present specification and the accompanying drawings.

An absorptive body having an absorptive core having a longitudinal direction and a transverse direction intersecting the longitudinal direction and absorbing excrement; a dorsal waist part located on one end side of the absorptive body; A disposable diaper comprising a ventral waistline part located on the other end side of the absorbent main body, the central part of the ventral waistline part in the lateral direction, and the ventral waistline part in the longitudinal direction A cut portion is provided at the upper end, and a plurality of elastic members along the lateral direction are disposed on the ventral waist portion, and between the lower end of the cut portion and the upper end of the absorbent core in the longitudinal direction. A first region along the lateral direction, and a second region located on the lower side in the longitudinal direction than the first region and along the lateral direction, and the elastic member contracts by the contraction A wrinkle occurs in the first region and the second region, and the lateral direction In the range including at least the position where the cut portion is provided, the number of wrinkles generated in the first region is smaller than the number of wrinkles generated in the second region. Disposable diapers.
According to such a disposable diaper, since the abdominal side waistline part (for example, sheet | seat) does not concentrate in the 1st area | region of the cut part vicinity, a 1st area | region hits a wearer's skin softly and is comfortable. On the other hand, in the second region in the vicinity of the absorbent core, the ventral side waist portion is dense and it is difficult to make a gap.

In such a disposable diaper, in the range including at least the position where the cut portion is provided in the lateral direction, the height of the unevenness of the heel of the first region in the thickness direction of the ventral waist part is The disposable diaper characterized by being larger than the height of the irregularities of the ridges in the second region in the thickness direction.
According to such a disposable diaper, the number of wrinkles in the first region can be reduced as compared with the number of wrinkles in the second region. Moreover, the clearance gap of a 1st area | region becomes large and wearing comfort improves. On the other hand, the gap in the second region is reduced, and excrement leakage can be suppressed.

In such a disposable diaper, the elastic member is disposed at least in the second region, and the elastic force per unit width in the longitudinal direction when worn is greater than that in the second region. A disposable diaper characterized in that one region is smaller.
According to such a disposable diaper, the number of wrinkles in the first region can be reduced as compared with the number of wrinkles in the second region.

In this disposable diaper, at least one of the number of the elastic members arranged, the elastic force of the elastic members arranged, and the expansion ratio of the elastic members is different between the first region and the second region. A disposable diaper characterized by that.
According to such a disposable diaper, the stretching force of the first region can be made smaller than the stretching force of the second region.

Such a disposable diaper, wherein the elastic member is not disposed in the first region.
According to such a disposable diaper, since the first region is not further concentrated, the wearer's skin is softly touched and the wearing comfort is improved.

In this disposable diaper, the absorbent main body includes at least a liquid-permeable sheet and a liquid-impermeable sheet, and the ventral waist part includes at least a sheet to which the elastic member is fixed, The disposable diaper characterized in that the number of sheets laminated in the region is smaller than the number of sheets laminated in the second region.
According to such a disposable diaper, since the rigidity of a 1st area | region becomes low, a 1st area | region hits a wearer's skin softly and comfortableness is good. On the other hand, since there are many sheets in the second region and there is also a liquid-impermeable sheet, leakage of excrement can be suppressed.

This disposable diaper is characterized in that the upper end of the absorbent main body in the longitudinal direction is a boundary between the first region and the second region.
According to such a disposable diaper, the number of sheets stacked in the first region can be reduced as compared with the number of sheets stacked in the second region.

In such a disposable diaper, the outer portions of the cut portion in the lateral direction in the abdominal waistline portion are more elastic in wearing than in the second region and in the longitudinal direction. Disposable diapers characterized by low stretch force per unit width.
According to such a disposable diaper, the upper end part of the abdominal side waist part does not gather closely, and it touches a wearer's skin softly and is comfortable to wear.

In this disposable diaper, in the ventral waist part, the elastic member is disposed between a pair of sheets, and the pair of sheets and the elastic member are bonded with an adhesive, and the belly waist part In the portion, the adhesive for joining the pair of sheets and the pair of sheets and the elastic member are joined to at least a part of the edge portion along the outer edge of the cut portion. A disposable diaper characterized in that at least one of the adhesives is not provided.
According to such a disposable diaper, it can suppress that the edge part along the outer edge of a cut part becomes hard with an adhesive agent. Therefore, the edge part of a cut part touches a wearer's skin softly, and it is comfortable to wear. Moreover, since the edge part by the side of the cut part of an elastic member shrink | contracts, it can prevent that an elastic member is exposed in a cut part.

In this disposable diaper, the elastic member disposed in the lower region in the vertical direction than the second region is located from one end to the other end of the ventral waist portion in the lateral direction. A disposable diaper comprising a discontinuous portion on the absorbent core.
According to such a disposable diaper, it can prevent that an absorptive core contracts, an absorptive core can be stuck to a wearer's body, and a leak of excrement can be suppressed.

In this disposable diaper, the elastic member is disposed on both sides of the cut portion in the lateral direction, and the width of the cut portion in the lateral direction is smaller than the maximum width of the absorbent core. Disposable diapers.
According to such a disposable diaper, it is possible to prevent the disposable diaper from hitting a wet navel of a newborn. Moreover, the length of the elastic member arrange | positioned at the both sides of a cut part can be ensured by not spreading the width of a cut part more than necessary, and a ventral waist part can be fitted to a wearer's waist part.

