JP2011104001A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article wherein a leakage prevention wall is not easily brought down inward, a high leakage prevention property is presented and the texture of the leakage prevention wall is excellent. <P>SOLUTION: The leakage prevention wall 5 includes a base wall portion 51 which can be raised along a longitudinal direction X of the main body, on the skin abutting surface side of an absorbent body 10, and a flat elastic extension/contraction portion 52 connected to the upper end part of the base wall portion 51 to abut on the skin of a wearer. At the front end part and rear end part in the longitudinal direction X of the leakage prevention wall 5, the elastic extension/contraction portion 52 is fixed to the absorbent body 10 and an end part elastic extension/contraction portion fixing part 53 is formed. In the longitudinal direction center area of the leakage prevention wall 5, a center area elastic extension/contraction portion fixing part 54 configured similarly to the end part elastic extension/contraction portion fixing part 53 is locally formed. The fixing part 54 is formed at the center part in the width direction excluding both side edge parts 52sa and 52sb of the elastic extension/contraction portion 52 and both side edge parts 52sa and 52sb are not fixed to other members. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an absorbent article such as a sanitary napkin, a panty liner (cage sheet), and an incontinence pad.

  As an absorbent article such as a sanitary napkin, a substantially vertically long absorbent main body having a liquid-retaining absorbent body and a pair of leak-proof walls disposed on both side portions along the longitudinal direction of the absorbent main body The one with is known. In the conventional leak-proof wall structure, a leak-proof wall-forming sheet extending in the longitudinal direction of the main body is joined to the top sheet that forms the skin contact surface of the absorbent article. Generally, elastic members extending in the longitudinal direction of the main body are joined in an extended state. The leak-proof wall has a front end portion and a rear end portion in the longitudinal direction of the main body fixed to the absorbent main body, an elastic contraction force in the longitudinal direction of the main body is applied, and between the front end portion and the rear end portion, It stands up toward the user's skin side, thereby preventing leakage of body fluid at the side of the absorbent article.

  In the conventional absorbent article provided with the leak-proof wall, the standing leak-proof wall falls down toward the skin contact surface side of the absorbent main body by receiving pressure from the wearer's body when worn. The skin contact surface of the absorbent main body may be covered. Such inward tilting of the leak-proof wall reduces the substantial liquid absorption region on the skin contact surface of the absorbent main body, and may cause leakage of body fluid.

  As a technique for preventing the leak-proof wall from falling down, for example, Patent Document 1 has a stand-up leak-proof wall composed of a base wall portion and a planar elastic stretchable portion connected to the upper end portion of the base wall portion. In the absorbent article having the excretion part facing part disposed opposite to the excretion part of the wearer when worn and the rear part arranged on the back side of the excretion part facing part in the longitudinal direction, the excretion part facing It is described that a central fixing portion is formed between the portion and the rear portion, in which the elastic stretchable portion is fixed to the absorbent main body and the base wall portion is prevented from rising.

  Moreover, in patent document 2, the standing height of the leak-proof wall was regulated lower than other parts in the longitudinal center region sandwiched between the front end portion and the rear end portion in the main body longitudinal direction of the leak-proof wall. An absorbent article is described in which a restricting portion (central fixing portion) is locally provided. This restricting portion is formed by folding and joining a part of the sheet material between the rising base end and the top of the leak-proof wall, and is said to be effective for preventing the leak-proof wall from falling down. Yes.

JP 2003-245306 A JP 2004-358109 A

  FIG. 9 shows an example of the central fixing portion formed in the longitudinal central region of the leak-proof wall in the conventional absorbent articles as described in Patent Documents 1 and 2, and FIG. The top view which shows typically the skin contact surface side of a center fixing | fixed part, FIG.9 (b) is sectional drawing which shows typically the III-III line cross section of Fig.9 (a). A leak-proof wall 90 shown in FIG. 9 includes a base wall portion 91 that can stand along the longitudinal direction X of the absorbent main body 100 on the skin contact surface side of the absorbent main body 100, and an upper end portion of the base wall portion 91. It is comprised including the planar elastic expansion-contraction part 92 connected to 91a and contact | abutting a wearer's skin at the time of wear. An elastic member 95 is disposed along the longitudinal direction X of the elastic stretchable portion 92 to impart elastic stretchability. The center fixing portion 94 is locally formed in the central region in the longitudinal direction of the leak-proof wall 90, and the elastic stretchable portion 92 is applied to the skin of the absorbent main body 90 via the folded base wall portion 91. The base wall 91 is prevented from standing up due to being fixed to the contact surface.

  The center fixing part 94 heats and presses the inner part (the hatched part in FIG. 9A) of the elastic expansion / contraction part 92 near the inner edge 92sa from the skin contact surface side of the inner part. And is heat-sealed on the absorbent main body 90 via the base wall portion 91. By this heat and pressure treatment, the skin contact surface 94a of the central fixing portion 94 is made of constituent fibers. It is melted to form a film with fine irregularities. Therefore, the skin contact surface 94a of the center fixing portion 94 is rough, and the flexibility is impaired, so that it is harder than the other portions and has a poor touch. In addition, the center fixing | fixed part in the absorbent article of patent document 1 is formed in the full width of the elastic expansion-contraction part 92 ranging from the inner edge part 92sa to the outer edge part 92sb in FIG. 5).

