JP6550401B2 - Disposable diapers - Google Patents

Description

  The present invention relates to disposable diapers.

  Conventionally, a diaper body having an absorbent body, having a front and rear waist area and a crotch area located between the front and rear waist areas, a pair of waist belts for connecting the front and rear waist areas, a waist opening and a pair of leg openings Disposable diapers are known. For example, in the disposable diaper disclosed in Patent Document 1, a pair of waist belts are joined to the diaper body via a joining line that approaches the longitudinal center line from the leg opening side toward the waist opening side, and the diaper body is In contrast, a pair of waist belts are arranged symmetrically with respect to a longitudinal center line bisecting the longitudinal dimension and a transverse center line bisecting the lateral dimension.

JP 9-10261 A

  In the diaper described in Patent Document 1, in the front waist region and the rear waist region, the crossing angle between the joining line and the longitudinal center line is equal to each other, while the wearer's body is on the ventral side (front waist region side Since the shape is different between the back side (rear waist region side) and the back side (rear waist side), the diaper can not be pulled up to an appropriate wearing position suited to the shape of the body, and there is a problem that it is difficult to fit the body.

  Therefore, an object of the present invention is to improve the prior art and to provide a disposable diaper that is highly fit to the body.

  In order to achieve the above object, the present invention is directed to a longitudinal direction and a lateral direction, and a longitudinal center line which divides the dimension in the lateral direction into two equal parts. The present invention relates to a disposable diaper including a crotch region located between the regions, a diaper body having an absorbent body, a pair of waist belts for connecting the front and rear waist regions, a waist opening, and a pair of leg openings.

The pair of waist belts is joined to the diaper body through a joint line approaching the longitudinal center line from the leg opening side toward the waist opening side in the front and rear waist regions, and the waist opening and the waist belt The crossing angle between an imaginary line orthogonal to the waist opening at the intersection with the joint line and the joint line is different between the front waist area and the rear waist area, and the diaper body is a liquid-permeable inner layer sheet A liquid-impervious outer layer sheet, the absorber positioned between the inner and outer layer sheets, and a pair of side sheets extending laterally outward from the absorber, the side sheet comprising: located in a direction intersecting said junction line, and have been joined to the waist belt through the junction line, the said absorber layer It is fixed between the over bets.

  Since the crossing angle in the front waist region is larger than the crossing angle in the rear waist region, movement of the thighs is not inhibited on the front waist region side, and the heel portion is covered on the rear waist region side can do.

  In the contracted state, the waist belt extends obliquely with respect to the longitudinal center line, and the waist opening edge has a convexly curved shape downward, so that it has a clean appearance like underwear. When worn, it becomes easy to grip and pull up the sides of the diaper.

  The apparatus further includes a horizontal center line bisecting the longitudinal dimension, and bending along the horizontal center line to bring the inner surfaces of the front and rear waist regions into contact with each other and in a contracted state Since the lateral center of the front waist region and the lateral center of the rear waist region do not overlap with each other, the front and rear of the diaper can be easily identified.

  The crossing angle in the front waist region is 20 to 70 degrees, and the crossing angle in the rear waist region is 10 to 60 degrees. The buttocks can be covered on the area side, the fit to the body can be improved, and the leakage of excrement can be prevented.

  Since the waist belt is joined to the skin facing surface side of the diaper body, the joint line is not pressed against the body and does not give a sense of discomfort when worn.

  In the waist belt, since the waist elastic sheet extending along the leg opening edge is disposed, the leg opening edge can be planarly fitted to prevent lateral leakage of the excrement.

  The leg opening edge has an upper portion extending from the lower end edge on the front waist region side of the waist belt to the lower end edge on the rear waist region side, and the waist elastic sheet is narrowest at the central portion of the upper portion Thus, it is possible to realize an appropriate fit to the shape of the body while reducing the material cost.

  According to one or more embodiments of the disposable diaper according to the present invention, in the front and rear waist region, the pair of waist belts is connected to the diaper body through the joint line approaching the longitudinal center line from the leg opening side toward the waist opening side In the shape of the wearer's body by having different crossing angles between the virtual waist line and the joining line at the intersection of the waist opening and the joining line, which are different from each other in the front waist area and the rear waist area. The diaper can be pulled up to an appropriate and suitable wearing position, and the fit can be improved.