  Hereinafter, as a disposable diaper according to the present invention, an embodiment will be described by taking a pants-type disposable diaper mainly for newborns as an example.

=== First Embodiment ===
<Basic configuration of diaper 1>
FIG. 1 is a perspective view of a disposable diaper 1 (hereinafter referred to as a diaper). FIG. 2 is a plan view of the unfolded diaper 1. FIG. 3 is a cross-sectional view of the diaper 1 in the unfolded state at the center in the lateral direction. In addition, FIG. 2 is a development view in a state where the elastic member of the diaper 1 is extended to such an extent that the wrinkles generated in the diaper 1 cannot be visually recognized. The diaper 1 has a vertical direction, a horizontal direction, and a thickness direction that intersect each other. Further, the diaper 1 is a so-called three-piece type, which is applied to the wearer's crotch part and absorbs excrement such as urine, and a back waistline part 20 that covers the back side part of the wearer. And an abdomen waist part 30 covering the abdomen side of the wearer.

  2, the longitudinal directions of the back waistline portion 20 and the abdominal waistline portion 30 are along the lateral direction of the diaper 1, and the backside waistline portion 20 and the abdominal waistline portion 30 are in the longitudinal direction of the diaper 1. The absorptive main body 10 is spanned between both parts 20 and 30 in the state arrange | positioned at intervals. And the one end part in the longitudinal direction of the absorptive main body 10 is located in the center part of the back side waistline part 20 in the horizontal direction, and in the longitudinal direction of the absorptive main body 10 in the center part of the ventral side waistline part 30 in the lateral direction. The other end is located. Moreover, the back waistline part 20 and the abdominal waistline part 30 are joined to the non-skin side surface of the absorbent main body 10 in the thickness direction. From this state, the absorbent main body 10 is folded in half at the center in the longitudinal direction so that the upper end 20a of the back side waistline portion 20 and the upper end 30a of the abdominal side waistline portion 30 in the vertical direction are aligned, and the back side waistline portion 20 And the ventral waist part 30 are joined, and the diaper 1 becomes a pants type. Specifically, both end portions 20b of the back side waistline portion 20 and both end portions 30b of the abdominal side waistline portion 30 in the lateral direction are joined. Thus, the diaper 1 is formed with a waist opening 1a and a pair of leg openings 1b.

  The absorbent main body 10 includes a liquid-permeable top sheet 11 (for example, non-woven fabric), an absorber 12, a liquid-impermeable back sheet 13 (for example, a sheet made of polyethylene or polypropylene), and an exterior sheet 14 (for example, non-woven fabric). And a pair of side sheets 15 (for example, a liquid-impermeable nonwoven fabric).

  The absorbent body 12 includes an absorbent core 121 formed by laminating a liquid absorbent material (for example, pulp fiber or superabsorbent polymer), and a liquid-permeable core wrap (not shown, for example, non-woven fabric or tissue) that covers the absorbent core 121. ). The absorbent core 121 may not be covered with the core wrap. Moreover, the absorptive core 121 of this embodiment is a substantially hourglass shape in plan view, and the lateral width W1 is maximum at the end 121a of the absorptive core 121 in the vertical direction.

  The pair of side sheets 15 are provided on both sides of the absorbent main body 10 in the lateral direction. An elastic member 151 (for example, a rubber thread or an elastic sheet) that expands and contracts in the vertical direction is provided at the outer end of the side sheet 15 in the horizontal direction. Accordingly, both side portions of the absorbent main body 10 in the lateral direction constitute a so-called leg gather LG and fit around the wearer's leg. On the other hand, the inner end portion of the side seat 15 in the lateral direction is folded outward in the lateral direction, and an elastic member (not shown) that expands and contracts in the vertical direction is provided in the folded portion. Therefore, the inner side edge part of the side seat | sheet 15 in the horizontal direction comprises what is called a three-dimensional gather LSG which can stand on the wearer's skin side in the thickness direction. The excrement is blocked by the three-dimensional gather LSG.

  The back waistline portion 20 has a rectangular shape in plan view, an inner layer sheet 21 (for example, non-woven fabric) positioned on the skin side in the thickness direction, an outer layer sheet 22 (for example, non-woven fabric) positioned on the non-skin side, and in the lateral direction. And a plurality of elastic members 23 that are arranged along the side and extend in the lateral direction. The plurality of elastic members 23 are arranged between the inner layer sheet 21 and the outer layer sheet 22 with an interval in the vertical direction, and are fixed to the inner layer sheet 21 and the outer layer sheet 22 in an expanded state. In the present embodiment, a rubber thread is illustrated as the elastic member 23, and the elastic member 23 is hereinafter also referred to as a back-side rubber thread 23.

  The ventral waist part 30 has a rectangular shape in plan view, an inner layer sheet 31 (for example, non-woven fabric) positioned on the skin side in the thickness direction, an outer layer sheet 32 (for example, non-woven fabric) positioned on the non-skin side, and in the lateral direction. And a plurality of elastic members 33 that extend along the horizontal direction. The plurality of elastic members 33 are arranged between the inner layer sheet 31 and the outer layer sheet 32 with a space therebetween in the vertical direction, and are fixed to the inner layer sheet 31 and the outer layer sheet 32 in an expanded state. In the present embodiment, a rubber thread is illustrated as the elastic member 33. Hereinafter, the elastic member 33 is also referred to as a ventral side rubber thread 33.

