TWI576098B - Disposable diaper - Google Patents

Description

Disposable diaper

The present invention relates to an absorbent article such as a disposable diaper.

Heretofore, there is known a spread type disposable diaper comprising a front sheet, a back sheet, and an absorbent body interposed between the sheets, and including a belly portion, a crotch portion, and a back portion in the longitudinal direction. a body, and a pair of fastening strips are disposed on the left and right side edges of the back side portion, and the fixing portion of the fastening tape is fixed to the buckle belt disposed on the non-facing surface of the body Formed by wearing on the wearer.

In the unfolded diaper of the unfolded type, the patent document 1 describes the unfolding of the plurality of elastic members in the horizontal direction (the main body width direction) in the waist portion and/or the peripheral portion of the abdomen (back side). Improved technology for disposable diapers. The technique described in Patent Document 1 divides an arrangement region of the plurality of elastic members into a central portion region of the elastic member in the expansion and contraction direction, and an end portion region located at both sides thereof, and in the central portion region The portion is configured in such a manner as to be recognizable from the outside, and is disposed in the end portion portion in such a manner as to be externally recognizable from other designs different from the design of the central portion portion, and more specifically, relative to the center The stretched state of the elastic member in the portion of the portion further emphasizes the stretched state of the elastic member in the end portion portion, thereby visually emphasizing the stretchability and the stretchable range of the elastic member, and the waist portion of the back side portion And/or the flexibility and conformability of the surrounding part of the abdomen, intended to give the wearer an impression that is superior to the actual one.

Prior technical literature Patent literature

Patent Document 1: Japanese Patent Laid-Open Publication No. 2008-183332

In the disposable diaper described in Patent Document 1, the position of the fastening tape is not appropriate in relation to the arrangement area of the plurality of elastic members, so that the waist of the back side portion (the body portion) when worn The end portion in the longitudinal direction of the back side portion and its vicinity are easily curled in the direction away from the skin of the wearer, and the conformability around the waist is poor. Further, if such a curl around the waist occurs, there is a case where the curled portion is caught by the laundry on the diaper, so that the diaper is dropped. Originally, the disposable diaper described in Patent Document 1 is not related to the curl around the waist, and is easily displaced during the wearing process, and there is room for improvement in the conformability around the waist and the anti-offset drop.

The present invention provides a disposable diaper comprising a body having a front sheet, a back sheet, and an absorbent body interposed between the sheets, and including a back side portion, a lower jaw portion, and a ventral portion in the longitudinal direction. And a pair of fastening tapes are disposed on the left and right side edges of the back side portion; wherein, in the disposable diaper, the back side portion includes the absorption of the protruding portion of the absorbent body from the lower jaw portion in the longitudinal direction a body arrangement region and a non-absorbent body arrangement region in which the protrusion portion is not present; and an expansion-contraction portion is provided in the back-side portion over the absorber arrangement region and the non-absorbent body arrangement region, wherein the expansion-contraction portion includes a plurality of elastic members having the same fineness disposed between the front surface sheet and the back surface sheet in an extended state, wherein the elasticized portion forms a lower elasticized portion in the absorbent body arrangement region, and the non-absorbent body disposed region a plurality of elastic members are disposed in the lower elasticized portion and the upper elasticized portion, and the plurality of elastic members constituting the elasticized portion have a fineness of 450 dtex or less, and the elastic member is The expansion/contraction direction is intermittently arranged along the longitudinal direction in accordance with the width direction of the main body orthogonal to the longitudinal direction, and the elastic member disposed in the lower expansion and contraction portion is outside the width direction of the absorber. a portion that extends across the absorber and extends to the other side and overlaps the absorber, and has a non-elastic portion that suppresses the elasticity of the elastic member; and the upper elastic portion is larger than the lower elastic portion The fastening force is small; the fastening tape comprises a belt base joined to the body, and is connected to the belt base and protrudes to the base The belt grip portion is formed on the outer side in the width direction, and the length of the belt grip portion in the longitudinal direction is shorter than the belt base portion; and the plurality of the elastic members constituting the telescopic portion are drawn The elastic member located at the outermost side in the longitudinal direction uniformly intersects the outermost first imaginary straight line extending in the width direction, and draws the most extending in the width direction in correspondence with the elastic member located at the innermost side in the longitudinal direction In the case of the inner first imaginary straight line, the upper end portion of the belt base portion located on the outer side in the longitudinal direction is located in the vicinity of the outermost first imaginary straight line and is located further inward of the longitudinal direction or at the outermost side. The first imaginary straight line is further on the outer side in the longitudinal direction, and the lower end portion of the belt base located on the opposite side to the upper end portion is located at the most The inner first first imaginary straight line is located further outward than the longitudinal direction, or is located on the inner side of the longitudinal direction of the innermost first imaginary straight line; and the main portion of the belt base portion is present in the most In a region sandwiched between the outer first imaginary straight line and the innermost first imaginary straight line; and the elasticity of the outermost and innermost sides in the longitudinal direction of the plurality of elastic members disposed in the lower elasticized portion is drawn In the case where each of the members coincides with the two second imaginary straight lines extending in the width direction, the main portion of the belt grip portion is present in a region sandwiched by the two imaginary straight lines.

The disposable diaper of the present invention is excellent in the conformability around the waist and is not easily displaced during the wearing process.

The present invention relates to a disposable diaper which is excellent in conformability around the waist and which is not easily offset during the wearing process.

Hereinafter, the disposable diaper of the present invention will be described with reference to the drawings in accordance with one preferred embodiment. The diaper 1 of the present embodiment is a so-called unfolded disposable diaper, and includes a front sheet 2, a back sheet 3, and an absorber 4 interposed between the sheets 2 and 3, as shown in Figs. 1 to 3 . The body 10 including the back side portion A, the lower jaw portion B, and the front side portion C in the longitudinal direction is provided with a pair of fastening tapes 6, 6 on the left and right side edges of the back side portion A.

Further, the main body 10 includes a front sheet 2 that forms a liquid-permeable surface facing the skin surface, and a liquid impermeability or water repellency that forms a non-facing surface (hereinafter, collectively referred to as liquid impermeability). Back sheet 3. The liquid retaining body 4 disposed between the two sheets 2 and 3 is formed longitudinally in a direction that is longer in one direction (X direction in the drawing). Any of the front sheet 2, the back sheet 3, and the absorber 4 has a longitudinally long shape in one direction X. The front sheet 2 and the back sheet 3 have a size larger than that of the absorber 4, and extend from the periphery of the absorber 4 to the outside. The front sheet 2 is as shown in FIG. 2, and the dimension in the width direction Y is smaller than the dimension in the width direction Y of the back sheet 3.

The back side portion A is a portion that is disposed on the back side of the wearer when worn, the lower jaw portion B is disposed at a portion of the wearer's lower jaw when worn, and the abdominal portion C is placed on the wearer's belly when worn. The side part. The back side A, the lower jaw B, and the front side C are respectively equivalent to the case where the main body 10 is roughly divided into three in the longitudinal direction X in the unfolded state of the main body 10 (diaper 1) as shown in Fig. 1 . Various regions. The crotch portion B includes a portion opposite to the excretion portion that is disposed opposite to the excretion portion of the wearer when worn, and is located at a central portion in the longitudinal direction X of the main body 10 (diaper 1). The main body 10 (diaper 1) is as shown in Fig. 1, and the side edges of the lower jaw portion B in the longitudinal direction X are curved in an arc shape inward, as shown in Fig. 1, and have a longitudinal direction in plan view. The shape of the hourglass in which the center of X is tapered toward the inside.

In the present specification, the longitudinal direction (the X direction in the drawing) is along the longitudinal direction of the disposable diaper or its constituent members (absorbent body 4, body 10, etc.), and the width direction (the Y direction in the drawing) is The direction in which the length directions are orthogonal. Further, in the skin-facing disposable diaper or a component thereof, the surface facing the wearer's skin side when wearing the disposable diaper, and the non-face-facing disposable diaper or the constituent member thereof are worn-in disposable The diaper faces the side opposite to the skin side (dressing side).