The drawings illustrate certain embodiments of the present invention according to the present disclosure and include not only the essential features of the invention, but also optional and preferred embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of a diaper shown as an example of the disposable diaper in 1st Embodiment of this invention. The top view in the state which made the diaper extend longitudinally and transversely, and made the inner surface of a waist belt, and the inner surface of a diaper main body contact. The unfolded top view in the state which unbonded the joining line in the front and back waist area of a diaper, and extended the diaper main body and the waist belt in the longitudinal direction and the transverse direction. Sectional drawing in alignment with the IV-IV line of FIG. (A) The elements on larger scale of the area | region enclosed with the V (a) line | wire of FIG. (B) A partially enlarged view of the region enclosed by the V (b) line in FIG. The top view of the diaper in the state which bent along the horizontal center line which bisects the dimension of a longitudinal direction, made the inner surfaces of back and front waist area mutually contact, and was shrunk. (A) Side view in the wearing state of the conventional diaper. (B) The side view in the wearing condition of the diaper which concerns on this invention. The side view in the wearing condition of the diaper concerning the present invention. (A)-(d) The figure which shows a part of manufacturing process of a diaper. (A) Sectional drawing which follows X (a) line of FIG. 9 (a). (B) Sectional drawing which follows X (b) line of FIG.9 (d).

  The following embodiments relate to the disposable diaper shown in FIGS. 1 to 10, which is an example of the present invention, and include not only the essential configuration of the invention but also optional and preferable configurations. In each of the elastic bodies described later in FIGS. 2 to 4, the gathers generated in the members to which the elastic bodies are attached are natural due to the contraction forces in the transverse direction X and the longitudinal direction Y against the contraction force. It is in a state of being stretched to such an extent that it appears to be substantially lost by vision.

  1 to 3, a diaper 10 which is an example of a disposable diaper according to the present invention has a longitudinal direction Y and a transverse direction X orthogonal thereto, a skin facing surface and a non-skin facing surface on the opposite side, and A front waist region 11 and a rear waist region 12 having a longitudinal center line P which divides the length dimension of the direction X into two, and a horizontal center line Q which divides the length dimension of the vertical direction Y into two equal parts; And a crotch region 13 located between the front waist region 11 and the rear waist region 12. The diaper 10 is substantially symmetrical with respect to the longitudinal centerline P and has a waist opening 14 and a pair of leg openings 15.

  The diaper 10 includes a diaper body 16 having an absorbent body 23 and extending in the longitudinal direction Y, and a pair of waist belts 17 for connecting the front and rear waist regions 11 and 12. A pair of waist belts 17 are arranged substantially symmetrically with respect to the longitudinal center line P, and a joint formed of a plurality of independent seal portions approaching the longitudinal center line P from the leg opening 15 side toward the waist opening 14 side It is joined to diaper body 16 via line (seal line) 18A and 18B. The sealing portion is provided by a known bonding means, for example, various heat welding means such as heat embossing and sonic processing. The waist belt 17 has the skin-facing surface thereof and the skin-facing surface of the diaper body 16 fixed to each other at the bonding lines 18A and 18B. By having such a bonding mode, the bonding lines 18A and 18B do not touch the body of the wearer to give discomfort or irritation. As long as the effects of the present embodiment described later can be obtained, well-known joining means such as a hot melt adhesive can be used for the joining lines 18A and 18B in addition to the thermal welding means. The waist belt 17 is formed of a pair of elastic panels, but can be formed of the same sheet material as the diaper body 16 by a manufacturing method described later.

<Diaper body>
With reference to FIGS. 3 to 5, the diaper body 16 is defined by the front end edge 16 a and the rear end edge 16 b spaced apart in the longitudinal direction Y and the opposite side edges 16 c and 16 d spaced apart in the lateral direction X, It has a front end portion 20A located between the front end edges 16a, a rear end portion 20B located between the rear end edges 16b, and an intermediate portion 20C located between the front and rear end portions 20A and 20B. The front and rear end edges 16a and 16b are substantially symmetrical with respect to the longitudinal center line P, and extend in a convex shape outward in the longitudinal direction Y. The front and rear end portions 20A and 20B are respectively located in the front and rear waist regions 11 and 12 of the diaper 10, and the middle portion 20C is located in the crotch region 13.

  The diaper body 16 is an absorbent body located between the liquid permeable inner layer sheet 21 located on the skin facing surface, the liquid impermeable outer layer sheet 22 located on the non-skin facing surface, and the inner and outer layers sheets 21 and 22 And 23 a liquid-impervious or liquid-impervious leak-barrier sheet 24 positioned between the absorber 23 and the outer layer sheet 22. A pair of side sheets 25 which are separated from each other in the lateral direction X and extend in the longitudinal direction Y are disposed on both sides of the inner and outer layer sheets 21 and 22 in a state of being interposed therebetween.