  The center fixing portion 94 needs to be formed in the central region in the longitudinal direction of the leak-proof wall 90 from the viewpoint of preventing the leak-proof wall 90 from falling down. The skin contact surface is a portion that is easy to directly contact the user's skin when the absorbent article is used, and a part of the skin contact surface is the skin contact surface 94a of the center fixing portion 94 having a poor touch. In addition, there is a risk of inconvenience such as a decrease in wearing feeling and skin troubles due to rubbing of the skin. Further, the skin contact surface 94a of the central fixing portion 94 is in the form of a film so that bodily fluids can easily flow thereover, and is close to the excretory portion of the user when in use, and the inner edge of the elastic stretchable portion 52 Since 92sa is continuously formed outward in the width direction Y, the excreted body fluid may flow on the film-like skin contact surface 94a and leak outward in the width direction Y. . There has not yet been provided an absorbent article that achieves both the prevention of the leakproof wall from falling down and the good touch of the leakproof wall.

  Accordingly, an object of the present invention is to provide an absorbent article in which the leakproof wall is unlikely to fall down, exhibits high leakproofness, and has a good feel to the leakproof wall.

  The present invention is an absorptive comprising a substantially vertically long absorbent main body having a liquid-retaining absorbent body and a pair of leak-proof walls disposed on both sides along the longitudinal direction of the absorbent main body. The leak-proof wall is an article that is connected to the skin contacting surface side of the absorbent main body along the longitudinal direction of the main body and is connected to the upper end of the base wall and is worn when worn. The elastic elastic part is fixed to the absorbent main body at each of the front end part and the rear end part in the longitudinal direction of the main body of the leak-proof wall. In addition, the elastic elastic part is formed in the longitudinal central region of the leak-proof wall sandwiched between the front end part and the rear end part. A central elastic elastic part fixing part, which is fixed to the main body and the standing of the base wall part is inhibited, is locally formed. The central elastic elastic part fixing part is formed at the central part in the width direction of the elastic elastic part excluding both side edges along the body longitudinal direction of the elastic elastic part. The problem is solved by providing an absorbent article that is not fixed to a member.

  In the absorbent article of the present invention, the inner wall of the leak-proof wall is unlikely to fall, the high leak-proof property is expressed, the touch of the leak-proof wall is good, and the wearing feeling is excellent.

FIG. 1 is a plan view schematically showing a skin contact surface side (surface sheet side) of a sanitary napkin that is an embodiment of the absorbent article of the present invention. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. 3 is a cross-sectional view schematically showing a cross section taken along line II-II in FIG. 4A is an enlarged plan view schematically showing the skin contact surface side of the central elastic stretchable part fixing portion in the napkin shown in FIG. 1, and FIG. 4B is a plan view of FIG. 4A. It is sectional drawing which shows a III-III line cross section typically. FIG. 5A to FIG. 5C are views corresponding to FIG. 4A of other embodiments of the mid-range elastic stretchable part fixing portion according to the present invention, respectively. 6 (a) is a view corresponding to FIG. 4 (a) of still another embodiment of the mid-range elastic stretchable part fixing portion according to the present invention, and FIG. 6 (b) is a line III-III in FIG. 6 (a). It is sectional drawing which shows a cross section typically. FIG. 7 (a) is a view corresponding to FIG. 4 (a) of still another embodiment of the central elastic stretchable part fixing portion according to the present invention, and FIG. 7 (b) is a line III-III in FIG. 7 (a). It is sectional drawing which shows a cross section typically. 8 (a) to 8 (e) are views corresponding to FIG. 4 (a) of still another embodiment of the mid-range elastic stretchable part fixing portion according to the present invention. FIG. 9A is an enlarged plan view schematically showing the skin contact surface side of the central fixing portion of the leak-proof wall in the conventional absorbent article, and FIG. 9B is a plan view of FIG. 9A. It is sectional drawing which shows a III-III line cross section typically.

  Hereinafter, the absorbent article of this invention is demonstrated with reference to drawings based on the sanitary napkin which is one preferable embodiment. As shown in FIGS. 1 and 2, the napkin 1 of the present embodiment includes a substantially vertically long absorbent main body 10 having a liquid retaining absorbent body 4, and both sides along the longitudinal direction of the absorbent main body 10. And a pair of leak-proof walls 5 and 5 disposed in each part.

  If it demonstrates further, the napkin 1 will be the excretory part opposing part A arrange | positioned facing a user's excretion part at the time of use, and the rear part distribute | arranged to a user's back side (rear) rather than the excretion part opposing part A at the time of use. B, a front end portion C that forms a front end portion of the napkin 1 in the main body longitudinal direction X, and a rear end portion D that forms a rear end portion of the main body longitudinal direction X of the napkin 1 are provided in the longitudinal direction. As shown in FIG. 2, the absorbent main body 10 includes a top sheet 2 that forms a skin contact surface of the napkin 1, a back sheet 3 that forms a non-skin contact surface of the napkin 1, and a space between the two sheets 2 and 3. 1 and has an elongated shape (substantially rectangular shape) in one direction in a plan view as shown in FIG.