The absorber 4 has a substantially rectangular shape in a plan view, and has a longitudinal direction that coincides with the longitudinal direction X of the main body 10 and is disposed at a central portion in the width direction Y of the main body 10, and extends over the crotch portion B as shown in FIG. The entire length direction X is extended to each of the back side portion A and the front side portion C. The back side portion A includes an absorber arrangement area A1 in which the extension portion 41 of the absorber 4 from the lower jaw portion B exists in the longitudinal direction X, and a non-absorber arrangement area A2 in which the extension portion 41 does not exist. The non-absorber arrangement area A2 is a region between the one end 10a in the longitudinal direction on the side of the back side A side of the main body 10 and the one end 4a in the longitudinal direction on the side of the back side A of the absorber 4 (extension portion 41).

As shown in FIG. 1 to FIG. 3, in the longitudinal direction X of both sides of the main body 10, a pair of three-dimensional pleats and a pair of leg pleats are elastically formed by pleating in an elongated state in the longitudinal direction X. Formed by components. In other words, each of the two sides of the main body 10 in the longitudinal direction X is disposed such that one or a plurality of linear (in the present embodiment, two) three-dimensional pleat forming elastic members 51 are fixed in an extended state. The side sheet 5 at one edge portion forms a pair of three-dimensional pleats at least in the crotch portion B when worn. Further, between the side sheet 5 and the back sheet 3 disposed on the right and left leg portions around the leg portion of the wearer, one or a plurality of (in the present embodiment, two) leg portions are formed in a line shape. The pleat forming elastic member 52 is fixed in an elongated state in the longitudinal direction X, and a pair of leg pleats are formed by the contraction of the elastic member 52 at the leg portion when worn. The pair of side sheets 5, 5, the front sheet 2, the absorber 4, the pleat forming elastic members 51, 52, and the back sheet 3 are joined to each other by a known joining means such as a hot-melt type adhesive.

The left and right side edges of the back side portion A of the body 10 along the longitudinal direction X are provided. A pair of fastening strips 6, 6 are provided. As shown in FIGS. 1 and 3, the fastening tape 6 includes a tape base 60 joined to the body 10 (the sheet material 80 of the stretchable portion 8 described below), and a width connected to the tape base 60 and extending to the body 10. The outer side of the direction Y is provided with a grip portion 61. A fixing portion 61a including a male member of a mechanical hook and loop fastener is attached to the skin-facing surface of the belt grip portion 61. As shown in FIG. 1, the length of the belt grip portion 61 in the longitudinal direction X is shorter than that of the belt base portion 60. In addition, the "length in the longitudinal direction" as used herein means the maximum length in the longitudinal direction X of each of the belt base 60 and the belt grip portion 61.

Further, a buckle 7 that can hold the strap grip portion 61 (fixing portion 61a) is provided on the non-facing surface of the abdominal portion C of the main body 10. The buckle 7 is formed by joining and fixing the female member of the mechanical hook and loop fastener to the non-facing surface of the back sheet 3 by a known joining means (for example, an adhesive or heat sealing), and is detachably The belt grip portion 61 of the fastening tape 6 is fixed.

As shown in FIG. 1, FIG. 3, and FIG. 4, the back side portion A is provided over the absorber arrangement area A1 and the non-absorber arrangement area A2, and is disposed on the front sheet 2 and the back sheet 3 in an extended state. The expansion-contraction portion 8 formed by the plurality of elastic members 81 having the same fineness, the expansion-contraction portion 8 forms the lower expansion-contraction portion 8A1 in the absorbent body arrangement region A1, and the upper expansion-contraction portion 8A2 in the non-absorbent arrangement region A2. A plurality of elastic members 81 are disposed in each of the lower expansion and contraction portion 8A1 and the upper expansion and contraction portion 8A2. The plurality of elastic members 81 are intermittently arranged along the longitudinal direction X of the body 10 such that the expansion and contraction directions thereof coincide with the width direction Y of the body 10. As shown in FIGS. 1 and 4, in the present embodiment, the elasticized portion 8 is provided at the maximum width portion A3 having the largest length in the width direction Y of the back side portion A. As shown in FIG. 1 and FIG. 4, the back side portion in this embodiment The maximum width portion A3 of A includes a rectangular shape in a plan view of the one end 10a in the longitudinal direction on the side of the back side A side of the main body 10.

The plurality of elastic members 81 constituting the elasticized portion 8 have a fineness (thickness) of 450 dtex or less, preferably 150 dtex or more and 450 dtex or less, more preferably 300 dtex or more and 400 dtex or less. By using such a relatively thinner member as the elastic member 81, the diaper 1 can be worn without excessively tightening the waist of the wearer, and it is possible to effectively suppress the leaving of the elastic member constituting the elasticized portion. In the present embodiment, the plurality of elastic members 81 have the same not only the same fineness but also the length (the length in the expansion and contraction direction). When the fineness of the plurality of elastic members 81 is the same as each other, it is advantageous in terms of manufacturing cost and workability as compared with the case where they are different from each other.

In the present embodiment, the elastic portion 8 includes a plurality of elastic members 81 and a sheet material 80 disposed between the front sheet 2 and the back sheet 3, and the plurality of elastic members 81 are stretched. It is fixed to the sheet material 80. More specifically, the elasticized portion 8 of the present embodiment includes two sheet materials 80 and 80 having the same shape (rectangular shape) and the same size, and the plurality of elastic members 81 are known by a hot-melt type adhesive or the like. The joining means is sandwiched and fixed between the two sheets of sheets 80 and 80 which are overlapped in an extended state. The two sheet materials 80 and 80 are joined to the front sheet 2 and the back sheet 3 by a known joining means. The plurality of elastic members 81 extend over the entire length of the sheet material 80 in the width direction Y.

In the present embodiment, the stretchable portion 8 (sheet material 80) is joined to the tape base portion 60 by a known joining means as shown in Fig. 3, and the pair of fastening tapes 6, 6 and the stretchable portion 8 therebetween are interposed therebetween. Integration. Therefore, hold with your fingers, etc. When the belt grip portions 61 of the pair of fastening tapes 6 and 6 are pulled outward in the width direction Y, the elasticized portion 8 is elongated in the width direction Y in conjunction therewith. Both end portions in the width direction Y of the elastic member 81 constituting the elastic portion 8 are overlapped with the belt base portion 60 in plan view as shown in Fig. 1 .

As shown in FIG. 1 , FIG. 3 and FIG. 4 , the elastic member 81 disposed in the lower elasticized portion 8A1 (the portion of the elasticized portion 8 located in the absorbent body arrangement region A1 ) is in the width direction Y of the self-absorbent body 4 The portion on the outer side that extends across the absorber 4 and extends to the other side and overlaps the absorber 4 (the portion opposite to the non-facing surface of the absorber 4) has a tendency to suppress the stretchability of the elastic member 81. Non-elastic portion 82. The elastic member 81 disposed in the lower expansion-contraction portion 8A1 (absorbent body arrangement region A1) can partially suppress the appearance of stretchability, and the non-elastic portion 82 does not expand or contract, but other portions (the outer side of the width direction Y of the absorber 4) Part of it) telescopic. Further, in the elastic member 81 disposed in the lower expansion-contraction portion 8A1 (absorbent body arrangement region A1), the other portion other than the non-elastic portion 82, that is, the non-elastic portion 82 is present on one side in the width direction Y and the other The side portion is such that its inner end portion in the width direction Y overlaps the absorber 4 (see FIGS. 3 and 4).

On the other hand, the elastic member 81 disposed in the upper expansion-contraction portion 8A2 (the portion of the expansion-contraction portion 8 located in the non-absorbent body arrangement region A2) is as shown in Figs. 1 and 4, and is the back portion A (maximum width portion). One end side in the width direction Y of A3) continuously extends toward the other end side, and is formed so as to be stretchable as it is as a whole.