  The diaper 1 fits around the waist of the wearer by the back side rubber thread 23 and the ventral side rubber thread 33. The elastic members 23 and 33 disposed in the back waistline portion 20 and the abdominal waistline portion 30 are not limited to thread rubber, and may be, for example, thread-like polyurethane stretchable fibers, or may be sheet-like elastic members. .

<Cut part 40>
The baby's navel is moist. In addition, a clip may be attached to the navel of a newborn to prevent bleeding. Therefore, in the diaper 1, a cut portion 40 (notch) is provided at the upper end 30a of the ventral side waistline portion 30 in the vertical direction, which is the central portion of the ventral side waistline portion 30 in the horizontal direction. The shape of the cut portion 40 of the present embodiment is an arc shape that protrudes downward. The cut part 40 can prevent the clip attached to the wearer's navel or navel from hitting the diaper 1. In addition, it is possible to avoid the occurrence of a situation in which the wearer (mother or the like) of the diaper 1 does not raise the diaper 1 sufficiently up because the diaper 1 is in contact with the navel or the like, and leakage of excrement can be prevented.

  The width W2 (for example, 85 mm) of the cut portion 40 in the lateral direction is smaller than the maximum width W1 (for example, 120 mm) of the absorbent core 121. In addition, abdominal thread rubber 33 (hereinafter also referred to as a cut-part-around thread rubber 33a) is disposed on both sides of the cut part 40 in the lateral direction. Therefore, the width of the cut portion 40 is not unnecessarily wide, and the length of the cut portion surrounding thread rubber 33a can be secured. Therefore, the diaper 1 (ventral side waist part 30) fits a wearer's waist. In addition, the width of the cut part 40 in the lateral direction and the maximum width of the absorbent core 121 are in a state where the ventral waist part 30 is extended, that is, to the extent that wrinkles generated in the ventral waist part 30 are not visible. It may be measured in a state where the ventral waist part 30 is extended.

  Moreover, the depth (length of the vertical direction) of the cut part 40 shall be about 15 mm, and the diaper 1 fits a wearer's waist circumference by not making it deeper than necessary. In addition, the cut portion 40 is not limited to an arc shape, but may be a rectangular shape, for example. In the case of the cut portion 40 formed in a straight line in this way, the design becomes easy. Further, a straight slit having a predetermined length in the vertical direction may be used as the cut portion 40. In this case, the manufacture is facilitated, and a cut-off portion does not occur during the manufacture. Since the slit expands in the lateral direction when worn, the wearer's navel and clip can be prevented from hitting the diaper 1. Further, the back waistline portion 20 is not provided with a cut portion.

  The ventral waist part 30 includes a first region 34 and a second region 35. The first region 34 is a region from the position of the lower end 40 b of the cut portion 40 in the vertical direction to the position of the upper end 10 a of the absorbent main body 10. The second region 35 is a region from the position of the upper end 10 a of the absorbent main body 10 to the position of the upper end 121 a of the absorbent core 121 in the vertical direction. Moreover, both the 1st area | region 34 and the 2nd area | region 35 are made into the area | region extended along the horizontal direction between the both ends 30b of the ventral side waist part 30 in the horizontal direction.

<Ventral rubber thread 33>
FIG. 4 is a view showing the diameter and expansion ratio of the ventral side rubber thread 33. The ventral waist part 30 has twelve ventral rubber threads 33. Of the twelve ventral side rubber threads 33, two arranged on both sides of the cut part 40 in the lateral direction are called cut part surrounding thread rubbers 33a, and one arranged in the first area 34 is the first area. Called the thread rubber 33b, the three disposed in the second region 35 are referred to as the second region thread rubber 33c, and the two disposed below the second region thread rubber 33c are the upper absorber surrounding thread rubber 33d. The four pieces arranged below the upper absorbent body thread rubber 33d are referred to as lower absorbent body thread rubber 33e.

  The cut-around thread rubber 33a includes a portion from one end 30b in the lateral direction of the ventral waist part 30 to the other end in the lateral direction of the cut part 40, and an end part in the lateral direction of the cut part 40. To the end 30b on the other side in the lateral direction of the ventral waist part 30. The diameter of the cut-around thread rubber 33a is 470 dtex, and the expansion ratio is 2.6. The expansion ratio (n times) of the rubber thread (elastic member) is the length A of the rubber thread fixed to the sheet in the extended state, and the length B of the rubber thread in the non-extended state (natural state). (N = A / B).

  The first region thread rubber 33b and the second region thread rubber 33c extend between both end portions 30b of the ventral trunk periphery 30 in the lateral direction, and do not include discontinuous portions. The diameter of the first region rubber thread 33b is 470 dtex, and the expansion ratio is 3.2. The diameter of the second region rubber thread 33c is 940 dtex, and the expansion ratio is 3.2.