The inner layer sheet 21 has a substantially octagonal shape and has a weight of about 15 to 35 g / m ² , preferably about 18 to 24 g / m ^{2 and} is hydrophilically treated, hydrophobic air-through fiber nonwoven fabric, spunbond fiber nonwoven fabric, point bond fiber nonwoven fabric It is preferable that it is formed from etc. The outer layer sheet 22 is substantially the same shape and size as the inner layer sheet 21 and has a weight of about 15 to 30 g / m ² , preferably about 18 to 24 g / m ^2. It is preferable that it is formed from a fiber non-woven fabric or a spunbonded fiber non-woven fabric as SMS.

  The absorbent body 23 has front and rear end edges 23a and 23b which are curved outward in the longitudinal direction Y, and both side edges 23c extending in the longitudinal direction Y between the front and rear end edges, And a liquid diffusive core cover sheet such as tissue paper covering the absorbent core. Wood fluff pulp, superabsorbent polymer particles, or mixtures thereof can be used as the absorbent core. The absorbent core and the core cover sheet can be joined together using known joining means such as a hot melt adhesive.

  The leak-barrier sheet 24 is disposed to cover at least the entire non-skin facing surface (bottom surface) of the absorber 23, and between the absorber 23 and the outer layer sheet 22, known bonding such as hot melt adhesive is performed. It can be joined by means. As the leak-proof sheet 24, for example, a liquid-impervious, preferably liquid-impervious and air-permeable plastic film can be used, and the leak-proof sheet 24 covers the entire non-skin facing surface of the absorber 23. By this, it is possible to prevent the body fluid absorbed by the absorber 23 from leaking to the outside of the diaper 10. Although not shown, it is possible to transmit the decorative element from the outer layer sheet 22 having a required light transmittance by using a sheet having a decorative element such as a design or a color as the leakproof sheet 24.

Referring to FIGS. 4 and 5, the pair of side sheets 25 are disposed on both sides in the transverse direction X of the absorbent body 23, and a known hot melt adhesive or the like is provided between the leakproof sheet 24 and the inner layer sheet 21. Are joined by the joining means of The side sheet 25 is formed of a first sheet 25A located on the absorber 23 side and a second sheet 25B located on the outer layer sheet 22 side, and both sheets 25A, 25B are joined by a known means such as a hot melt adhesive. It is done. As the side sheet 25, for example, a hydrophobic SMS fiber nonwoven fabric or a spunbond fiber nonwoven fabric having a weight of about 10 to 30 g / m ² can be used.

  Further, between the outer edge of the first sheet 25A and the outer edge of the second sheet 25B, a plurality of leg elastic bodies 26 extending in the longitudinal direction and a skin opposite surface side of the leg elastic bodies 26 are located. The leg elastic sheet 27 is disposed. The leg elastics 26 are formed of a plurality of string-like or strand-like elastic materials attached shrinkably and contractably in the longitudinal direction Y between the front end edge 16 a and the rear end edge 16 b of the diaper body 16. . The leg elastic sheet 27 is a belt-like elastic member, and is formed of an elastic stretchable fiber non-woven fabric formed of plain rubber or elastic fibers. By arranging the leg elastics 26 and the leg elastic sheets 27 on both sides of the diaper body 16, leg elastic regions 40 are formed in the lateral portions X of the side edges 23c of the absorber 23. The leg elastic area 40 extends from the joint line 18A located in the front waist area 11 to the joint line 18B located in the rear waist area 12. In the present embodiment, the side sheet 25 is formed of two sheets 25A and 25B, but may be formed by bending and fixing a single fiber non-woven fabric, or formed from the extended portion of the outer layer sheet 22 You may

<West Belt>
With reference to FIGS. 2 and 3, the waist belt 17 has both end edges (front and rear end edges) 17 a and 17 b joined to the diaper body 16 via joining lines 18 A and 18 B, and both side edges 16 c and 16 d of the diaper body 16. It has a lower edge 17c forming a leg opening 15 and an upper edge 17d forming a waist opening edge. The waist belt 17 is divided into an upper portion 51 located on the waist opening side (first side edge side) and a lower portion 52 located on the leg opening side (second side edge side). The widthwise dimensions of the upper and lower portions are about 30 to 70% of the width dimension W1 of the waist belt 17 and preferably 50%. Therefore, for example, in the case of the size M of a normal adult diaper, the width dimension W1 of the waist belt 17 is about 70 mm, and the width dimension of the upper and lower portions 51, 52 is about 35 mm.

  The waist belt 17 has inner and outer layers 31, 32 formed of a waist sheet 30 made of a fiber non-woven fabric. Between the inner and outer layers 31, 32, a plurality of waist elastics 33, 34 formed of a string-like or strand-like elastic material are attached in an expandable state so as to be contractible. The waist elastics 33, 34 have an upper waist elastic 33 disposed in the upper portion 51 and a lower waist elastic 34 disposed in the lower portion 52.