In the present embodiment, when the elastic member 81 of the lower expansion-contraction portion 8A1 (absorbent body arrangement region A1) is sandwiched between the two sheet materials 80 and 80, as shown in FIG. At least a part of the portion overlapping the absorber 4 in plan view (the central portion of the width direction Y of the portion) is fixed to the two sheet materials 80 and 80 in a non-stretchable manner, thereby making the portion Non-elastic portion 82. As a method of preventing the elastic member 81 from exhibiting stretchability (method of forming the non-elastic portion 82), a method generally used in such a disposable diaper can be used without particular limitation, and for example, the elastic member 81 can be divided into finer parts. A method of breaking without causing stretching, or a method of preventing the elastic member 81 from stretching and contracting by using bonding with an adhesive or the like.

In this manner, the elastic member 81 includes the non-elastic portion 82 in a portion overlapping the absorbent body 4, whereby the end portion of the longitudinal direction X of the absorbent body 4 can be placed along the wearer's buttocks without causing the absorbent body 4 to have longitudinal pleats. In addition to preventing leakage, it is possible to prevent problems such as leaving marks on the top of the pleats generated on the absorbent body 4 and leaving the skin. The ratio of the length W6 (see FIG. 4 ) of the non-elastic portion 82 in the width direction Y to the length W5 (see FIG. 4 ) in the width direction Y of the absorber 4 (length W6) from the viewpoint of more effectively exhibiting the effect of the operation The length W5) is preferably 70% or more and 95% or less, and more preferably 80% or more and 90% or less. The length (width) W5 of the absorbent body 4 and the length (width) W6 of the non-elastic portion 82 mean the length in the width direction Y of the portion in which the length in the width direction Y in the relevant portion is the largest.

Further, by making the width W6 of the non-elastic portion 82 narrower than the width W5 of the absorbent body 4, the inner end portion of the elastic member 81 in the width direction Y of the portion other than the elastic portion 82 is fixed to the absorbent body 4 The side portion in the longitudinal direction X, whereby the absorbent body 4 and the fastening tape 6 are connected to each other in the width direction Y via the elastic member 81 in the back side portion A, so that the back side portion A is entirely wider. The degree direction Y is flexible. Further, when the diaper 1 is worn, the belt grip portion 61 of the fastening tape 6 of the back side portion A is fixed to the buckle of the ventral side portion C overlapping with the projecting portion 41 of the absorbent body 4 by a conventional method. The belt 7 is formed around the abdomen of the wearer to form a waistband-like wear portion including the elasticized portion 8 and the fastening tape 6 (the back side A having elasticity) and the buckle belt 7 by the waistband wear. The action of the portion can firmly fix the rear end portion of the absorbent body 4 in the longitudinal direction X to the wearer's body, and can be used even when the absorbent body 4 absorbs the excrement during the wearing process to increase the weight. The diaper 1 is not easily offset by the effect of falling.

The expansion and contraction force of the elasticized portion 8 (the lower elasticized portion 8A1 and the upper elasticized portion 8A2) is more effective in exerting the effect of the above-described belt-shaped wearing portion (the weight of the absorbent body 4 is absorbed when the absorbent body 4 absorbs the excrement, and the diaper 1 is not easily displaced. It is determined that the detachable portion 8A2 in the upper portion of the non-absorbent body arranging region A2 is important in that the diaper 1 can be provided in comparison with the elastic force which has a strong emphasis on preventing the diaper 1 from falling off. The elastic force of the end portion of the longitudinal direction X is softly applied to the body. From this point of view, in the present embodiment, the expansion and contraction force of the upper elasticized portion 8A2 is smaller than that of the lower elasticized portion 8A1 located in the lower portion of the absorbent body arrangement region A1, whereby the absorbent body 4 is worn when the diaper 1 is worn. It is firmly fixed to the body, and the end portion of the longitudinal direction X of the diaper 1 is softly applied to the body, whereby leakage from the end portion can be effectively prevented.

The expansion and contraction force of the lower elasticized portion 8A1 is preferably 1.0 N or more and 6.0 N or less, more preferably 1.5 N or more and 4.0 N or less, and the expansion and contraction force of the upper elasticized portion 8A2 is preferably 0.5 N or more and 3.0 N or less, and more preferably 0.8 or less. N above 2.5 N under. The ratio of the expansion and contraction force of the lower elasticized portion 8A1 to the expansion and contraction force of the upper elasticized portion 8A2 (the lower elasticized portion 8A1/the upper elasticized portion 8A2) is preferably 1.2 or more and 5.0 or less, and more preferably 1.5 or more and 3.0 or less. The expansion and contraction force of each part of the expansion-contraction part 8 was measured as follows.

<Method for measuring the stretching force>

The measurement target portion (the portion corresponding to the upper expansion-contraction portion 8A2 and the lower expansion-contraction portion 8A1 (see FIG. 4) is cut out from the diaper as a measurement sample. In the measurement, a universal tensile tester (model; RTA-100, manufactured by ORIENTEC Co., Ltd.) was used, and the distance between the initial chucks was set to the natural length of the diaper width direction from the measurement target portion (back side A) ( The length obtained by subtracting 50 mm from the length in the natural state in which the elastic member is not elongated is measured, and the portion of the left and right side edges of the sample along the longitudinal direction of the diaper is located at a portion where the waist elastic member (elastic member 81) is disposed. The left and right sides are respectively clamped to the collet. The measurement sample in which the both ends of the diaper width direction are sandwiched on the chuck is pulled and stretched to a natural length from the width direction of the diaper (the front sheet 2 or the back sheet) at a jig moving speed of 300 mm/min. The natural length of 3) is obtained by subtracting the length obtained by 20 mm, and the tensile load at this time is set as the stretching force of the measurement sample.

As described above, as a method of establishing the magnitude relationship between the upper elastic-contraction portion 8A2 and the lower elastic-contraction portion 8A1, the elongation of the elastic member 81 disposed in the upper elastic-contraction portion 8A2 is smaller than that in the lower expansion-contraction portion. The method of the elongation of the elastic member 81 of the 8A1 (the method of fixing the elastic member 81 disposed in the lower elasticized portion 8A1 in a state in which the elastic member 81 disposed in the upper elasticized portion 8A2 is further extended), and 2) the upper portion Stretch The number of the elastic members 81 of the constricted portion 8A2 is smaller than the number of the elastic members 81 of the lower constricted portion 8A1, and the like may be used singly or in combination. Moreover, it is preferable that the elastic member 81 arrange|positioned in the expansion-contraction part 8 (the lower expansion-contraction part 8A1 and the upper expansion-contraction part 8A2) is 20% or more, and it is set as the range of 30% or more and 120% or less. Here, the elongation is the ratio of the length of the elongation to the natural length, for example, when the natural length is 10 cm, the elongation is 100 [={10/(20-10)}. ×100]%. Further, in the present embodiment, as described above, the plurality of elastic members 81 disposed in the elasticized portion 8 must have the same fineness. Therefore, the elastic members having different deniers are not used in the lower elasticized portion 8A1 and the upper expanded and contracted portion 8A2. method.

As shown in FIG. 4, the outermost first imaginary straight line extending in the width direction Y in conformity with the elastic member 81 located on the outermost side in the longitudinal direction X of the plurality of elastic members 81 constituting the elasticized portion 8 is drawn. In the case of V1p, and drawing the innermost first imaginary straight line V1q extending in the width direction Y in correspondence with the elastic member 81 located at the innermost side in the longitudinal direction X, i) the belt base 60 is located on the outer side in the longitudinal direction x The upper end portion 60p is located in the vicinity of the outermost first imaginary straight line V1p and is located further inside the longitudinal direction X (lower in FIG. 4) or on the outer side of the longitudinal direction X than the outermost first imaginary straight line V1p. (upward in FIG. 4); ii) the lower end portion 60q of the belt base portion 60 on the opposite side to the upper end portion 60p (the end portion of the belt base portion 60 located on the inner side in the longitudinal direction X) is located at the innermost side first The vicinity of the imaginary straight line V1q and the outer side of the longitudinal direction X (upward in FIG. 4) or the innermost first imaginary straight line V1q on the inner side of the longitudinal direction X (in FIG. 4 is lower) square). Therefore, the length W1 of the longitudinal direction X of the belt base 60 (that is, the distance between the upper end portion 60p and the lower end portion 60q) is substantially equal to the distance L1 between the outermost first imaginary straight line V1p and the innermost first imaginary straight line V1q. Or more than the length of the distance L1. Here, the length W1 of the belt base portion 60 means the length in the longitudinal direction X of the portion in which the length X in the longitudinal direction X of the belt base portion 60 is the largest. In addition, "the length W1 is substantially equal to the distance L1 or longer than the distance L1" means that the ratio of the length W1 to the distance L1 (the length W1/the distance L1) is in the range of 70% or more and 110% or less. The ratio is preferably 75% or more and 100% or less, and more preferably 80% or more and 100% or less.