  The upper absorbent body thread rubber 33d has a diameter of 940 dtex and an expansion ratio of 3.6. The diameter of the lower absorbent body thread rubber 33e is 470 dtex, and the expansion ratio is 3.4. Further, the upper absorbent body thread rubber 33d and the lower absorbent body thread rubber 33e extend from one end 30b in the lateral direction of the ventral waist part 30 to the other end in the lateral direction of the absorbent core 121. And a portion from the end portion on one side in the lateral direction of the absorbent core 121 to the end portion 30b on the other side in the lateral direction of the abdominal trunk side portion 30. That is, the upper absorbent body surrounding thread rubber 33d and the lower absorbent body surrounding thread rubber 33e arranged in the lower region in the longitudinal direction than the second region 35 are both end portions of the ventral waist part 30 in the lateral direction. While located from one side of 30b to the other, it has a discontinuous part on absorptive core 121. Thus, by making the rubber thread 33 discontinuous on the absorbent core 121, the absorbent core 121 can be prevented from shrinking, and the absorbent core 121 can be in close contact with the wearer's body without gaps. Can do. Therefore, the leakage of excrement can be suppressed.

  As described above, the cut portion surrounding thread rubber 33a, the upper absorbent body surrounding thread rubber 33d, and the lower absorbent body surrounding thread rubber 33e include discontinuous portions. Therefore, it is preferable that the first region rubber thread 33b and the second region thread rubber 33c extend continuously between both end portions 30b of the ventral waist part 30 in the lateral direction so as not to include discontinuous portions. By doing so, the center part of the abdominal side waist part 30 in a horizontal direction can be stuck to a wearer's body, and the leakage of excrement can be suppressed.

<A spear that appears in Diaper 1>
FIG. 5A is an explanatory view of the heel generated in the ventral waist part 30, and FIG. 5B is a cross-section in the thickness direction of the ridge 341 generated in the first region 34 and the ridge 351 generated in the second region 35. It is a figure explaining. As described above, the ventral waist part 30 includes the first region 34 along the lateral direction and the first region 34 between the lower end 40b of the cut portion 40 and the upper end 121a of the absorbent core 121 in the vertical direction. Is also provided on the lower side in the vertical direction and the second region 35 along the horizontal direction. And the wrinkle has arisen in the 1st field 34 and the 2nd field 35 by contraction of the stomach side rubber thread 33 arranged in the stomach side waist part 30, and at least the position where the cut part 40 was provided in the transverse direction In the included range, the number of ridges 341 generated in the first region 34 is smaller than the number of ridges 351 generated in the second region 35.

  Therefore, in the 1st field 34 near cut part 40, since inner layer sheet 31 and outer layer sheet 32 which constitute ventral side waist part 30 do not gather closely, and 1st field 34 touches a wearer's skin softly, diaper 1 Wearing comfort is improved. On the other hand, in the second region 35 in the vicinity of the absorbent core 121, the inner layer sheet 31 and the outer layer sheet 32 are densely packed and it is difficult to leave a gap, so that leakage of excrement can be suppressed. Since excrement is blocked in the second region 35, there is no fear of excrement leakage even if there is a gap in the first region 34 compared to the second region 35. Moreover, in the diaper simply provided with the cut portion, the region for suppressing the leakage of excrement, that is, the region having a large number of folds and closely contacting the wearer's body is located at the outer edge 40a (cut end) of the cut portion 40. It will be. If it does so, the hard area | region where the sheet | seat concentrated will hit the delicate skin around the umbilicus, and will injure skin. Therefore, like the diaper 1 of the present embodiment, it is preferable to provide the first region 34 with a small number of wrinkles between the lower end 40b of the cut portion 40 and the second region 35. By doing so, since the soft 1st area | region 34 where a sheet | seat is not crowded is located in the outer edge 40a of the cut part 40, it can prevent damaging a wearer's skin.

  In addition, as a range including at least the position where the cut part 40 is provided in the horizontal direction, the width from the position of the end 40c on one side of the cut part 40 in the horizontal direction to the position of the end 40d on the other side is W2. The range which is can be illustrated. However, the present invention is not limited to this, and may be a range including a position on the outer side in the lateral direction from the cut portion 40 or a range including only a part of the position where the cut portion 40 is provided. In addition, the number of ridges 341 and 351 generated in the first region 34 and the second region 35 is, for example, that the diaper 1 is placed flat or the diaper 1 is stretched in the lateral direction so that the heel does not disappear. It can measure by counting the number of convex parts and concave parts. For example, when the diaper 1 is viewed from the skin side, a portion protruding to the skin side becomes a convex portion, and a portion protruding to the non-skin side becomes a concave portion.

  Moreover, in the diaper 1, each length of the 1st area | region 34 and the 2nd area | region 35 in a horizontal direction is equal. Therefore, as shown in FIG. 5B, in the range including at least the position where the cut portion 40 is provided in the lateral direction, the height of the unevenness of the ridge 341 in the first region 34 in the thickness direction of the ventral waist part 30 However, it is larger than the height of the unevenness of the ridge 351 in the second region 35. Therefore, the clearance gap of the 1st area | region 34 becomes larger, and since the 1st area | region 34 touches a wearer's skin softly, the wearing comfort of the diaper 1 improves. On the other hand, the gap between the second regions 35 becomes smaller, and excrement leakage can be suppressed. In other words, by increasing the height of the unevenness of the ridges 341 in the first region 34 compared to the height of the unevenness of the ridges 351 in the second region 35, the number of the ridges 341 in the first region 34 is increased. The number of ridges 351 in the two regions 35 can be reduced.