  A waist elastic sheet 35 formed of an elastic fiber non-woven fabric is disposed on the lower side edge 17 c side of the waist sheet 30. The waist elastic sheet 35 is disposed such that a portion thereof overlaps the lower waist elastic body 34 located at the bottom. Moreover, the waist sheet 30 is being fixed in the state by which the one part was bend | folded inside in the upper-side edge 17d side. A plurality of upper waist elastics 33 are disposed in the bent portion 36. Further, the upper waist elastic body 33 disposed in the bent portion 36 and the upper waist elastic body 33 disposed in the portion (main portion) of the waist sheet 30 other than the bent portion 36 have a thickness direction, respectively. It is preferable to be offset in Z. Thereby, concentration of the extension stress due to the upper waist elastics 33 overlapping in the thickness direction Z can be avoided, and fit to the body can be realized in a wide range. Furthermore, the position of the bent portion 36 at the waist opening edge locally lowers the light transmittance, giving a more underwear-like appearance.

  In the present embodiment, ten upper waist elastic bodies 33 are disposed in the upper portion 51 of the waist belt 17, but six upper waist elastic bodies 33 (in the bent portion 36) disposed on the waist opening side The arranged elastic body) has a thickness of 450 to 500 dtex and is fixed in a stretched state by 3.0 to 3.5 times. Also, the four elastic bodies disposed on the leg opening side of the upper waist elastic body 33 have a thickness of 600 to 650 dtex and are fixed in a state of being expanded by 2.5 to 3.0 times There is. Seven lower waist elastic bodies 34 are disposed in the lower portion 52, and the lower waist elastic bodies 34 have a thickness of 600 to 650 dtex and are fixed in a stretched state by 2.5 to 3.0 times. It is done. The pitch (separating dimension) between the elastic bodies in the upper waist elastic body 33 and the lower waist elastic body 34 is equal intervals, and is 5.0 to 6.0 mm.

  As the leg elastic sheet 27, a belt-like elastic sheet made of an elastic stretchable non-woven fabric or a urethane sheet can be used. By arranging the leg elastic sheet 27 at the leg opening edge, the leg elastic area 40 can be fitted to the wearer's body in a planar manner, and side leakage can be effectively prevented, and rubber traces due to biting of elastic yarn or the like Can be prevented.

  In the waist belt 17, the lower waist elastic body 34 and the leg elastic sheet 27 are disposed in the lower portion 52 so that the unit of the lower portion 52 is higher than the extension stress in the transverse direction X per unit area of the upper portion 51. The tensile stress in the transverse direction X per area is high. Thus, by relatively reducing the extension stress of the upper portion 51, the waist opening can be easily expanded when worn. On the other hand, since the extensional stress of the lower portion 52 is relatively high, it can be stably fitted to the wearer's body around the leg and can exert the required holding power. In particular, the diaper 10 is a so-called low-rise type which is shallow in the crotch, and the width dimension of the waist belt 17 is smaller than the width dimension of the diaper body, and the lower portion is easily displaced by the movement of the wearer By stably fitting to the body at 52, such positional deviation can be suppressed.

<Method of measuring elongation stress>
The extension stress of the upper part 51 and the lower part 52 was measured by the following method using a tensile tester manufactured by Instron Japan Company Limited. First, the absorbent body 23 is removed from the diaper 10, and the area forming the front and rear waist areas 11 and 12 extending in the waist circumference direction is cut out to obtain an annular elastic panel. An annular sample 1 corresponding to the upper part of the front and rear waist areas 11 and 12 and a lower part of the front and rear waist areas 11 and 12 by cutting with a cut line extending in the circumferential direction around the waist in the Y direction An annular sample 2 is obtained, and the dimensions of the samples 1 and 2 in the contracted state are measured (K1, K2), respectively.

  First, when measuring the extension stress of the sample 1, the distance between the upper and lower hooks of the tensile tester is adjusted to be the length dimension K1 in the contracted state of the sample 1 to obtain the upper hook (fixing tool). Attach the other end of the sample 1 to one end of the sample 1 and the lower hook (movable tool). Before extension, the distance between the hooks is finely adjusted so that the extension stress is 0.1N. Thereafter, the tensile tester is set to the cycle mode, and the upper hook is moved at a tensile speed of 300 mm / min. For example, for sample 1 (upper part), where the dimension K1 at the time of contraction is 244 mm, the stress at the point when the second 56 mm elongation is repeated by repeating the sample 1 again by 235 mm and then returning to the origin And the stress of the return at the time of 181 mm of 2nd time expansion was measured, and it was set as the extension stress of sample 1. On the other hand, the tensile stress of sample 2 was also determined by the same measurement method as sample 1.