In this manner, the upper end portions 60p and 60q of the belt base portion 60 are located in the vicinity of the respective first virtual straight lines V1p and V1q, whereby the plurality of elastic portions constituting the elasticized portion 8 (the lower elasticized portion 8A1 and the upper elasticized portion 8A2) can be elasticized. The contraction force of the entire member 81 is connected to the belt base 60, whereby the action of the elastic portion 8 (the effect of the belt-shaped wearing portion described above) can be further effectively exhibited. In other words, from the viewpoint of the effect of the elastic portion 8, the upper end portions 60p and 60q of the belt base portion 60 may be present in the range in which the plurality of elastic members 81 constituting the elastic portion 8 are present, and the upper and lower end portions 60p may be present. 60k may be present on the outer side of the region sandwiched by the two first imaginary straight lines V1p and V1q without hindering the expansion and contraction force of the elastic member 81.

Further, in the present embodiment, in addition to the above i) and ii), iii) the main portion of the belt base portion 60 is present in the region sandwiched by the outermost first imaginary straight line V1p and the innermost first imaginary straight line V1q. in. Here, the "main portion of the belt base" includes the center of the length direction X of the belt base 60 and occupies The center portion of the belt base having more than one-half of the total area of the base portion 60. By causing the main portion of the belt base portion 60 to exist in the region sandwiched by the two first imaginary straight lines V1p, V1q, the contraction force of the plurality of elastic members 81 constituting the elasticized portion 8 reacts with the belt base portion 60. It is good, and the effect of the expansion-contraction part 8 (the effect of the said belt-belt wear part mentioned above) is fully utilized more effectively.

Further, in the present embodiment, as shown in Fig. 4, iv) the elastic members 81 which are located on the outermost and innermost sides in the longitudinal direction X among the plurality of elastic members 81 disposed in the lower elasticized portion 8A1 are drawn. In the case where each of the first and second imaginary straight lines V2 and V2 extending in the width direction Y coincides with each other, the main portion of the belt holding portion 61 is sandwiched between the two second imaginary straight lines V2 and V2. In the area. Among the two second imaginary straight lines V2 and V2, the innermost side in the longitudinal direction X is the same as the innermost first imaginary straight line V1q. Here, the "main portion of the belt grip portion" refers to a belt grip portion central region including a center of the longitudinal direction X of the grip portion 61 and occupying one or more of the total area of the belt grip portion 61. By having the main portion of the belt grip portion 61 present in the region sandwiched by the two second imaginary straight lines V2, V2, the belt grip portion 61 can selectively transmit the plurality of elastic members constituting the lower telescopic portion 8A1. The contraction force of 81 further exerts the effect of the expansion and contraction portion 8 (the effect of the belt-like wearing portion described above).

The diaper 1 of the present embodiment has the characteristics of the above i) to iv), and the contraction force of the plurality of elastic members 81 constituting the elasticized portion 8 in the back side portion A can be integrally formed by the belt base portion 60 at the time of wearing. The fastening tape 7 is connected to the abdominal portion C, and the contraction force of the elastic member 81 disposed on the lower elasticized portion 8A1 is strongly coupled to the extension of the absorbent body 4 by the belt grip portion 61. Out 41. The overlapping buckle belt 7 is formed, whereby the rear end portion of the absorbent body 4 in the longitudinal direction X is combined with the lower elasticized portion 8A1 (sheet material 80), the belt base portion 60, the belt holding portion 61, and the buckle belt 7 It is worn around the abdomen of the wearer in the shape of a belt and is a constituent member of the belt-like wearing portion. Therefore, it can be firmly fixed to the body, even if the absorbent body 4 absorbs excrement during wearing. When the weight is increased, the diaper 1 can also exert an effect of being less likely to fall off. Further, in particular, since the main portion of the belt holding portion 61 does not substantially exist in the upper elasticized portion 8A2 located on the outer side of the region sandwiched by the two second virtual straight lines V2 and V2, the upper portion of the belt grip portion 61 is substantially not present. In the upper elastic-contraction part 8A2, the expansion-contraction force by the lower expansion-contraction part 8A1 is soft-acting, and the end part of the longitudinal direction X of the diaper 1 is softly adhered to the body, and the leak from this end part can be prevented effectively. In short, during the wearing of the diaper 1, the offset of the diaper 1 is effectively prevented, and the waist portion of the back side portion A (the one end 10a in the longitudinal direction of the back side A side of the body 10 and its vicinity) is less likely to occur. The wearer's skin is curled away from the direction of the skin, improving the fit around the waist.

In the present invention, at least the two wrinkles are obtained from the viewpoint that the effect of the belt-like wearing portion is such that the three-dimensional wrinkles and/or the leg gathers are wrinkled to further improve the conformability and the leakage prevention property of the wrinkles. One of the elastic members for forming a pleat is preferably as shown in FIG. 1. When the main body 10 (diaper 1) is viewed in plan, one end portion of the longitudinal direction X overlaps with the elastic portion 8, and the other end portion overlaps with the buckle 7 . In the present embodiment, as shown in FIG. 1, the elastic member 51 for forming the three-dimensional gathers is overlapped with the elasticized portion 8 and the fastening tape 7, whereas the elastic member 52 for forming the leg gathers does not overlap the elasticized portion 8 and Buckle belt 7 heavy The elastic member 52 may overlap the elasticized portion 8 and the fastening tape 7 . The three-dimensional pleat-forming elastic member 51 that overlaps with the elastic portion 8 and the fastening tape 7 is generally indirectly connected to the elasticized portion 8 and the fastening tape 7 via a sheet material such as the side surface sheet 5 as shown in FIG. . Further, the leg gathers forming elastic member 52 that overlaps the stretchable portion 8 and the fastening tape 7 is indirectly connected to the stretchable portion 8 and the fastening tape 7 via a sheet material such as the back sheet 3.

In this way, the elastic member 51 for forming the three-dimensional gathers overlaps with the elasticized portion 8 (back side portion A) and the buckled belt 7 (ventral side portion C) constituting the waistband-shaped wearing portion in a plan view (indirectly connected) And the three-dimensional pleats are interlocked with the belt-like wearing portion, and the effect of the belt-like wearing portion (the body of the wearer 4 is fixed to the wearer's body) is connected to make the three-dimensional pleats more easily attached to the body. Thereby, the effect of the three-dimensional wrinkles (anti-leakage) can be further effectively exerted. Further, when the leg gathers forming elastic member 52 overlaps (indirectly connects) the stretchable portion 8 and the buckled belt 7 in a plan view, the leg gathers are interlocked with the waistband wear portion, and The action of the belt-like wearing portion is connected to make the leg gathers more easily attached to the body, whereby the effect of the leg wrinkles (anti-leakage) can be further effectively exerted. In this manner, the absorbent body 4 is fixed to the body when worn, and the three-dimensional wrinkles and the leg gathers which are present independently of the absorbent body 4 are based on the waistband wearing portion. Along the body, a form in which the problem of leakage is less likely to occur can be formed.

Further, in the present embodiment, as shown in FIG. 4, the elastic members 81 and 81 which are located at the outermost and innermost sides in the longitudinal direction X among the plurality of elastic members 81 disposed in the upper elasticized portion 8A2 are drawn. Each of them consistently In the case of the two third imaginary straight lines V3 and V3 extending in the width direction Y, the distance L3 between the two third imaginary straight lines V3 and V3 is shorter than the distance L2 between the two second imaginary straight lines V2 and V2. Among the two third imaginary straight lines V3 and V3, the outermost side in the longitudinal direction X is the same as the outermost first imaginary straight line V1p. By thus forming the distance L3 < the distance L2, the above-described effects (the improvement of the compliance around the waist and the anti-offset drop) are more reliably exhibited. The ratio (L2/L3) of the distance L2 to the distance L3 is preferably 45% or more and 75% or less, and more preferably 50% or more and 65% or less.