  It should be noted that the height of the unevenness of the heel is, for example, that the diaper 1 is placed flat or the diaper 1 is laterally extended to such an extent that the heel does not disappear. It is obtained by measuring the length in the thickness direction to the apex. Moreover, you may compare all the ridges 341 of the 1st area | region 34, and all the ridges 351 of the 2nd area | region 35 among the ranges including at least the position where the cut part 40 was provided in the horizontal direction, and one part You can just compare the cocoons. Moreover, the height of the unevenness | corrugations of several ridges may be compared by an average value, and may be compared separately.

  Further, it is preferable that the width of the ridge 341 in the first region 34 (width of the convex portion or the concave portion) in the lateral direction is larger than the width of the ridge 351 in the second region 35 together with the height of the ridge irregularities. By doing so, the convex part of the collar 341 in the first region 34 can be in contact with the wearer's body by the surface, and the convex part of the collar 341 can be prevented from locally contacting the wearer's body. Therefore, the wearing comfort of the diaper 1 is improved.

  In addition, as shown in FIG. 4, the expansion ratio of the first region thread rubber 33b is equal to the expansion ratio of the second region thread rubber 33c, but the number of first region thread rubbers 33b is equal to the number of second region thread rubbers 33c. The diameter (stretching force) of the first region rubber thread 33b is smaller than that of the second region thread rubber 33c. Therefore, the stretching force when the diaper 1 is worn in the lateral direction, and the stretching force per unit width in the longitudinal direction is smaller in the first region 34 than in the second region 35, and The number of ridges 341 can be reduced as compared with the number of ridges 351 in the second region 35.

  However, the present invention is not limited to the above, and the first region 34 and the second region 35 are provided on the ventral side so that the stretching force per unit width in the vertical direction is smaller in the first region 34 than in the second region 35. What is necessary is just to make at least one of the arrangement | positioning number of the thread rubber 33, the diameter (stretching force) of the arrange | positioned belly side rubber thread 33, and the expansion | extension magnification of the belly side thread rubber 33 different. Specifically, the number of the first region abdominal thread rubber 33b is less than the number of the second region abdominal thread rubber 33b, or the diameter (stretching force) of the first region abdominal thread rubber 33b is set to the first. The diameter (stretching force) of the second region abdominal thread rubber 33c may be smaller, or the expansion ratio of the first region abdominal thread rubber 33b may be lower than the expansion ratio of the second region abdominal thread rubber 33c.

  In addition, as a stretching force at the time of wearing, the stretching force when extending the waistline opening 1a of the diaper 1 to the average waistline (average value of the assumed waistline) of the newborn baby who is the wearing object of the diaper 1 can be illustrated. That is, the stretching force of the first region 34 and the stretching force of the second region 35 when compared with the circumference of the waist opening 1a of the diaper 1 that is in a natural state (non-stretched state) are compared. Good.

  Also, as shown in FIG. 4, the cut-around thread rubber 33a has a smaller number, a smaller diameter (stretching force), and a lower expansion ratio than the second region thread rubber 33c. Therefore, the outer side portions 36 of the cut portion 40 in the lateral direction (hereinafter referred to as both side portions of the cut portion) of the abdominal waistline portion 30 are worn in the lateral direction of the diaper 1 compared to the second region 35. The stretching force per unit width in the vertical direction is small. Therefore, the number of wrinkles generated on both side portions 36 of the cut portion is smaller than the number of wrinkles generated in the second region 35. Thus, in the predetermined range in the lateral direction of the diaper 1 (for example, the range from the lateral one end of the abdominal waistline portion 30 to the lateral one end of the cut portion 40), both side portions 36 of the cut portion. It is preferable that the number of wrinkles generated in is smaller than the number of wrinkles generated in the second region 35. By doing so, also in the both side parts 36 of a cut part, since the sheet | seat does not concentrate like the 1st area | region 34 and touches a wearer's skin softly, the wearing comfort of the diaper 1 improves. Moreover, since the upper end 30a (cut end) of the abdominal side waist part 30 becomes soft, it can prevent damaging a wearer's skin.

  It should be noted that the number of the abdominal thread rubbers 33 disposed, the expansion / contraction force (diameter) of the disposed abdominal thread rubbers 33, and the expansion ratio of the abdominal thread rubber 33 are determined by the both side portions 36 and the second region 35 of the cut portion. It is preferable to make at least one of them different so that the stretching force of the side portions 36 of the cut portion is smaller than the stretching force of the second region 35.

  Moreover, it is preferable that the height of the unevenness of the ridges of the side portions 36 of the cut portion in the thickness direction of the ventral waist part 30 is larger than the height of the ridges of the ridges 351 of the second region 35. By doing so, the clearance gap between the both side parts 36 of a cut part becomes larger, and since the both side parts 36 of a cut part touch a wearer's skin softly, the wearing comfort of the diaper 1 improves.

  As described above, the diaper 1 is worn by reducing the expansion / contraction force of the first region 34 and both side portions 36 of the cut portion, that is, the upper end portion of the abdominal waistline portion 30 as compared with the expansion / contraction force of the second region 35. When it is made to wear, the upper end part of the abdominal side waist part 30 becomes easy to expand, and the diaper 1 can be put on smoothly. Moreover, when the infant whose waistline is full wears the diaper 1, it can prevent that a waistline is tightened too much.