  In the present specification, the skin contact surface is a surface of the absorbent article or a component thereof that faces the wearer's skin when the absorbent article is worn, and the non-skin contact surface is the absorbent article. Alternatively, it is a surface of the member that is directed to the side opposite to the skin side (clothing side) when the absorbent article is worn. Moreover, a longitudinal direction is a direction along the long side of an absorbent article or its structural member, and a width direction is a direction orthogonal to this longitudinal direction. In the figure, the direction indicated by the symbol X is the longitudinal direction (main body longitudinal direction) of the absorbent main body, and the direction indicated by the symbol Y is the width direction (main body width direction) of the absorbent main body.

  In the present embodiment, as shown in FIG. 2, both side edges 2 s and 2 s along the body longitudinal direction X of the topsheet 2 are in the body width direction more than both side edges 4 s and 4 s along the body longitudinal direction X of the absorbent body 4. It is located inward of Y, and the topsheet 2 is within a region sandwiched between the side edges 4 s and 4 s of the absorber 4. The side edge 4s of the absorber 4 is an edge that protrudes most in the main body width direction Y in the absorber 4. In the conventional absorbent article, the surface sheet extends outward in the width direction beyond both side edges along the longitudinal direction of the absorbent body, and both side edges along the longitudinal direction of the surface sheet extend along the longitudinal direction of the absorbent body Although there are some which are located outward in the width direction from both side edges, in such a configuration, the excreted body fluid moves outward in the width direction of the absorbent body through the surface sheet, and the body fluid in the side portion Where the side edges 2s, 2s of the topsheet 2 are located more inward in the body width direction Y than the side edges 4s, 4s of the absorbent body 4 as in this embodiment. Although not shown, if both side edges 2s, 2s of the top sheet 2 are in the same position as both side edges 4s, 4s of the absorbent body 4, such disadvantages of the prior art are avoided, and the configuration of the napkin Reduction of the usage amount of members and reduction of manufacturing costs can be achieved. From the viewpoint of ensuring the above-described effects, the side edge 2s of the topsheet 2 is spaced from the side edge 4s of the absorbent body 4 inward in the body width direction Y by 0 mm or more, particularly 0.5 to 4 mm. It is preferable to exist in the position.

  As shown in FIG. 2, the back sheet 3 covers the entire area of the non-skin contact surface of the absorbent body 4, and further extends outward from the side edges 4 s and 4 s of the absorbent body 4 in the body width direction Y. A flap portion 6 is formed. As shown in FIG. 1, the side flap portion 6 projects greatly outward in the body width direction Y at the excretory portion facing portion A, whereby a pair of wing portions 7 are provided on both left and right sides of the absorbent body 10. , 7 are extended. Further, the side flap portion 6 also protrudes outward in the main body width direction Y also in the rear portion B, whereby a pair of rear flap portions 8 and 8 extend on both the left and right sides of the absorbent main body 10. Has been. Further, as shown in FIG. 1, the top sheet 2 and the back sheet 3 extend outward in the main body longitudinal direction X from the front end and the rear end in the main body longitudinal direction X of the absorbent body 4, They are joined together by a known joining means such as an adhesive or heat seal to form an end seal part.

  As shown in FIGS. 1 and 2, the absorbent body 4 has middle and high portions 41 and 42 that protrude on the skin contact surface side in the central region in the body width direction Y. More specifically, the absorber 4 includes a lower-layer absorber 40 having a substantially rectangular shape with rounded corners in plan view, and a width narrower than the lower-layer absorber 40 and the width direction of the lower-layer absorber 40. It has the front middle-high part 41 and the rear middle-high part 42 as an upper layer absorber which protrudes to the skin contact surface side of the center part of Y. The front middle-high part 41 is arranged in the excretory part facing part A, the rear middle-high part 42 is arranged in the rear part B, and both the middle high parts 41, 42 are arranged at a predetermined interval in the main body longitudinal direction X. With such a configuration of the upper-layer absorbent body, the central portion in the width direction on the skin contact surface side of the napkin 1 is a bulky middle-high portion compared to other portions. The absorbent body 4 (the lower layer absorbent body 40, the front middle-high section 41, the rear middle-high section 42) and the top sheet 2 may be joined by a known joining means such as an adhesive or heat seal.

  As shown in FIGS. 1 and 2, the pair of leak-proof walls 5, 5 are arranged along the body longitudinal direction X on the skin contact surface (skin contact surface 2 a of the topsheet 2) side of the absorbent main body 10. The base wall 51 can stand upright, and the elastic elastic portion 52 is connected to the upper end 51a of the base wall 51 and contacts the wearer's skin when worn. The elastic stretchable part 52 extends along the longitudinal direction X of the absorbent main body 10 over substantially the entire length thereof. A plurality of elastic members 15 are arranged in the elastic stretchable part 52 along the longitudinal direction X of the main body, and are provided with elastic stretchability. The expansion / contraction direction of the leak-proof wall 5 (elastic expansion / contraction part 52) corresponds to the longitudinal direction X of the main body. The elastic member 15 is arranged in the whole area of the excretion part opposing part A and the substantially whole area of the rear part B (the part near the excretion part opposing part A in the rear part B).

  The leak-proof wall 5 will be further described. The leak-proof wall 5 includes a side sheet 50 having a certain width in the main body longitudinal direction X, and the side sheet 50 has a base wall as shown in FIG. The part 51 and its upper end part 51a are folded back so as to have a shape in which an elastic expansion / contraction part 52 is continuously provided. Therefore, the leak-proof wall 5 formed by folding back the side sheet 50 has a two-layer structure in the base wall portion 51 and the elastic stretchable portion 52 as shown in FIG. The side sheets 50 and 50 constituting the two-layer structure are joined by an adhesive (not shown).