  According to the measurement results by the above measurement method, the stress at the end of the sample 1 was 1.082 N, and the stress at the end of the sample 2 was 1.083 N, both having substantially the same magnitude. Therefore, in the front and rear waist regions 11 and 12, the extensional stress when stretched in the waist direction is approximately the same size, and when worn, the front and rear waist regions 11 and 12 can be spread with a relatively small force. Can. On the other hand, the stress of reversion of sample 1 was 3.476 N and the stress of reversion of sample 2 was 4.557 N. Therefore, it can be said that, in the worn state, the leg opening sides of the front and rear waist areas 11 and 12 fit the body more than the waist opening side.

  The lower waist elastic 34 disposed in the lower portion 52 is attached at a lower extension ratio than the upper waist elastic 33 disposed in the upper portion 51. Specifically, the expansion ratio of the upper waist elastic body 33 is 3.2 to 3.7 times, and the expansion ratio of the lower waist elastic body 34 is 2.7 to 3.2 times. The difference between the expansion ratio and the expansion ratio of the upper waist elastic body 33 is 0.5 or less. Thus, by setting the expansion ratio of the lower waist elastic body 34 to be relatively low, the amount of contraction of the lower portion 52 is smaller than that of the upper portion 51, and the leg opening is smaller than in the expanded state in the contracted state. Since the leg can be easily inserted through the leg opening without being extremely small, the leg can be worn smoothly without being hooked on the leg opening when worn. In addition, by arranging the leg elastic sheet 27 in the lower portion 52 instead of adjusting the pitch and the number of the upper waist elastic body 33 and the lower waist elastic body 34, the dimension of the leg opening edge in the contracted state is the leg The lower portion can be made larger than that in the state where the elastic sheet 27 is not disposed, and the leg opening can be made larger, and furthermore, by setting the difference between the upper and lower portions 51 and 52 to cause an extension stress, the lower portion Even in the case where 52 has a relatively high elongation stress, it fits like a sheet and the biting into the skin is suppressed.

  Moreover, it is preferable that the thickness of the lower waist elastic body 34 be larger than that of the upper waist elastic body 33. As described above, by setting the thickness of the lower waist elastic body 34 relatively large, a relatively large expansion stress can be exhibited at a low magnification, and the fit property of the leg opening edge can be realized. it can.

  Referring to FIGS. 2 and 3, in the stretched state in which the diaper 10 is developed by peeling off the front bonding line 18A, the length dimension L3 of the upper edge 17d is greater than the length dimension L4 of the lower edge 17c. Is also large and trapezoidal. Specifically, for example, in a normal M size diaper, the length dimension (length dimension of the upper portion 51) L5 of the upper edge 17d of the waist belt 17 is 550 to 600 mm, the length dimension of the lower edge 17c The length L6 of the lower portion 52 is 300 to 350 mm, and the width W1 is 60 to 95 mm. Further, even in the state where the waist belt 17 is contracted, the length dimension L6 of the lower portion 52 is smaller than the length dimension L5 of the upper portion 51. In the stretched and contracted states of the waist belt 17, the length dimension L 6 of the lower portion 52 has a size of 50 to 80% of the length dimension L 5 of the upper portion 51.

  Referring to FIGS. 5 (a) and 5 (b), the waist belt 17 has the front and rear joint lines 18A and 18B such that the first side edge 17c is on the leg opening edge side and the second side edge 17d is on the waist opening edge side. The diaper body 16 is connected to the front and rear end portions 20A and 20B of the diaper body 16 so as to be contractible in an extended state. In this embodiment, it is orthogonal to the waist opening edge at the intersection point 61 of the boundary line 60 between the waist belt 17 and the diaper body 16 forming the inner edge of the front joint line 18A and the waist opening edge (parallel to the longitudinal center line P An intersection angle θ1 which is an intersection angle between the imaginary line 62 and the boundary line is an imaginary line 64 and the boundary line orthogonal to the waist opening edge at the intersection 63 of the boundary line forming the inner edge of the rear joint line 18B and the waist opening edge. Different from the intersection angle θ2. The crossing angle θ1 is preferably larger than the crossing angle θ2, and thus the values of the crossing angles in the front and rear waist regions 11 and 12 are different, so that the front side (ventral side) and the rear side (back side) of the diaper 10 are worn when worn. It can be easily identified.