  Furthermore, in the diaper 1, the upper end 10 a of the absorbent main body 10 in the vertical direction does not reach the lower end 40 b of the cut portion 40 as shown in FIGS. 2 and 3. The upper end 10 a of the absorbent main body 10 serves as a boundary between the first region 34 and the second region 35. Therefore, the number of sheets stacked in the thickness direction in the first region 34 is two (the inner layer sheet 31 and the outer layer sheet 32 of the ventral trunk periphery 30), and the second region 35 is stacked in the thickness direction. The number of sheets is five (the inner layer sheet 31 and the outer layer sheet 32 of the ventral trunk periphery 30, the liquid permeable sheet 11, the liquid impermeable sheet 13, and the outer sheet 14 of the absorbent main body 10). That is, the number of sheets stacked in the first region 34 is smaller than the number of sheets stacked in the second region 35.

  Therefore, since the rigidity of the first region 34 is lowered, the first region 34 softly touches the wearer's skin and the wearing comfort is improved. Moreover, it can prevent that a wearer's skin is damaged by the outer edge 40a (1st area | region 34) of the cut part 40. FIG. On the other hand, since many sheets exist in the second region 35 and the liquid-impermeable back sheet 13 also exists, leakage of excrement can be suppressed.

  FIG. 6 is an explanatory diagram of an adhesive application area around the cut portion 40. In the ventral waist part 30, an abdominal thread rubber 33 is disposed between the inner layer sheet 31 and the outer layer sheet 32, and the inner layer sheet 31, the outer layer sheet 32, and the abdominal thread rubber 33 are joined together with an adhesive. However, the adhesive is not applied to the edge portion 41 along the outer edge 40a of the cut portion 40. Specifically, the edge 41 of the cut portion 40 is not provided with an adhesive that joins the inner layer sheet 31 and the outer layer sheet 32 (a pair of sheets), and the inner layer sheet 31 and the outer layer sheet 32 (a pair of sheets). And an adhesive for joining the ventral rubber thread 33 is not provided. By doing so, it prevents that the edge part 41 of the cut part 40 becomes hard with an adhesive agent, and since the edge part 41 of the cut part 40 touches a wearer's skin softly, wearing comfort improves. In addition, when the width W2 of the cut part 40 is set to 85 mm, for example, the width of the edge part 41 may be set to a range of 2 mm to 15 mm.

  Further, the cut portion 40 is cut after the cut portion surrounding thread rubber 33a is fixed to the inner layer sheet 31 and the outer layer sheet 32 in a state where the end portion 30b of the ventral waist portion 30 in the lateral direction continuously extends. Suppose that In this case, since the adhesive is not applied to the edge 41 of the cut part 40, the end of the cut part surrounding thread rubber 33a on the cut part 40 side can contract to the edge 41 of the cut part 40. Exposure from 40 can be prevented. Therefore, the external appearance of the diaper 1 can be improved and it can prevent that the edge part of the thread rubber 33a around a cut part contacts a wearer's skin.

  In addition, an adhesive is provided in a part of the edge 41 of the cut portion 40, an adhesive that joins a pair of sheets, and an adhesive that joins the pair of sheets and the abdominal thread rubber 33. One may be provided at the edge 41 of the cut portion 40. In addition, the ventral waist part 30 of the present embodiment includes the inner layer sheet 31 and the outer layer sheet 32, but is not limited thereto, and for example, a predetermined color or image is added between the inner layer sheet 31 and the outer layer sheet 32. A design sheet may be provided. In this case, the inner layer sheet 31 or the outer layer sheet 32 and the design sheet form a pair of sheets. Further, it is preferable that the adhesive between the sheets without the ventral thread rubber 33 interposed therebetween is not provided on the edge 41 of the cut portion 40.

=== Second Embodiment ===
FIG. 7 is a plan view of the unfolded state of the diaper 1 of the second embodiment. In the diaper 1 of the second embodiment, the abdominal thread rubber 33 is not disposed in the first region 34, and four abdominal thread rubbers 33 (second region thread rubbers 33 c) are disposed in the second region 35. Since the structural requirements other than the arrangement of the ventral side rubber thread 33 are the same as those in the first embodiment, the description thereof is omitted. In addition, FIG. 7 is a development view in a state where the elastic member of the diaper 1 is extended to the extent that the wrinkles generated in the diaper 1 cannot be visually recognized.

  Even if the ventral side rubber thread 33 is not disposed in the first region 34, the first region 34 contracts due to the contraction of the thread rubber 33 a around the cut portion and the second region thread rubber 33 c, and wrinkles occur in the first region 34. However, when the ventral side rubber thread 33 is not disposed in the first region 34, the number of wrinkles generated in the first region 34 is reduced as compared with the case where the ventral side rubber rubber 33 is disposed in the first region 34. Therefore, the inner layer sheet 31 and the outer layer sheet 32 constituting the ventral waist part 30 are not more densely packed, and the first region 34 softly touches the wearer's skin, so that the wearing comfort of the diaper 1 is improved.

  Further, in the diaper 1 of the second embodiment, the stretching force at the time of wearing, and the stretching force per unit width in the vertical direction is zero in the first region 34. Therefore, the stretching force in the first region 34 is smaller than the stretching force in the second region 35.