  As shown in FIG. 2, the base wall 51 is joined to the skin contact surface 2 a of the topsheet 2 along the longitudinal direction X of the main body above the absorber 4, and at least the excretory part facing part A and the rear In the part B (however, excluding the central elastic elastic part fixing part 54 described later), the joint part 13 is set as a starting point so as to stand up toward the user's skin when used. Further, the base wall portion 51 has its lower end portion 51b side wound down to the non-skin contact surface side of the absorbent body 4 and is interposed between the absorbent body 4 and the back sheet 3 so as to be adhesive, heat seal, etc. It is fixed by known joining means.

  As described above, when the base wall portion 51 stands up with the joint portion 13 positioned above the absorber 4 as a starting point, for example, as shown in FIG. However, the rising start point is higher than the case where it is set to start from a joint located on the outer side of the absorbent body in the width direction and substantially flush with the non-skin contact surface of the absorbent body. And the upper end of the upright part are short enough to correspond to the thickness of the absorber, so that the base wall part is less likely to fall down during use, and the predetermined leak-proof effect by the leak-proof wall is more reliably achieved. Become so.

  The joint portion 13 between the base wall portion 51 and the top sheet 2 is linear in a plan view and extends along the main body longitudinal direction X over the entire length of the absorbent main body 10. The linear joint 13 may be a continuous line in which the adhesive is continuously applied along the longitudinal direction X of the main body, or may be a broken line in which the adhesive is applied discontinuously. It can be straight or curved. The linear joint part 13 in this embodiment is a straight line and a continuous line.

  The elastic expansion / contraction portion 52 includes an inward elastic expansion / contraction portion 52A projecting substantially horizontally from the upper end portion 51a of the base wall portion 51 inward in the main body width direction Y, and substantially horizontal from the upper end portion 51a outward in the main body width direction Y. It is comprised from the outward elastic expansion-contraction part 52B which protrudes to the surface of the user at least in the excretion part opposing part A. One or more elastic members 15 are arranged in each of the inward elastic expansion / contraction part 52A and the outward elastic expansion / contraction part 52B to give elastic elasticity. The elastic member 15 is arranged in a stretched state between the two layers of side sheets 50 and 50 constituting the inner elastic expansion / contraction part 52A and the outer elastic expansion / contraction part 52B, and is attached to both side sheets by an adhesive (not shown). , 50 are joined. As described above, in this embodiment, the inner elastic expansion / contraction part 52A and the outer elastic expansion / contraction part 52B are integrally formed in a planar shape, and are positioned above the joint part 13 in the base wall part 51. Together with the portion to be raised, it stands up so as to form a T shape in a sectional view along the body width direction Y.

  The ratio of the overhanging width of the inward elastic expansion / contraction part 52A to the overhanging width of the outward elastic expansion / contraction part 52B (the former: the latter) is preferably 4: 1 from the viewpoint of stable formation of the surface shape by a T-shape in cross section. 1: 4, more preferably 7: 3 to 3: 7. Further, the length from the free end along the main body longitudinal direction X of the inner elastic stretchable portion 52A to the free end along the main body longitudinal direction X of the outer elastic stretchable portion 52B, that is, the planar elastic stretchable portion 52 The width W (see FIG. 2) is preferably 13 to 25 mm, particularly preferably 15 to 23 mm, from the viewpoint of fit and leakage prevention.

  As shown in FIG. 1, the front end in the main body longitudinal direction X of the leak-proof wall 5 located at the front end C of the napkin 1 and the rear of the main body longitudinal direction X in the leak-proof wall 5 located at the rear end D The elastic elastic part 52 is fixed to the absorptive main body 10 and an elastic elastic part fixing part 53 is formed at the end part. As shown in FIG. 3, the end elastic stretchable portion fixing portion 53 constitutes the absorbent main body 10 through a base wall portion 51 in which at least the inner elastic stretchable portion 52 </ b> A of the elastic stretchable portion 52 is folded. It is formed by being joined to the surface sheet 2 by a known joining means such as an adhesive or heat seal. In the present embodiment, the end elastic stretchable portion fixing portion 53 heats and presses (heat seals) the inner elastic stretchable portion 52A from the skin contact surface side, and is placed on the absorbent main body 10 via the base wall portion 51. It is formed by heat sealing. In the end elastic expansion / contraction part fixing | fixed part 53, standing of the base wall part 51 is inhibited.

  In the central region in the longitudinal direction of the leak-proof wall 5 sandwiched between the front end portion and the rear end portion of the leak-proof wall 5, the elastic stretchable portion 52 absorbs except for the central-region elastic stretchable portion fixing portion 54 described later. The base wall 51 is not fixed to the sex main body 10, and is erected by the contraction force of the elastic member 15. The central area in the longitudinal direction of the leak-proof wall 5 substantially coincides with the excretory part facing part A and the rear part B. Further, due to the contraction of the elastic stretchable portion 52, the entire shape of the absorbent main body 10 in the main body longitudinal direction X is curved in a concave shape on the skin contact surface side (surface sheet 2 side).