  The crossing angle θ1 is preferably in the range of about 20 to 70 degrees, and more preferably in the range of about 30 to 60 degrees. When the crossing angle θ1 is less than 20 degrees, when the front waist region 11 is pulled up to a position where the waist belt 17 fits when the diaper 10 is fitted, the diaper body 10 is pulled up too much, and the wearer's buttocks periphery There is a risk that the diaper body 10 may be doubly fitted and may not fit without gaps. In addition, when the crossing angle θ1 exceeds 70 degrees, the absorber 23 can not be pulled up sufficiently, and a gap may be generated between the buttocks of the wearer and the diaper body 10.

  The intersection angle θ2 is preferably in the range of about 10 to 60 degrees, and more preferably in the range of about 20 to 50 degrees. When the crossing angle θ2 is less than 10 degrees, when the rear waist region 12 is pulled up to the position where the waist belt 17 fits when the diaper 10 is fitted, the diaper body 16 is pulled too high upwards, and around the sacral region of the wearer There is a risk that the diaper body 16 will be doubly fitted and can not be fitted without gaps. If the crossing angle θ2 exceeds 60 degrees, the absorber 23 can not be pulled up sufficiently, and the diaper main body 16 can not be positioned around the sacrum located above the buttocks of the wearer, and urine is not There is a possibility that a leak may occur because the absorber 23 can not absorb it.

  Referring to FIG. 2, the dimension L2 in the longitudinal direction Y of the absorbent body 23 has a size of about 65 to 95% of the dimension L1 in the longitudinal direction Y of the diaper 10 (diaper body 16). Usually, the longitudinal dimension of the absorbent body is about 60% of the longitudinal dimension of the diaper, and the portion formed only from the sheet member located on the outer side in the longitudinal direction from the absorbent diaper of the diaper The area is relatively large. In the present embodiment, while the absorbent body 23 has a length dimension sufficient to exhibit the required absorption performance, the area of the portion consisting only of the sheet member located outside the longitudinal direction Y is compared By making it small, it can be manufactured with less materials, and the manufacturing cost can be reduced. In addition, since the front and rear end edges 23a and 23b of the absorber 23 and the front and rear end edges 16a and 16b of the diaper main body 16 are closer to each other than a normal diaper, the waist opening is lower than the umbilical part in the wearing state It becomes a low-rise, clean wearing aspect that is located in the.

  Referring to FIG. 6, since the crossing angles θ1 and θ2 of the bonding lines 18A and 18B are different from each other, they are bent along the transverse center line Q to bring the inner surfaces of the front and back waist regions 11 and 12 into contact with each other In the above state, the central portion 11C in the lateral direction X of the front waist region 11 and the central portion 12C in the lateral direction X of the rear waist region 12 do not overlap with each other. In this embodiment, the central portion 12C of the rear waist region 12 protrudes upward relative to the central portion 11C of the front waist region 11 because the intersection angle θ1 is larger than the intersection angle θ2, and the front and rear waist regions 11, 12 are identified. Becomes easier.

  Low waist type diapers are preferred for adult light incontinence, but when the crossing angle θ1 and the crossing angle θ2 are equal, the waist belt 17 is likely to be placed on the ventral side at a position that impedes the movement of the wearer's leg Thus, on the back side, the end of the waist belt 17 can easily bite into the buttocks of the wearer. Referring to FIG. 7A, in the conventional diaper 100, the crossing angle θ1 and the crossing angle θ2 are equal to each other, and for example, the diaper body 16 fits the buttocks of the wearer on the ventral side, If the crossing angles θ1 and θ2 are set, the diaper body 16 can not be positioned around the sacral region located above the buttocks of the wearer in the rear waist region 12 where the convex buttocks are located. Therefore, in the conventional diaper 100, the absorber 23 can not be pulled up the upper side of the body sufficiently on the back side, and the diaper main body 16 is overlapped and a gap is generated between it and the buttocks, which may cause excrement is there.

  On the other hand, in the diaper 10 of the present embodiment, since the crossing angle θ1 and the crossing angle θ2 are different from each other, the waist belt 17 does not inhibit the movement of the legs of the wearer on the ventral side, and the waist belt on the dorsal side The 17 ends can cover the buttocks of the wearer and prevent part from biting into the body. Therefore, in addition to being able to improve the fit in the low waist type diaper 10, it is possible to have an underwear-like appearance such as shorts. Referring to FIG. 7B, in the diaper 10 according to this embodiment, since the intersection angle θ1 is larger than the intersection angle θ2, when the diaper 10 is worn, the diaper body 16 is fitted to the buttocks of the wearer on the ventral side While being able to do, the diaper main body 16 can be located around a wearer's sacrum part in a back side. Therefore, the diaper body 16 can be fitted to the body without gaps on both the ventral side and the dorsal side, and the leakage of excrement can be reliably prevented.