Further, it is preferable that the length W2 (see FIG. 4) in the longitudinal direction X of the belt grip portion 61 is 70% or more, particularly 80% or more of the length W3 (see FIG. 1) in the longitudinal direction X of the buckle belt 7. 100% or less. If the length W2 of the belt grip portion 61 is 70% or more of the length W3 of the buckle belt 7, the belt grip on the buckle belt 7 when the belt grip portion 61 is fixed to the buckle belt 7 can be reduced. The pleats generated in the peripheral portion of the holding portion 61 further increase the conformability of the rear end portion with respect to the body before the longitudinal direction X of the absorbent body 4. The length W2 of the belt grip portion 61 means the length in the longitudinal direction X of the portion in which the length X of the belt grip portion 61 is the largest. In the present embodiment, the length W2 of the belt grip portion 61 gradually decreases toward the outer side in the width direction Y as shown in FIGS. 1 and 4, so that the portion of the belt grip portion 61 which is closer to the belt base portion 60 is provided. The length in the longitudinal direction X is the length W2 of the belt grip portion 61. Further, the length W3 of the buckle 7 means the length in the longitudinal direction X of the portion in which the length X of the buckle 7 is the largest.

Further, as described above, the elasticized portion 8 is provided at the maximum width portion A3 of the back side portion A, and preferably the outermost first imaginary straight line V1p and the innermost first imaginary The distance L1 between the straight lines V1q is 60% or more of the length W4 (see FIG. 4) in the longitudinal direction X of the maximum width portion A3, and particularly 70% or more and 100% or less. When the distance L1 between the two first imaginary straight lines V1p and V1q is 60% or more of the length W4 of the maximum width portion A3 of the back side portion A, the compliance around the waist portion and the anti-offset drop property can be further improved. The side flaps of the back side portion A (the portions on the outer side in the width direction Y of the absorbent body 4) can be attached to the legs from the wearer's buttocks, and the side flaps of the crotch portion B can be pulled to wear. The upper part of the waist is raised to improve the fit around the leg, and as a result, leakage can be effectively prevented.

The size and the like of each portion of the diaper 1 are preferably set as follows from the viewpoint of further exerting the above-described effects (increasing the conformability around the waist and the anti-offset drop).

The outermost first imaginary straight line V1p is separated from the innermost first imaginary straight line V1q by a distance L1 (see FIG. 4), that is, the length X of the continuous stretchable region having substantially stretchability in the stretchable portion 8 is preferably long. It is 50 mm or more and 100 mm or less, and more preferably 60 mm or more and 90 mm or less.

The distance between the two second imaginary straight lines V2 and V2 is L2 (see FIG. 4), that is, the portion of the lower elasticized portion 8A1 (the portion of the elasticized portion 8 located in the absorbent body arranging region A1) which is substantially elastic. The length in the longitudinal direction X is preferably 20 mm or more and 60 mm or less, and more preferably 30 mm or more and 40 mm or less.

The distance between the two third imaginary straight lines V3 and V3 is L3 (see FIG. 4), that is, the substantially stretchable portion of the upper elasticized portion 8A2 (the portion of the elasticized portion 8 located in the non-absorbent arrangement area A2) Length of length X is longer than It is preferably 10 mm or more and 40 mm or less, and more preferably 20 mm or more and 30 mm or less.

The length W1 (see FIG. 4) in the longitudinal direction X of the belt base 60 is preferably 50 mm or more and 100 mm or less, and more preferably 60 mm or more and 90 mm or less.

The length W2 (see FIG. 4) in the longitudinal direction X of the belt grip portion 61 is preferably 20 mm or more and 60 mm or less, and more preferably 30 mm or more and 40 mm or less.

The length W3 (refer to FIG. 1) of the longitudinal direction X of the buckle 7 is preferably 30 mm or more and 80 mm or less, and more preferably 40 mm or more and 60 mm or less.

The length W4 (see FIG. 4) in the longitudinal direction X of the maximum width portion A3 of the back side portion A is preferably 60 mm or more and 120 mm or less, and more preferably 70 mm or more and 100 mm or less.

The length W5 (see FIG. 4) in the width direction of the absorber 4 is preferably 80 mm or more and 140 mm or less, and more preferably 90 mm or more and 120 mm or less.

The length W6 (see FIG. 4) in the width direction Y of the non-elastic portion 82 is preferably 70 mm or more and 120 mm or less, and more preferably 90 mm or more and 110 mm or less.

Moreover, the ratio (length W2 / distance L2) of the length W2 of the longitudinal direction X of the grip portion 61 with respect to the distance between the two second imaginary straight lines V2 and V2 is preferably 70% or more and 100% or less. It is preferably 80% or more and 100% or less.

Further, the ratio (length W2 / length W1) of the length W2 in the longitudinal direction X of the grip portion 61 to the length W1 of the longitudinal direction X of the belt base portion 60 (i.e., the distance between the upper end portion 60p and the lower end portion 60q) is preferable. It is 40% or more and 70% or less, and more preferably 50% or more and 60% or less.

The interval T1 (see FIG. 4) of the two elastic members 81 and 81 adjacent in the longitudinal direction X is preferably 3 mm or more and 8 mm or less, and more preferably 4 mm or more and 6 mm or less. The plurality of intervals T1 in the expansion/contraction portion 8 (the lower expansion and contraction portion 8A1 and the upper expansion and contraction portion 8A2) may be identical to each other or different from each other.

The number of the elastic members 81 constituting the elasticized portion 8 is preferably 8 or more and 30 or less, more preferably 10 or more and 20 or less, and the number of the elastic members 81 disposed in the lower elasticized portion 8A1 is preferably 5 or more. The number of the elastic members 81 disposed in the upper elasticized portion 8A2 is preferably 3 or more and 10 or less, and more preferably 4 or more and 8 or less, and more preferably 10 or more and 15 or less.

When the materials for forming the portions other than the front sheet 2 in the diaper 1 are described, various sheets previously used in the art can be used as the front sheet 2, the back sheet 3, and the absorber 4, respectively. And side sheet 5. As the front sheet 2, a sheet having liquid permeability can be used, and for example, a nonwoven fabric or an apertured film can be used. As the back sheet 3, a sheet having liquid impermeability and moisture permeability can be used. For example, a resin film having moisture permeability and a water-repellent non-woven fabric provided by providing fine pores penetrating the sheet in the thickness direction can be used. Such as non-woven fabric, and the like, and other laminates with other sheets. As the absorber 4, for example, a liquid-retaining absorbent core comprising a fibrous material such as pulp fibers or a water-absorbent polymer having various shapes such as particles can be used, and the absorbent core can be opened by paper such as toilet paper or various non-woven fabrics. The outer surface (surface facing and non-facing) is coated with a liquid-permeable core material such as a porous film. Further, as the side sheet 5, a sheet made of a water-repellent non-woven fabric or a resin film may be used, or the same as the back sheet 3 may be used.

As the sheet material 80 constituting the elasticized portion 8, for example, a spunbonded nonwoven fabric/spunbonded nonwoven fabric/Spunbond Meltblown Spunbond (SMS) or the like containing polypropylene fibers can be used. The basis weight of the sheet material 80 is preferably 8 g/m ² or more and 20 g/m ² or less, and more preferably 10 g/m ² or more and 15 g/m ² or less. Further, as the elastic member 81 constituting the elasticized portion 8, various linear or band-shaped elastic members previously used in the technical field can be used, and examples of the material thereof include styrene rubber, olefin rubber, and amine base. Acid ester rubber, polyethylene, styrene butadiene, hydrazine, and the like.