  As shown in FIG. 1, the elastic stretchable portion 52 is fixed to the absorbent main body 10 and the base wall 51 is prevented from standing up in the central region in the longitudinal direction of the leak-proof wall 5. The fixed part 54 is formed locally. One central elastic stretchable part fixing part 54 is formed at a predetermined position of the rear part B in each of the pair of elastic stretchable parts 52, 52 arranged on the left and right sides of the absorbent main body 10. Similarly to the end elastic stretchable part fixing part 53, the central elastic stretchable part fixing part 54 heats and presses (heat seals) a predetermined portion of the elastic stretchable part 52 from the skin contact surface side, and thereby the base wall part 51. It is formed by heat-seal | fusing on the absorptive main body 10 via. As shown in FIG. 1, the central region elastic expansion / contraction portion fixing portion 54 has a rhombus shape in a plan view, and the entire region of the rhomboid central region elastic expansion / contraction portion fixing portion 54 is a heat-pressed seal portion. Yes, it is a fixing part of the elastic stretchable part 52 to the absorbent main body 10. The skin contact surface 54a of the central elastic expansion / contraction part fixing part 54 is not in the form of a fiber by melting the constituent fibers by this heating and pressurizing process, and is in the form of a film in which fine irregularities are formed. Therefore, compared with the other part of the elastic expansion-contraction part 52, smoothness and a softness | flexibility are falling.

  In this manner, the base wall 51 is prevented from standing in the longitudinal central region of the leak-proof wall 5 sandwiched between the pair of end elastic stretchable portion fixing portions 53 and 53 positioned in the front and rear of the main body longitudinal direction X. Since the central area expansion / contraction part fixing part 54 is locally formed, the degree of freedom of movement in the body width direction Y of the base wall part 51 standing before and after the central area expansion / contraction part fixing part 54 is increased. Thus, the fall of the leakproof wall 5 to the skin contact surface side of the absorbent main body 10 (inward fall) and the leakage of bodily fluid resulting therefrom are effectively prevented.

  From the viewpoint of preventing inward collapse more reliably, the central stretchable portion fixing portion 54 is within 40 mm from the virtual straight line P when a virtual straight line P (see FIG. 1) that bisects the napkin 1 in the body longitudinal direction X is drawn. In particular, it is preferably formed in a region on the rear end side of the main body longitudinal direction X of the napkin 1 with respect to the virtual straight line P and within a region within 40 mm from the virtual straight line P.

  4A is an enlarged plan view schematically showing the skin contact surface side of the central elastic stretchable part fixing portion 54, and FIG. 4B is a III-III line in FIG. 4A. A cross-sectional view schematically showing the cross section is shown. As shown in FIG. 4, the central elastic stretchable portion fixing portion 54 includes the elastic stretchable portion 52 excluding both side edges (inner edge portion 52 sa and outer edge portion 52 sb) along the longitudinal direction X of the elastic stretchable portion 52. The side edges 52sa and 52sb are not fixed to other members. In this way, only the central portion in the width direction of the elastic stretchable portion 52 is fixed to the absorbent main body 10 (surface sheet 2) via the base wall portion 51, and the edge portions 52sa and 52sb located on the left and right sides thereof are the other. 4a, the both side edges 52sa and 52sb are directed upward (to the user's skin side in use) as shown in FIG. And rises to the skin side of the skin contact surface 54a of the central elastic stretchable part fixing part 54.

  The skin contact surface 54a of the central elastic stretchable part fixing part 54 has a film-like shape in which fine irregularities are formed, is rough, and is less flexible and harder than other parts. As shown in FIG. 4 (b), the skin contact is caused by the inner edge 52sa and the outer edge 52sb located on the left and right sides of the skin contact surface 54a standing on the skin side. Since the surface 54a sinks relatively to the non-skin side, it is difficult to hit the user's skin. Therefore, according to the napkin 1 of the present embodiment, inconvenience caused by the central fixing portion, which is a concern with the absorbent article having the conventional central fixing portion as shown in FIG. It is possible to achieve both the prevention of falling and the good touch of the leak-proof wall at a high level.

  From the viewpoint of balance between prevention of inward collapse of the leak-proof wall 5 and good touch of the leak-proof wall 5, it is preferable that the central elastic stretchable part fixing part 54 is formed as follows. That is, the length L1 (see FIG. 4A) along the main body longitudinal direction X in the plan view of the central elastic stretchable part fixing part 54 is preferably 7 to 18 mm, more preferably 10 to 15 mm. Moreover, length W1 (refer FIG. 4A) in the main body width direction Y in planar view of the center area elastic expansion-contraction part fixing | fixed part 54 becomes like this. Preferably it is 9-20 mm, More preferably, it is 10-18 mm. The ratio (W1 / W) between the length W1 and the width W of the elastic stretchable part 52 (see FIGS. 2 and 4A) is preferably 0.25 to 0.8, more preferably 0.4. ~ 0.7. Further, it is preferable that the center region elastic expansion / contraction portion fixing portion 54 is formed at a position 2 mm away from each of the inner edge portion 52sa and the outer edge portion 52sb, particularly 2.5 to 5 mm.

  As shown in FIG. 4A, the central region elastic stretchable portion fixing portion 54 has a rhombus shape in plan view, and the body width starts from a virtual straight line Q that bisects the elastic stretchable portion 52 in the body width direction Y. The length L1 along the longitudinal direction X of the main body is shortened as it goes in both the outward and inward directions of the direction Y. By forming the central region elastic expansion / contraction portion fixing portion 54 in the plan view as described above, for example, as shown in FIG. Since the degree of freedom of the region located between the central region elastic expansion / contraction portion fixing portion 54 and the inner edge portion 52sa and the outer edge portion 52sb increases in the portion 52, to the skin side of the inner edge portion 52sa and the outer edge portion 52sb As a result, the above-mentioned effects are more reliably exhibited.