  In order to fit the front and rear waist areas 11 and 12 to the body of the wearer, it is preferable that the crossing angle θ1 be larger than the crossing angle θ2 and the difference between the crossing angle θ1 and the crossing angle θ2 be about 5 to 20 degrees. Is more preferably about 10 to 15 degrees. Furthermore, in the low waist type diaper 10, the diaper main body 16 needs to be pulled up sufficiently on the back side, and the crossing angle θ2 is preferably about 35 degrees or less, and the crossing angle θ2 is 35 degrees or less. 10 can be made more like a shorts-like underwear look.

  Referring again to FIG. 6, since the diaper 10 has such a shape, the leg opening extends outward in the lateral direction X more than the waist opening as compared with the case where the waist belt 17 extends in parallel in the lateral direction. Therefore, when the diaper 10 is worn, it becomes easy to insert the toes. In addition, since the waist opening edge has a shape that is convexly curved downward, in the state where both legs are inserted in the leg opening, it is easy to grip the upwardly projecting side portions of the waist belt 17 and pull it upward. In addition, the width dimension W1 of the waist belt 17 is relatively small, and it is used, for example, for adult light incontinence, etc. A relatively crooked shallow row in which the waist opening is positioned below the umbilical part by a given dimension It is of the waist type (low rise type) and has a curved shape so that the waist opening as a whole is convex downward, that is, the position of the central portion in the lateral direction of the front and rear waist areas 11 and 12 is Because it is located below both sides, the upper and lower side sections have the same length dimension, and the upper section has a longer length dimension than the lower section. Can give an impressive impression and is excellent in design.

  Referring to FIG. 8, the waist elastic sheet 35 is gradually narrowed toward the central portion 35 C in the waist circumferential direction from both end portions 35 A, 35 B located on the joint lines 18 A, 18 B in the upper portion 51 of the leg opening 15. It is narrowest at the central portion (the narrowest portion) 35C. Similarly, the leg elastic sheet 27 is also gradually narrowed toward the central portion (the narrowest portion) 27C in the waist circumferential direction from both end portions 27A and 27B located on the bonding lines 18A and 8B, The width is the narrowest in the portion 27C. By the waist elastic sheet 35 and the leg elastic sheet 27 having such a shape, in the both ends 27A, 27B, 35A, 35B of both sheets positioned on the bonding line 18A, 18B side, the wearer's thighs The entire elastic sheet is formed in the same width size by stably fitting to the root and by contacting the central portions 27C and 35C to the area near the least moving hip bone and thigh of the body. It is possible to realize an appropriate fit to the body while reducing the material cost compared to the case of The widest region on the buttocks side is obtained by displacing the narrowest portion 35C of the waist elastic sheet 35 and the narrowest portion 27C of the leg elastic sheet 27 slightly forward of the central portion of each length dimension. Can be positioned so that the front part of the leg opening is larger than the rear part and is closer to the line of the leg opening of the undergarment, making it easier to fit the body with the undergarment.

  9 (a) to 9 (d) are diagrams showing a part of the manufacturing process of the diaper 10. As shown in FIG. Referring to FIG. 9A, in the composite panel 70 which is a base material of the diaper 10, the side sheet 25 and the waist sheet 30 of the diaper body 16 are integrally formed from a base sheet 71 made of a fiber non-woven fabric. . Composite panel 70 has main part 73 which becomes a substrate of diaper main part 16 by which absorber 23 is arranged, and both sides 74 which become a base of waist belt 17 located in the both sides of main part 73. The base sheet 71 is attached in a state of being folded in half at both side portions 74, and the continuous elastic bodies 77A and 77B forming the waist elastics 33 and 34 and the leg elastics 26 are disposed. Further, a continuous elastic sheet 79 formed of an elastic stretchable fiber non-woven fabric is disposed so as to overlap with a portion of the continuous elastic body 77A and the continuous elastic body 77B.

  Referring to FIG. 9 (b), next, a pair of elliptical shaped slots 75 formed by winding and extending parallel to the absorber 23 is provided between the main part 73 and the two side parts 74. . Further, a part of the both side portions 74 is bent toward the main portion 73 along the bending line 76 extending to overlap the slot 75. Also, the slot 75 can be formed by making a straight cut in a part of the base sheet 71, but in such a case, sheet breakage is likely to occur from the cut end, so that the slot 75 is formed by cutting. It is preferred to form a wide opening. In the hollowed out portion, the continuous elastic sheet 79 is positioned, and the continuous elastic sheet 79 is rolled out, whereby the waist elastic sheet 35 and the leg elastic sheet 27 are formed. As described above, in the curling process, by disposing the leg elastic sheet 27 at the leg opening edge, it is possible to abut against the wearer's thigh without any gap and to suppress leakage of excrement. Furthermore, compared with the case where the waist elastic body made of elastic yarn and the leg elastic body are arranged in plural at intervals, the leg opening edge portion can suppress the lift of the sheet and the formation of gathers. Can have a clean appearance.