The diaper 1 of the present embodiment can be used in the same manner as the disposable disposable diaper which usually includes a fastening tape. The diaper 1 according to the present embodiment has the above-described specific configuration, and the position of the fastening tape 6 is suitable for the relationship between the elasticized portion 8 and the waist portion of the back side portion A during the wearing process. The one end 10a in the longitudinal direction of the back side A side of the back side 10 and the vicinity thereof are curled in a direction away from the skin of the wearer, and the wearability around the waist is excellent, and it is difficult to fall off.

The present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the spirit and scope of the invention. For example, in the above-described embodiment, both end portions of the elastic member 81 constituting the elasticized portion 8 in the width direction Y overlap the belt base portion 60 in plan view as shown in Fig. 1, but may not overlap, and the width of the elastic member 81 may not be overlapped. The end portion of the direction Y may also exist at a position separated by a specific distance from the inside of the tape base 60 in the width direction Y. In other words, the elastic member 81 can also be disposed so as to be entirely housed in the region sandwiched by the pair of left and right belt bases 60, 60.

Further, the expansion/contraction portion 8 is required to be disposed at least in the extended state on the front sheet 2 The plurality of elastic members 81 having the same fineness may be formed between the back sheet 3 and the sheet material 80 may not be included. In this case, the portion corresponding to the distance L1 (see FIG. 4) of the two first imaginary straight lines V1p and V1q among the front sheet 2 and the back sheet 3 is a continuous stretchable region having substantially stretchability. And play the function. Further, the number of sheets of the sheet material 80 may be one.

Regarding the above-described embodiments of the present invention, the following supplementary notes (disposable diapers) are further disclosed.

<1>

A disposable diaper comprising a body having a front sheet, a back sheet, and an absorbent body interposed between the sheets, and including a back side portion, a lower jaw portion, and a ventral portion in a longitudinal direction, and on the back side portion a pair of fastening tapes are provided on the left and right side edges; in the disposable diaper, the absorbent body arrangement region including the protruding portion of the absorbent body from the lower jaw portion is included in the longitudinal direction And a non-absorbent body arranging region in which the projecting portion does not exist, and an expansion-contraction portion is provided in the back-side portion over the absorber-disposed region and the non-absorbent body arranging region, and the stretchable portion is disposed in the extended state a plurality of elastic members having the same fineness between the front sheet and the back sheet, wherein the elastic portion forms a lower elasticized portion in the absorbent body arrangement region, and an upper elastic portion is formed in the non-absorbent disposed region. a plurality of the elastic members are disposed in each of the lower expansion-contraction portion and the upper expansion-contraction portion, and the plurality of elastic members constituting the expansion-contraction portion have a fineness of 450 And dtex or less, and the elastic direction of the elastic member is intermittently arranged in the longitudinal direction in accordance with the width direction of the main body orthogonal to the longitudinal direction, and is disposed in the elastic member of the lower elasticized portion. a portion of the absorber that extends across the absorber in the width direction and extends to the other side and overlaps the absorber, and has a non-elastic portion that suppresses the stretchability of the elastic member, and expands and contracts with the lower portion. The elastic band of the upper telescopic portion is formed to be smaller than the portion, and the fastening tape includes a belt base joined to the main body and a belt grip connected to the belt base and extending outward in the width direction of the main body. The length of the belt grip portion in the longitudinal direction is shorter than the belt base portion, and is drawn on the outermost side of the plurality of elastic members constituting the expansion and contraction portion in the longitudinal direction. The elastic member is uniformly aligned with the outermost first imaginary straight line extending in the width direction, and is drawn to be identical to the elastic member located at the innermost side in the longitudinal direction In the case of the innermost first imaginary straight line extending in the width direction, the end portion of the belt base portion located on the outer side in the longitudinal direction is located in the vicinity of the outermost first imaginary straight line and is further in the longitudinal direction. The inner side is located on the outer side of the longitudinal direction of the outermost first imaginary straight line, and the lower end portion of the belt base located on the opposite side of the upper end portion is located near the innermost first imaginary straight line and is It depends on the length The outer side of the direction or the inner side of the innermost first imaginary straight line is located in the longitudinal direction, and the main portion of the belt base portion is sandwiched between the outermost first imaginary straight line and the innermost first imaginary straight line. In the region, two strips extending in the width direction in accordance with each of the plurality of elastic members disposed in the lower elastic portion and disposed on the outermost and innermost sides in the longitudinal direction are drawn. In the case of the second imaginary straight line, the main portion of the belt grip portion is present in a region sandwiched by the two second imaginary straight lines.

<2>

The disposable diaper according to the above <1>, wherein the elastic member of the outermost and innermost sides in the longitudinal direction of the plurality of the elastic members disposed in the upper elasticized portion is drawn in the same manner as described above In the case of two third imaginary straight lines extending in the width direction, the distance between the two third imaginary straight lines is shorter than the distance between the two second imaginary straight lines.

<3>

The disposable diaper according to the above aspect <1>, wherein the expansion/contraction portion is provided at a maximum width portion of the back side portion in which the length in the width direction is the largest, and the outermost first imaginary straight line and the innermost side. The distance between the first imaginary straight lines is 60% or more of the length of the maximum width portion of the back side portion in the longitudinal direction.

<4>

A disposable diaper according to any one of the above <1> to <3>, wherein The non-facing surface of the side portion is provided with a fastening tape that can hold the above-mentioned belt holding portion, and the length of the belt holding portion in the longitudinal direction is 70% or more of the length of the fastening tape in the longitudinal direction.

<5>

The disposable diaper according to the above <4>, wherein the length of the belt grip portion in the longitudinal direction is preferably 80% or more and 100% or less of the length of the fastener tape in the longitudinal direction.

<6>

The disposable diaper according to the above <4> or <5>, wherein the length of the fastener tape in the longitudinal direction is preferably 30 mm or more, more preferably 40 mm or more, and further preferably 80 mm or less, and further preferably 60mm or less.

<7>

The disposable diaper according to any one of the above-mentioned items, wherein the pleat-forming elastic members are disposed in an extended state along the longitudinal direction at both side portions of the main body in the longitudinal direction, respectively a pair of three-dimensional pleats and a pair of leg pleats, wherein the pleat forming elastic member of at least one of the three-dimensional pleats and the leg pleats is one end portion of the longitudinal direction and the expansion and contraction when the body is viewed from above The portions overlap and the other end overlaps with the above-mentioned buckle.

<8>

The disposable diaper according to any one of the above-mentioned items, wherein the elastic member of the plurality of elastic members constituting the elasticized portion is preferably 150 dtex or more, more preferably 300 dtex or more, and more preferably 450 dtex. Take Further, it is preferably 400 dtex or less.

<9>

The disposable diaper according to any one of the above aspects, wherein the stretchable portion includes a plurality of the elastic members, and further includes two sheet materials disposed between the front sheet and the back sheet. Further, a plurality of the elastic members are sandwiched and fixed between the two sheet materials in an extended state, and the non-elastic portions are formed by sandwiching the elastic members of the lower elasticized portion in two pieces. When the sheet material is interposed, at least a part of the elastic member in a portion overlapping the absorbent body in a plan view is fixed to the two sheet materials in a non-stretchable manner.

<10>

The disposable diaper according to any one of the above aspects, wherein the ratio of the length of the non-elastic portion in the width direction to the length of the absorbent body in the width direction is preferably 70% or more. It is preferably 80% or more, and is preferably 95% or less, and more preferably 90% or less.

<11>

The disposable diaper according to any one of the above-mentioned items, wherein the stretchable force of the lower stretchable portion is preferably 1.0 N or more, more preferably 1.5 N or more, and further preferably 6.0 N or less. It is preferably 4.0 N or less, and the stretching force of the upper elasticized portion is preferably 0.5 N or more, more preferably 0.8 N or more, and is preferably 3.0 N or less, and more preferably 2.5 N or less.

<12>

A disposable diaper according to any one of the above <1> to <11>, wherein The ratio of the expansion and contraction force of the expansion-contraction portion to the expansion/contraction force of the upper telescopic portion (lower expansion-contraction portion/upper expansion-contraction portion) is preferably 1.2 or more, more preferably 1.5 or more, and is preferably 5.0 or less, and further preferably 3.0 or less.