  The napkin 1 of the present embodiment will be further described. As shown in FIG. 1, the napkin 1 overlaps with the absorbent body 4 in a plan view of the napkin 1 on the skin contact surface (skin contact surface 2 a of the topsheet 2). In the region, a linear groove portion 9 in which the top sheet 2 and the absorber 4 are integrally recessed toward the back sheet 3 is formed. In the groove portion 9, the topsheet 2 and the absorber 4 are integrated by heat fusion or the like. The groove 9 is formed so as to surround each of the front middle-high part 41 and the rear middle-high part 42. As described above, the groove 9 in which the topsheet 2 and the absorbent body 4 are integrated is formed on the skin contact surface side of the napkin 1, so that the liquid diffusion in the planar direction of the absorbent body 4 is effective. In addition, the absorber 4 can be prevented from being twisted. The formation of the groove 9 is particularly effective for preventing diffusion of excretory fluid such as menstrual blood and improving adhesion to the body when worn. The groove 9 can be formed according to a conventional method by embossing such as embossing with or without heat, or ultrasonic embossing.

  When the formation material of each part in the napkin 1 is demonstrated, the various things conventionally used in the said technical field can be especially used as the surface sheet 2 and the back surface sheet 3 without a restriction | limiting. As the surface sheet 2, for example, liquid permeable sheets such as various nonwoven fabrics and perforated films subjected to a hydrophilic treatment can be used. Further, the back sheet 3 may be liquid-impermeable or liquid-permeable, for example, a resin film that does not have moisture permeability, a resin film that has micropores and has moisture permeability, a nonwoven fabric such as a water-repellent nonwoven fabric, A laminate with other sheets can be used.

  As materials constituting the absorber 4 (the lower layer absorber 40 and the upper layer absorber 41), various materials conventionally used in the technical field can be used without particular limitation, and examples thereof include wood pulp, synthetic fiber, and the like. A fiber aggregate composed of the above-mentioned hydrophilic fibers, or a fiber aggregate in which particulate superabsorbent resin is held can be used. The absorbent body 4 includes a liquid-retaining absorbent core (not shown) made of the fiber assembly and the like, and a liquid-permeable core wrap sheet (not shown) that covers the absorbent core. In this case, the absorbent core and the core wrap sheet may be joined to each other by a joining means such as a hot-melt pressure-sensitive adhesive at a predetermined site. As a core wrap sheet which coat | covers an absorptive core, paper, such as tissue paper, various nonwoven fabrics, an apertured film, etc. can be used, for example.

  As the side sheet 50 constituting the leak-proof wall 5 (base wall portion 51, elastic expansion / contraction portion 52), various types conventionally used in the technical field can be used without particular limitation. A nonwoven fabric, a sheet made of a resin film, a laminate of a nonwoven fabric and a resin film, or the like can be used. In particular, it is preferable to use a water-repellent air-through non-woven fabric from the viewpoint of touch and prevention of lateral leakage. In addition, as the elastic member 15 arranged in the elastic expansion / contraction part 52, various members conventionally used in the technical field can be used without particular limitation, and may be thread-like or belt-like.

  The napkin 1 of the present embodiment is used by being attached to an undergarment in the same manner as a sanitary napkin having a known wing part. According to the napkin 1 of the present embodiment, since the center region elastic expansion / contraction portion fixing portion 54 locally formed in the center region in the longitudinal direction of the leakage prevention wall 5 prevents the leakage prevention wall 5 from falling down, The predetermined leak-proof effect by the leak wall 5 is sufficiently exhibited, and high leak-proof property is obtained. In particular, in the napkin 1 of the present embodiment, the base wall portion 51 stands up with the joint portion 13 positioned above the absorber 4 as a starting point, so that the function and effect of the central elastic stretchable portion fixing portion 54 are achieved. Combined with, it is difficult to fall down.

  Further, in the napkin 1 of the present embodiment, there is a concern about a decrease in wearing feeling due to the poor touch of the skin contact surface 54a of the central region elastic stretchable portion fixing portion 54. Is formed at the center in the width direction of the elastic stretchable part 52 excluding the side edges 52sa and 52sb of the elastic stretchable part 52, and the side edges 52sa and 52sb are not fixed to other members. Sometimes, both side edges 52sa and 52sb stand up toward the user's skin, and the skin contact surface 54a of the central elastic stretchable part fixing part 54 sandwiched between them sinks relatively to the non-skin side. . Therefore, in the formation area of the central elastic stretchable portion fixing portion 54, both side edge portions 52sa and 52sb of the elastic stretchable portion 52 come into positive contact with the user's skin, and the skin contact surface 54a is the user's skin. It is difficult to hit directly. Therefore, in the napkin 1 of the present embodiment, a decrease in wearing feeling due to the central elastic elastic portion fixing portion 54 is sufficiently suppressed.