  Referring to FIGS. 9 (c), (d), and FIGS. 10 (a) and 10 (b), in the heat cutting step, a portion of the base sheet 71 in which the main portion 73 and the both sides 74 are folded is paired. The diaper 10 can be manufactured by cutting along the heat cutting line 78 of The pair of thermal cutting lines 78 are positioned opposite to each other with the absorber 23 interposed therebetween, and have a substantially V shape extending obliquely from both end edges of the slot 75 toward both end edges of the base sheet 71. By changing the degree of V-shaped opening in the pair of thermal cutting lines 78, the magnitudes of the intersection angle θ1 on the bonding line 18A side and the intersection angle θ2 on the bonding line 18B are different from each other. At the time of the thermal cutting process, the stacked constituent materials 71, 77A, 77B, 79 are joined together along the thermal cutting line 78 to form bonding lines 18A, 18B. Between the side edges 16 c and 16 d of the diaper body 16 and the first side edge 17 c of the waist belt 17, a leg opening 15 formed by the slot 75 is defined. As described above, by integrally forming the side sheet 25 and the waist sheet 30 of the diaper main body 16 from one base sheet 71, the manufacturing process can be further simplified, and the manufacturing cost can be suppressed.

  In addition to the materials described in the specification, various known materials generally used in this type of article can be used without limitation for each component constituting the diaper 10 of the present invention. Also, in the specification and claims, the terms "first" and "second" are used merely to distinguish similar elements, locations, and the like.

10 diaper 11 front waist region 11C front waist region central portion 12 rear waist region 12C rear waist region central portion 13 crotch region 14 waist opening 15 leg opening 16 diaper main body 17 waist belt 18A, 18B joint line 27 leg elastic sheet 35 waist Elastic sheet 62, 64 virtual line P vertical center line X horizontal direction Y vertical direction θ1 cross angle θ2 cross angle

Claims (8)

A diaper body having a longitudinal direction and a lateral direction, a longitudinal center line bisecting the lateral dimension, a front and rear waist region, a crotch region located between the front and rear waist regions, and an absorbent body; A disposable diaper comprising a pair of waist belts for connecting the front and rear waist regions, a waist opening, and a pair of leg openings.
The pair of waist belts is joined to the diaper body via a joining line approaching the longitudinal center line from the leg opening toward the waist opening in the front and rear waist regions.
The crossing angle between a virtual line perpendicular to the waist opening and the junction line at the intersection of the waist opening and the junction line is different between the front waist region and the rear waist region.
The diaper body includes a liquid-permeable inner layer sheet, a liquid-impervious outer layer sheet, the absorber located between the inner and outer layer sheets, and a pair of members extending outward in the lateral direction from the absorber. Including side sheets,
The side sheet is located in a direction crossing the joining line , and is joined to the waist belt via the joining line, and is fixed between the absorber and the outer layer sheet Said diaper characterized in that.   The diaper according to claim 1, wherein the crossing angle in the front waist region is larger than the crossing angle in the rear waist region.   The diaper according to claim 1 or 2, wherein in the contracted state, the waist belt extends obliquely with respect to the longitudinal center line, and the waist opening edge has a shape which is convex downward.   The apparatus further includes a horizontal center line bisecting the longitudinal dimension, and bending along the horizontal center line to bring the inner surfaces of the front and rear waist regions into contact with each other and in a contracted state The diaper according to any one of claims 1 to 3, wherein the lateral central portion of the front waist region and the lateral central portion of the rear waist region do not overlap with each other.   The diaper according to any one of claims 1 to 4, wherein the crossing angle in the front waist region is 20 to 70 degrees, and the crossing angle in the rear waist region is 10 to 60 degrees.   The diaper according to any one of claims 1 to 5, wherein the waist belt is joined to the skin facing surface side of the diaper body.   The diaper according to any one of claims 1 to 6, wherein a waist elastic sheet extending along the leg opening edge is disposed in the waist belt.   The leg opening edge has an upper portion extending from a lower end edge on the front waist region side of the waist belt to a lower end edge on the rear waist region side, and the waist elastic sheet has a width dimension at a central portion of the upper portion The diaper according to claim 7, wherein is smaller than the width dimension of the lower end of the joining line.

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