<13>

The disposable diaper according to any one of the above-mentioned items, wherein the stretchable portion having substantially stretchability in the stretchable portion has a length in the longitudinal direction of preferably 50 mm or more, and more preferably It is 60 mm or more, and preferably 100 mm or less, and further preferably 90 mm or less.

<14>

The disposable diaper according to any one of the above aspects, wherein the length of the stretchable portion of the lower stretchable portion in the longitudinal direction is preferably 20 mm or more, and more preferably 30 mm or more. Further, it is preferably 60 mm or less, and more preferably 40 mm or less.

<15>

The disposable diaper according to any one of the above aspects, wherein the length of the tape base in the longitudinal direction is preferably 50 mm or more, more preferably 60 mm or more, and preferably 100 mm. Hereinafter, it is more preferably 90 mm or less.

<16>

The disposable diaper according to any one of the above-mentioned items, wherein the length of the belt grip portion in the longitudinal direction is preferably 20 mm or more, more preferably 30 mm or more, and preferably 60 mm or less, and further preferably 40 mm or less.

<17>

The disposable diaper according to any one of the above aspects, wherein the length of the maximum width portion of the back side portion in the longitudinal direction is preferably 60 mm or more, more preferably 70 mm or more, and It is preferably 120 mm or less, and further preferably 100 mm or less.

<18>

The disposable diaper according to any one of the above aspects, wherein the length of the absorbent body in the width direction is preferably 80 mm or more, more preferably 90 mm or more, and preferably 140 mm. Hereinafter, it is more preferably 120 mm or less.

<19>

The disposable diaper according to any one of the above-mentioned items, wherein the non-elastic portion has a length in the width direction of preferably 70 mm or more, more preferably 90 mm or more, and preferably 120. Below mm, it is preferably 110 mm or less.

<20>

The disposable diaper according to any one of the aspects of the present invention, wherein the ratio of the length of the belt grip portion in the longitudinal direction to the length of the belt base portion in the longitudinal direction is preferably 40% or more. Further, it is preferably 50% or more, and is preferably 70% or less, and more preferably 60% or less.

<21>

The disposable diaper according to any one of the above-mentioned items, wherein the number of the elastic members constituting the elasticized portion is preferably 8 or more, more preferably 10 or more, and preferably 30 Preferably, the number of the elastic members disposed in the lower elasticized portion is preferably 20 or less. It is preferably 5 or more, more preferably 10 or more, and preferably 20 or less, more preferably 15 or less, and the number of the elastic members disposed in the upper elasticized portion is preferably three or more. It is preferably 4 or more, and preferably 10 or less, and more preferably 8 or less.

<22>

The disposable diaper according to any one of the above aspects, wherein the sheet material constituting the stretchable portion is a spunbonded nonwoven fabric/meltblown nonwoven fabric/spunbonded nonwoven fabric (SMS) comprising polypropylene fibers.

<23>

The disposable diaper according to the above <22>, wherein the basis weight of the sheet material is preferably 8 g/m ² or more, further preferably 10 g/m ² or more, and preferably 20 g/m ² or less. Further, it is preferably 15 g/m ² or less.

Example

Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited to the examples.

(Example 1)

An unfolded diaper having the same basic configuration as that of the diaper 1 shown in Figs. 1 to 4 was produced, and this was used as a sample of Example 1. The size of each part, etc. (position position of the fastening tape, etc.) is set as the following Table 1. In addition, in order to make the expansion and contraction stress of the expansion-contraction part 8 different in the expansion-contraction part 8A1 of the lower part of the absorber arrangement area A1, and the upper expansion-contraction part 8A2 of the non-absorber arrangement area A2 (The upper expansion-contraction part 8A2 < lower expansion-contraction part 8A1. In the case where the elongation is 30%, the five elastic members 81 are placed on the upper elasticized portion 8A2, and the nine elastic members 81 are placed on the lower elasticized portion 8A so that the elongation is 50%. . As the front sheet, a liquid-permeable hot air non-woven fabric having a basis weight of 25 g/m ² was used. As the back sheet and the side sheet, a polyethylene resin film (with calcium carbonate) having a liquid impermeability and moisture permeability of 20 g/m ² was used. As the absorbent body, a uniform mixture containing 160 g/m ^{2 of} fluff pulp and 250 g/m ² of water-absorbing polymer was coated with a liquid-permeable toilet paper having a basis weight of 20 g/m ² and a total basis weight of 410 g/ An absorbent body formed on the outer surface of the absorbent core of m ² . The absorbent core has a total length of 370 mm in the longitudinal direction and a total length (maximum length) in the width direction of 115 mm. As the two sheet materials constituting the elasticized portion, an SMS non-woven fabric containing a polypropylene resin having a basis weight of 15 g/m ² was used, and as a plurality of elastic members, a line of a polyurethane having a fineness of 450 dtex was used. Elastic member. The fixing of the elastic member to the sheet material is performed by a hot melt type adhesive.

(Examples 2 to 4 and Comparative Examples 1 to 2)

An unfolded disposable diaper was produced as a sample of Examples 2 and 3 and each comparative example in the same manner as in Example 1 except that the dimensions of the respective portions (the position at which the fastening tape was placed, etc.) were appropriately changed. Further, in the same manner as in Example 1, except that a linear elastic member made of a polyurethane having a fineness of 310 dtex was used as the elastic member constituting the elasticized portion, the developed disposable diaper was produced as Example 4 sample.

(Evaluation)

For each of the samples (disposable diapers) of the examples and the comparative examples, the conformability and the anti-offset drop property were evaluated by the following methods. The results of these and the like are shown in Table 1 below. Furthermore, the symbols such as W1 and L1 in Table 1 are in the figure. The same symbol corresponds to the person.

<Evaluation method of serviceability>

The sample was placed in a baby model made of an acrylic resin, and the appearance of the sample was visually observed, and the sample was touched by hand to functionally evaluate the swelling of the sample from the skin surface of the model and the presence or absence of relaxation of the sample. The case where there is no uplift or slack is regarded as A, and there are some cases where there is some uplift or slack but no problem in use is regarded as B, and a case where there is more bulge or slack is regarded as C.

<Evaluation method of anti-offset dropability>

After injecting 200 g of artificial urine into the sample, the sample was put on the baby model made of urethane, and the amount of deviation from the reference point of the sample was made when the feet of the model were opened and closed 20 times to the left and right. For the measurement, the case where the offset is not dropped at all (the case where the offset drop amount is almost zero) is regarded as A, and a case where a slight offset is observed but there is no problem in use is observed (the offset drop amount is 10 mm). In the following case, it is regarded as B, and it is apparent that the case where the offset falls (the case where the offset drop exceeds 10 mm) is regarded as C. The composition of artificial urine is as follows. 1.94% by mass of urea, 0.7954% by mass of sodium chloride, 0.11058% by mass of magnesium sulfate (hexahydrate), 0.06208% by mass of calcium chloride (dihydrate), 0.19788 mass% of potassium sulfate, 0.0035 mass% of polyoxyethylene lauryl ether and Ion exchange water (remaining amount).

As shown in Table 1, the disposable diapers of the examples were excellent in conformability and were not easily offset. On the other hand, in the disposable diaper of the first comparative example, the main portion of the belt base portion does not exist in the region sandwiched by the outermost first imaginary straight line V1p and the innermost first imaginary straight line V1q (see FIG. 4). The result of poor service. Further, the disposable diaper of Comparative Example 2 is mainly because the main portion of the belt grip portion does not exist in the second imaginary straight line The area sandwiched by V2 and V2 (see Fig. 4) results in poor anti-offset drop.

From the above, in order to improve the conformability of the disposable diaper, the positional relationship between the plurality of elastic members disposed on the elastic portion of the back side portion and the main portion of the belt base portion is particularly important; and, in order to improve the anti-offset drop property, the configuration is The positional relationship between the plurality of elastic members of the lower elasticized portion 8A1 and the main portion of the belt holding portion is particularly important.