  Further, the skin contact surface 54a of the central elastic stretchable portion fixing portion 54 is in the form of a film so that bodily fluids can easily flow on the skin contact surface 54a. Are formed only in the central portion in the width direction of the elastic stretchable portion 52, excluding both side edge portions 52sa and 52sb, and from the inner edge portion 92sa in the body width direction Y as in the conventional product shown in FIG. Therefore, in the napkin 1 of the present embodiment, the excreted body fluid flows on the skin contact surface 54a and leaks outward in the body width direction Y. hard.

  The center region elastic stretchable part fixing part according to the present invention is not limited to the above-described embodiment, and various forms can be adopted without departing from the gist of the present invention. Below, with reference to FIGS. 5-8, other embodiment of the center area elastic expansion-contraction part fixing | fixed part which concerns on this invention is described. In other embodiments to be described later, constituent parts different from the above-described embodiments will be mainly described, and the same constituent parts are denoted by the same reference numerals and description thereof will be omitted. The description of the above embodiment is applied as appropriate to components that are not particularly described. In addition, below, although the left side along the main body longitudinal direction of an absorbent article is mainly demonstrated, unless otherwise indicated, the right side is comprised similarly to the left side.

  In the embodiment described above, the central elastic stretchable part fixing part 54 has a rhombus shape in plan view in order to improve the standing property of the inner edge part 52sa and the outer edge part 52sb, but as shown in FIG. Even if it is oval, the same effect is produced. The elliptical central region elastic stretchable part fixing portion 61 is similar to the rhombus-shaped one, with the virtual straight line Q that bisects the elastic stretchable part 52 in the body width direction Y as the starting point and the outer and inward directions of the body width direction Y. The length L1 along the longitudinal direction of the main body is shortened toward each of the two directions.

  5B is formed so as not to straddle the elastic member 15 in the main body width direction Y, that is, not to overlap the elastic member 15. More specifically, the central elastic stretchable part fixing part 62 is fixed to the absorbent main body 10 of the elastic stretchable part 52 formed in a linear shape extending in the main body longitudinal direction X along the elastic member 15 in plan view. A plurality of parts 62a (five in FIG. 5B) are gathered together, and the linear fixing parts 62a and the elastic members 15 are alternately arranged in the body width direction Y. In the case where the central region elastic expansion / contraction portion fixing portion is formed so as to straddle the elastic member 15 in the body width direction Y, in order to avoid breakage of the central region elastic expansion / contraction portion fixing portion due to expansion / contraction of the elastic member 15, Although it is necessary to strengthen the fixation of the expansion / contraction part 52 to the absorbent main body 10, if such strong fixation is adopted, the central region elastic expansion / contraction part fixing part becomes harder, leading to further deterioration of the touch. There is a fear. Therefore, as shown in FIG. 5 (b), such inconvenience can be avoided by forming the elastic elastic member 15 so as not to straddle the main body width direction Y. If a slight bulge is formed by the elastic member 15, it can be formed so as not to directly touch the fixed portion.

  Further, the central elastic stretchable part fixing part 62, which is configured by collecting a plurality of linear fixing parts 62a, has a rhombus shape as shown in FIG. 5B. Therefore, the inner edge 52sa and the outer edge 52sb can easily stand on the skin side of the user when in use, similarly to the central elastic elastic part fixing part 54 shown in FIG. it can.

  5 (c), 1) The overall shape in plan view is a rhombus shape (in the plan view, starting from the imaginary straight line Q, the outer and inner sides of the body width direction Y). The length L1 along the longitudinal direction of the main body is shortened in both directions), and 2) the elastic member 15 is formed so as not to straddle the main body width direction Y. ) A plurality of fixing portions 63a of the elastic stretchable portion 52 and the absorbent main body 10 formed in a dot shape in plan view are assembled. The central region elastic expansion / contraction portion fixing portion 63 having the configuration of 3) is a central region elastic expansion / contraction portion fixing portion 61 shown in FIG. The central region elastic expansion / contraction portion fixing portion, which is a fixing portion of the portion 52 to the absorbent main body 10, or the central region elastic expansion / contraction portion fixing portion 62 (a set of linear fixing portions 62a) shown in FIG. Compared to the body elastic stretchable part fixing part), since there are few fixing parts with the absorbent main body 10, it is excellent in flexibility and soft to the touch.

  Each of the above-described central elastic stretchable part fixing parts 54, 61, 62, and 63 has a symmetrical shape across a virtual straight line Q that bisects the elastic stretchable part 52 in the body width direction Y in plan view. 6 and 7, the shape may be asymmetrical. The left-right symmetry of the shape of the central region elastic expansion / contraction portion fixing portion in plan view affects the standing property of the inner edge portion 52sa and the outer edge portion 52sb on the skin side.

  As shown in FIG. 6A, the central region elastic expansion / contraction portion fixing portion 64 shown in FIG. 6 has a length L1 along the longitudinal direction X of the main body that decreases from the inner edge portion 52sa toward the outer edge portion 52sb. Yes. Therefore, the outer edge 52sb side has a smaller area for fixing the elastic expansion / contraction part 52 to the absorbent main body 10 than the inner edge 52sa side, and as shown in FIG. The part 52sb is more likely to stand on the skin side than the inner edge part 52sa. In FIG. 6B, for ease of explanation, the inner edge portion 52sa is described as not standing up to the skin side, but it is actually standing up.