  Further, the ventral side rubber thread 33 does not have to be disposed in the first region 34, and the ventral side rubber thread 33 may not be disposed on both side portions 36 of the cut portion. Also in this case, wrinkles occur in the first region 34 and both side portions 36 of the cut portion due to the contraction of the second region rubber thread 33c. And the number of the wrinkles which arise in the 1st area | region 34 and the both sides 36 of a cut part becomes smaller. Therefore, the 1st field 34 located around a wearer's navel and the both sides 36 of a cut part touch a wearer's skin softer. In addition, the form by which the abdominal side rubber thread 33 is arrange | positioned in the 1st area | region 34, and the abdominal side rubber thread 33 is not arrange | positioned at the both sides 36 of a cut part may be sufficient. Also in this case, the number of wrinkles generated on the first region 34 and both side portions 36 of the cut portion is reduced, and the first region 34 and both side portions 36 of the cut portion are more softly applied to the wearer's skin.

=== Measuring method of stretching force ===
FIG. 8 is a diagram for explaining the conditions of a sample for measuring the stretching force, and FIG. 9 is a diagram for explaining the measurement result of the stretching force. Hereinafter, the measuring method and the actual measurement result of the expansion / contraction force (lateral expansion / contraction force of the diaper 1) of the 1st area | region 34 and the 2nd area | region 35 are demonstrated. Here, a measurement method using a tensile tester is illustrated, but other measurement methods may be used. Further, the stretching force of the both side portions 36 of the cut portion may be measured in the same manner and compared with the stretching force of the second region 35.

  First, the sample 1 (ventral side waistline portion 30) is cut out from the first region 34 of the diaper 1 to be measured along the lateral direction of the diaper 1 (stretching direction of the ventral side rubber thread 33), and the diaper is extracted from the second region 35. Sample 2 (ventral side waist part 30 and absorbent main body 10) is cut out along the horizontal direction 1. In the sample 1 exemplified here, the number of the ventral side rubber threads 33 arranged is one, the diameter of the arranged ventral side rubber thread 33 is 470 dtex, the expansion ratio is 2.3, and the vertical width of the diaper 1 is 10 mm. In the sample 2, the number of the ventral side rubber threads 33 arranged is three, the diameter of the arranged ventral side rubber threads 33 is 470 dtex, the expansion ratio is 2.3, and the vertical width of the diaper 1 is 20 mm.

  Next, both ends of the sample 1 or the sample 2 in the pulling direction (lateral direction of the diaper 1) are sandwiched between the upper and lower chucks of the tensile testing machine. Here, the initial chuck-to-chuck distance in the pulling direction, that is, the initial dimension is 117.5 mm. Therefore, the cut-out width of the samples 1 and 2 in the lateral direction of the diaper 1 is set to 117.5 mm or more. Further, it is assumed that the measurement value of the tensile tester is set to zero when the samples 1 and 2 are sandwiched by the upper chuck, and the setting is not performed when the samples 1 and 2 are sandwiched by the lower chuck.

  Next, while separating the chuck distance from the initial dimension (117.5 mm) to a length (247.5 mm) obtained by adding about 110% of the initial dimension (130 mm) to the initial dimension, that is, Samples 1 and 2 The tensile stress (N) at each length is measured while stretching. The tensile speed is, for example, 100 mm / min. Then, the measurement result (N) is converted into a value per unit width (10 mm) in the longitudinal direction of the diaper 1. The values thus calculated are defined as the stretching force of the first region 34 per unit width in the longitudinal direction of the diaper 1 and the stretching force (N / 10 mm) of the second region 35.

  As described above, the stretching force at the time of wearing can be exemplified by the stretching force when stretched by about 30% with respect to the circumferential length of the waistline opening 1a of the diaper 1 in a natural state. Therefore, in this measurement method, when the distance between the chucks is the initial dimension (117.5 mm), it is assumed that the diaper 1 is in a natural state, and when the distance between the chucks is about 30% away from the initial dimension (152. The measurement results of 5 mm≈117.5 × 1.3) may be compared. In the measurement result of FIG. 9, the stretching force per unit width in the vertical direction when the distance between chucks is 152.5 mm is 0.0679 (N / 10 mm) in the first region 34 and 0 in the second region 35. 0.085 (N / 10 mm). In other words, the result is that the stretching force of the first region 34 is smaller than the stretching force of the second region 35.

  Here, the measurement results when separating the distance between chucks from the initial dimensions (measurement results when extending) are compared, but not limited to this, when returning to the initial dimensions from the state where the distance between chucks is maximized. The measurement result (measurement result during contraction) may be compared, or the average value of the measurement result during expansion and the measurement result during contraction may be measured. Further, comparison may be made with measurement results other than when the distance between chucks is about 30% away from the initial dimension.

=== Other Embodiments ===
The above embodiment is for facilitating the understanding of the present invention, and is not intended to limit the present invention. The present invention can be modified and improved without departing from the gist thereof, and it goes without saying that the present invention includes equivalents thereof.