1‧‧‧ diapers

2‧‧‧Front sheet

3‧‧‧Back sheet

4‧‧‧Acceptor

4a‧‧‧One end of the longitudinal side of the back side of the absorbent body

5‧‧‧Side sheet

6‧‧‧Buckle belt

7‧‧‧ buckle belt

8‧‧‧Flexing Department

8A1‧‧‧ Lower expansion section

8A2‧‧‧Upper expansion joint

10‧‧‧ Ontology

10a‧‧‧ One end of the length side of the back side of the body

41‧‧‧Outreach

51‧‧‧Elastic members for forming three-dimensional pleats

52‧‧‧Elastic members for the formation of leg folds

60‧‧‧With base

60p‧‧‧Upper end

60q‧‧‧ lower end

61‧‧‧With grip

61a‧‧‧ Fixture

80‧‧‧Sheet material

81‧‧‧Flexible components

82‧‧‧ Non-stretching department

A‧‧‧ Back side

A1‧‧‧Absorber configuration area

A2‧‧‧ non-absorbent configuration area

A3‧‧‧Maximum width portion of the dorsal side

B‧‧‧Lower Department

C‧‧‧ Ventral side

L1‧‧‧ separation distance

L2‧‧‧ separation distance

L3‧‧‧ separation distance

T1‧‧ interval

V1p‧‧‧1st imaginary straight line

V1q‧‧‧1st imaginary straight line

V2‧‧‧2nd imaginary straight line

V3‧‧‧3rd imaginary straight line

W1‧‧‧ Length of the base with the length of the base

W2‧‧‧ Length with the length of the grip

W3‧‧‧The length of the buckle

W4‧‧‧ Length of the maximum width of the back side

W5‧‧‧ Length of the width direction of the absorber

Length of the width direction of the W6‧‧‧ telescopic section

X‧‧‧ length direction

Y‧‧‧Width direction

Fig. 1 is a view schematically showing an embodiment of a disposable diaper according to the present invention, and showing a skin-facing side (front sheet side) in which an elastic member of each portion is stretched and expanded in a planar manner. Part of the lack of a top view.

Fig. 2 is a schematic cross-sectional view showing a cross section taken along line I-I of Fig. 1 (a cross section in the width direction).

Fig. 3 is a schematic cross-sectional view showing a cross section taken along line II-II of Fig. 1 (a cross section in the width direction).

Fig. 4 is a view for explaining the configuration of a stretchable portion in the disposable diaper shown in Fig. 1.

4‧‧‧Acceptor

4a‧‧‧One end of the longitudinal side of the back side of the absorbent body

6‧‧‧Buckle belt

8‧‧‧Flexing Department

8A1‧‧‧ Lower expansion section

8A2‧‧‧Upper expansion joint

10‧‧‧ Ontology

10a‧‧‧ One end of the length side of the back side of the body

41‧‧‧Outreach

60‧‧‧With base

60p‧‧‧Upper end

60q‧‧‧ lower end

61‧‧‧With grip

80‧‧‧Sheet material

81‧‧‧Flexible components

82‧‧‧ Non-stretching department

A‧‧‧ Back side

A1‧‧‧Absorber configuration area

A2‧‧‧ non-absorbent configuration area

A3‧‧‧Maximum width portion of the dorsal side

L1‧‧‧ separation distance

L2‧‧‧ separation distance

L3‧‧‧ separation distance

T1‧‧ interval

V1p‧‧‧1st imaginary straight line

V1q‧‧‧1st imaginary straight line

V2‧‧‧2nd imaginary straight line

V3‧‧‧3rd imaginary straight line

W1‧‧‧ Length of the base with the length of the base

W2‧‧‧ Length with the length of the grip

W4‧‧‧ Length of the maximum width of the back side

W5‧‧‧ Length of the width direction of the absorber

Length of the width direction of the W6‧‧‧ telescopic section

X‧‧‧ length direction

Y‧‧‧Width direction

Claims (5)

A disposable diaper comprising a body having a front sheet, a back sheet, and an absorbent body interposed between the sheets, and including a back side portion, a lower jaw portion, and a ventral portion in a longitudinal direction, and on the back side portion a pair of fastening tapes are provided on the left and right side edges; in the disposable diaper, the back side portion includes an absorbent body arrangement region in which the protruding portion of the absorbent body from the lower jaw portion is present in the longitudinal direction, and a non-absorbent body arranging region of the projecting portion, wherein the back side portion is provided with an elastic-contracting portion that is disposed in an extended state on the front surface sheet over the absorber-disposed region and the non-absorbent body arranging region And a plurality of elastic members having the same fineness between the material and the back sheet, wherein the elasticized portion forms a lower elasticized portion in the absorbent body arrangement region, and an upper elasticized portion is formed in the non-absorbent disposed region, and a plurality of the elastic members are disposed in the lower elasticized portion and the upper elasticized portion, and the plurality of elastic members constituting the elasticized portion have a fineness of 450 dtex or less. The stretching direction of the member is intermittently arranged along the longitudinal direction in accordance with the width direction of the main body orthogonal to the longitudinal direction, and is disposed in the elastic member of the lower elastic portion from the width direction of the absorber One of the outer sides extends across the absorber and extends to the other side, and has a non-elastic portion that suppresses the stretchability of the elastic member in a portion overlapping the absorber, and the upper portion is higher than the lower stretch portion. The telescopic force of the expansion and contraction The above-mentioned fastening tape comprises a belt base joined to the main body, and a belt grip portion connected to the belt base and extending outward in the width direction of the main body, and the belt grip is compared with the belt base. The length of the holding portion in the longitudinal direction is short, and the outermost first portion extending in the width direction in accordance with the elastic member located at the outermost side in the longitudinal direction among the plurality of elastic members constituting the elasticized portion is drawn. In the case of a virtual straight line and drawing the innermost first imaginary straight line extending in the width direction in correspondence with the elastic member located at the innermost side in the longitudinal direction, the upper end portion of the belt base portion on the outer side in the longitudinal direction is located The outermost first imaginary straight line is located on the inner side in the longitudinal direction or on the outer side in the longitudinal direction of the outermost first imaginary straight line, and is located on the opposite side of the upper end portion. The lower end portion of the belt base is located near the innermost first imaginary straight line and is located further outward than the longitudinal direction, or is located at the innermost first imaginary straight Further, the inner side of the longitudinal direction and the main portion of the belt base portion are present in a region sandwiched by the outermost first imaginary straight line and the innermost first imaginary straight line, and are drawn and disposed in the lower elasticized portion In the case where the plurality of elastic members of the plurality of elastic members that are located at the outermost and innermost sides in the longitudinal direction are in the same manner in the two width directions extending in the width direction, the belt holding portion is The main part is present in 2 The area enclosed by the second imaginary line. The disposable diaper according to claim 1, wherein the elastic member which is located at the outermost and innermost sides in the longitudinal direction of the plurality of elastic members disposed in the upper elasticized portion is drawn in the width direction In the case of the two third imaginary straight lines extending, the distance between the two third imaginary straight lines is shorter than the distance between the two imaginary straight lines. The disposable diaper according to claim 1 or 2, wherein the expansion/contraction portion is provided at a maximum width portion of the back side portion having the largest length in the width direction, and the outermost first imaginary straight line and the innermost first imaginary straight line The distance between the longest portions of the back side portion is 60% or more of the length in the longitudinal direction. The disposable diaper according to claim 1 or 2, wherein a non-facing surface of the ventral side portion is provided with a fastening tape that can hold the belt grip portion, and the length of the belt grip portion in the longitudinal direction is The length of the buckle in the longitudinal direction is 70% or more. The disposable diaper according to claim 4, wherein a pair of three-dimensional pleats and a pair of legs are respectively formed by arranging elastic members for forming pleats in an elongated state in the longitudinal direction of both sides of the main body in the longitudinal direction. At least one of the three-dimensional pleats and the leg pleats, at least one of the three-dimensional pleats and the leg pleats, overlaps one end portion of the elastic member in the longitudinal direction with the expansion-contraction portion, and the other end portion and the buckle portion overlapping.