  As shown in FIG. 7 (a), the central region elastic expansion / contraction portion fixing portion 65 shown in FIG. 7 is opposite to the central region elastic expansion / contraction portion fixing portion 64 shown in FIG. 6 from the outer edge portion 52sb to the inner edge portion 52sa. The length L1 along the longitudinal direction X of the main body is shortened as it goes to. Therefore, as shown in FIG.7 (b), the inner side edge part 52sa tends to stand to the skin side rather than the outer side edge part 52sb. In FIG. 7B, for ease of explanation, the outer edge portion 52sb is described as not standing up to the skin side, but it is actually standing up.

  8A to 8E are formed by appropriately combining the characteristic portions of the above-described central region elastic stretchable portion fixing portions. The central region elastic expansion / contraction portion fixing portion 66 shown in FIG. 8A has a substantially rectangular shape in plan view, and the configuration shown in FIG. It is substantially the same as the central elastic elastic part fixing part 62 shown. The central region elastic expansion / contraction portion fixing portion 66 is configured by a plurality of linear fixing portions 66 a extending in the main body longitudinal direction X along the elastic member 15.

  The central region elastic expansion / contraction portion fixing portion 67 shown in FIG. 8B is substantially rectangular in a plan view, and the configuration shown in FIG. It is substantially the same as the central elastic elastic part fixing part 63 shown. The central elastic stretchable part fixing part 67 is configured by a plurality of dot-like fixing parts 67a.

  The central region elastic expansion / contraction portion fixing portion 68 shown in FIG. 8C and the central region elastic expansion / contraction portion fixing portion 69 shown in FIG. 8D are each configured by a plurality of dot-shaped fixing portions 68a or 69a. Except for this point, it is substantially the same as the central elastic stretchable part fixing part 65 shown in FIG. The center region elastic expansion / contraction portion fixing portions 68 and 69 each have a length L1 along the longitudinal direction of the main body that decreases from the outer edge portion 52sb toward the inner edge portion 52sa. Therefore, in both forms, the inner edge 52sa is more likely to stand on the skin side than the outer edge 52sb.

  8 (e) is configured by a plurality of dot-shaped fixing portions 70a, and includes a central elastic expansion / contraction portion fixing portion 69 shown in FIG. 8 (d). On the contrary, the length L1 along the longitudinal direction X of the main body is shortened from the inner edge 52sa toward the outer edge 52sb. Therefore, in this form, contrary to the form shown in FIG. 8D, the outer edge 52sb is more likely to stand on the skin side than the inner edge 52sa.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the above-described embodiment, the side edges 2 s and 2 s of the top sheet 2 are located inward in the main body width direction Y with respect to the side edges 4 s and 4 s of the absorber 4. , 4s, or may be located outward in the body width direction Y from the side edges 4s, 4s. Moreover, in the said embodiment, although the sanitary napkin was mentioned as one of the application examples of the absorbent article of this invention, For example, it can apply also to a disposable diaper, a panty liner (orimono sheet), an incontinence pad, etc.

1 Sanitary napkin (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 5 Leakproof wall 6 Side flap part 10 Absorbent body 15 Elastic member 51 Base wall part 51a Upper end part 51b of the base wall part 52 Lower end part 52 of the base wall part Elastic elastic part 52sa Elastic elastic part Inner edge 52sb outer edge 52A of the elastic elastic part inner elastic elastic part 52B outer elastic elastic part 53 end elastic elastic part fixing part 54, 61, 62, 63, 64, 65, 66, 67, 68, 69,70 Center region elastic expansion / contraction part fixing part 54a Skin contact surface 62a, 63a, 66a, 67a, 68a, 69a, 70a of central region elastic expansion / contraction part fixing part Elastic elastic part constituting the central region elastic expansion / contraction part fixing part Fixed part A with the absorptive main body A excretory part facing part B rear part X main body longitudinal direction Y main body width direction

Claims (3)

An absorbent article comprising a substantially vertically long absorbent main body comprising a liquid-retaining absorbent body and a pair of leak-proof walls disposed on both side portions along the longitudinal direction of the absorbent main body. ,
The leak-proof wall is connected to the skin contact surface side of the absorbent main body along the longitudinal direction of the main body and is connected to the upper end of the base wall so as to contact the wearer's skin when worn. It is configured to include a surface elastic elastic part that touches,
The elastic stretchable portion is fixed to the absorbent main body at the front end portion and the rear end portion in the longitudinal direction of the main body of the leak-proof wall, and an end elastic stretchable portion fixing portion is formed. Mid-range elastic expansion / contraction, which is sandwiched between the rear end portion, in the central region in the longitudinal direction of the leak-proof wall, wherein the elastic expansion / contraction portion is fixed to the absorbent main body, and standing of the base wall portion is inhibited. The fixed part is formed locally,
The central elastic stretchable portion fixing portion is formed at the central portion in the width direction of the elastic stretchable portion excluding both side edges along the longitudinal direction of the main body of the elastic stretchable portion. Absorbent article that is not fixed.   The central elastic stretchable portion fixing portion has a length along the longitudinal direction of the main body as it goes outward or inward in the width direction of the main body starting from a virtual straight line that bisects the elastic stretchable portion in the width direction of the main body in plan view. The absorbent article according to claim 1, wherein the length of the absorbent article is shortened.   The absorption according to claim 1 or 2, wherein the central region elastic expansion / contraction portion fixing portion is formed by a plurality of fixing portions formed in a dot shape in plan view and the elastic expansion / contraction portion with the absorbent main body. Sex goods.

Images