  In the above embodiment, the first region 34 and the second region 35 differ in both the conditions (number of arrangement, diameter, expansion ratio) of the ventral side rubber thread 33 and the number of stacked sheets, but only one of them differs. Diaper 1 is also acceptable. Even when only the number of stacked sheets is different between the first region 34 and the second region 35, the stretching force at the time of wearing and the stretching force per unit width in the longitudinal direction of the diaper 1 is the second region. Compared to 35, the first region 34 tends to be lower.

  Although the underpants type diaper was illustrated as a disposable diaper in the said embodiment, it is not restricted to this, A tape type diaper may be sufficient. Moreover, in the said embodiment, although the diaper divided | segmented into three parts was illustrated, it is not restricted to this, The diaper in which the back side waist part 20 and the abdominal side waist part 30 were formed integrally, the back side waist part 20, A diaper in which the ventral waist part 30 and the absorbent main body 10 are integrally formed may be used. Moreover, in the said embodiment, although the wearing object of the diaper 1 is made into the newborn, it is good also considering adults, such as older infants and elderly people, to wear.

DESCRIPTION OF SYMBOLS 1 Diaper (disposable diaper), 10 absorptive main body, 11 top sheet (liquid permeable sheet), 12 absorber, 121 absorptive core, 13 back sheet (liquid impermeable sheet), 14 exterior sheet, 15 side sheet, 20 back side waistline part, 21 inner layer sheet, 22 outer layer sheet, 23 back side thread rubber, 30 ventral side waist part, 31 inner layer sheet (a pair of sheets), 32 outer layer sheet (a pair of sheets), 33 abdominal side rubber thread ( Elastic member), 33a thread rubber around the cut portion, 33b first area thread rubber, 33c second area thread rubber, 33d upper absorbent body thread rubber, 33e lower absorbent body thread rubber, 34 first area, 341 皺, 35 2nd area, 351 皺, 36 both sides of cut part, 40 cut part, 40a outer edge, 40b lower end, 41 edge part, LG leg gather, LS Standing gathers,

Claims (11)

Having a longitudinal direction and a transverse direction intersecting the longitudinal direction,
An absorbent body with an absorbent core that absorbs excreta;
A back waistline portion located on one end side of the absorbent main body,
A disposable diaper comprising a ventral waist part located on the other end side of the absorbent main body,
A central portion of the ventral waistline portion in the lateral direction, and a cut portion is provided at an upper end of the ventral waistline portion in the longitudinal direction,
A plurality of elastic members along the lateral direction are disposed in the ventral waist part,
Between the lower end of the cut portion in the vertical direction and the upper end of the absorbent core, the first region along the horizontal direction, located below the vertical direction than the first region, and A second region along the lateral direction,
The first region and the second region are wrinkled by the contraction of the elastic member,
In a range including at least the position where the cut portion is provided in the lateral direction, the number of wrinkles generated in the first region is smaller than the number of wrinkles generated in the second region. Disposable diaper featuring. The disposable diaper according to claim 1,
In the range including at least the position where the cut portion is provided in the lateral direction, the height of the irregularities of the ridges in the first region in the thickness direction of the ventral waist portion is the first in the thickness direction. A disposable diaper characterized by being larger than the height of the unevenness of the ridges in two regions. The disposable diaper according to claim 1 or 2,
The elastic member is disposed at least in the second region,
A disposable diaper characterized in that the first region has a smaller stretching force than the second region in terms of stretching force when worn and per unit width in the longitudinal direction. The disposable diaper according to claim 3,
The disposable diaper characterized in that the first region and the second region differ in at least one of the number of arranged elastic members, the elastic force of the arranged elastic members, and the expansion ratio of the elastic members. . The disposable diaper according to claim 4,
A disposable diaper, wherein the elastic member is not disposed in the first region. The disposable diaper according to any one of claims 1 to 5,
The absorbent main body includes at least a liquid-permeable sheet and a liquid-impermeable sheet,
The ventral waist part includes at least a sheet to which the elastic member is fixed,
The disposable diaper characterized in that the number of sheets laminated in the first region is smaller than the number of sheets laminated in the second region. The disposable diaper according to claim 6,
A disposable diaper, wherein an upper end of the absorbent main body in the longitudinal direction is a boundary between the first region and the second region. The disposable diaper according to any one of claims 1 to 7,
Compared with the second region, the portions on the outer sides of the cut portion in the lateral direction in the abdominal waistline portion have a stretching force when worn and a stretching force per unit width in the longitudinal direction. A disposable diaper characterized by its small size. The disposable diaper according to any one of claims 1 to 8,
In the ventral waist part, the elastic member is disposed between a pair of sheets, and the pair of sheets and the elastic member are bonded with an adhesive,
In the ventral waist part, at least a part of the edge part along the outer edge of the cut part has an adhesive for joining the pair of sheets, and the pair of sheets and the elastic member. A disposable diaper characterized in that at least one of the adhesives for joining the two is not provided. The disposable diaper according to any one of claims 1 to 9,
The elastic member disposed in the lower region in the longitudinal direction than the second region is located from one end to the other end of the ventral waistline portion in the lateral direction, on the absorbent core A disposable diaper characterized by comprising a discontinuous portion. The disposable diaper according to any one of claims 1 to 10,
The elastic member is disposed on both sides of the cut portion in the lateral direction,
The disposable diaper characterized in that the width of the cut portion in the lateral direction is smaller than the maximum width of the absorbent core.

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