JP4963250B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins and disposable diapers.

  Conventionally, in an absorbent article provided with an absorbent layer and a leak-proof layer such as sanitary napkins and disposable diapers, a leak-proof wall is disposed along the longitudinal direction on each outer side in the width direction of the absorbent layer. Are known. The purpose of the leak-proof wall is to deform the absorbent article into a preferable three-dimensional shape that fits the wearer, to improve the adhesion of the wearer to the skin, and to reliably prevent liquid leakage.

As an absorbent article having such a leak-proof wall, the present applicant has first made a base wall portion standing upright from the outer side in the width direction of the absorbent layer, and a wearer's continuous connection with the upper end portion of the base wall portion. The absorbent article which has the leak-proof wall provided with the skin contact part which contact | abuts to skin in planar shape was proposed (refer patent document 1). According to the absorbent article described in Patent Document 1, since the skin contact portion contacts the wearer's skin in a planar shape, the fit with the skin is improved, and the effect of preventing liquid leakage is increased. However, the demand for absorbent articles is increasing, and there is a demand for a product that is more excellent in fit and prevention of liquid leakage.
On the other hand, in order to improve the standing property of the base wall part in the leak-proof wall, a folding guide part is provided at the center part in the height direction of the base wall part, and an elastic member is arranged on the folding guide part (see Patent Document 2) In addition, there is known one in which an elastic member is disposed in the vicinity of the folded portion in the leak-proof wall having the folded portion (see Patent Document 3).

JP 2002-656 A JP 2001-145667 A JP 2001-95844 A

However, depending on the absorbent articles described in Patent Documents 2 and 3, the elastic member in the vicinity of the folded portion is affected differently from the base wall portion and the skin contact portion during use, so the shape of the skin contact portion is different. It becomes difficult to stabilize.
Therefore, an object of the present invention is to provide an absorbent article having a leak-proof wall composed of a base wall portion and a skin contact portion, which can stably hold the shape of the skin contact portion, and has excellent fit to the skin when worn. An object of the present invention is to provide an absorbent article excellent in the effect of preventing liquid leakage.

The present invention is an absorbent article comprising an absorbent layer and a leak-proof layer, and a leak-proof wall provided in the longitudinal direction on each outer side in the width direction of the absorbent layer. A base wall portion erected from the outer side in the width direction of the layer, and a skin contact portion provided continuously at the upper end portion of the base wall portion in the longitudinal direction of the upper end portion, and the base wall portion A base wall elastic member is disposed in the vicinity of the upper end in the longitudinal direction of the leak-proof wall, and the base wall is provided between the upper end and the base wall elastic member. The above object is achieved by providing an absorbent article in which a large number of wrinkles are formed.

  According to the absorbent article of the present invention, since a large number of wrinkles are formed in the vicinity of the upper end portion of the base wall portion, the shape of the skin contact portion can be stably maintained, and excellent fit to the skin when worn Excellent liquid leakage prevention effect.

Hereinafter, the absorbent article of this invention is demonstrated, referring drawings based on the sanitary napkin which is one preferable embodiment.
The sanitary napkin 1 of this embodiment is provided with the absorption layer 11 and the leak-proof layer 12 as shown in FIGS. 1-4, and the leak-proof wall over the longitudinal direction in the width direction outer side of this absorption layer 11, respectively. 5 and 5 are provided.

The absorbent layer 11 of the sanitary napkin 1 of the present embodiment is mainly composed of a liquid-permeable surface sheet 2 and a liquid-retaining absorbent 4 as shown in FIG. The leak-proof layer 12 is composed mainly of a liquid-impermeable or liquid-impermeable back sheet 3.
As shown in FIG. 3A, the absorber 4 has a two-layer structure including an upper layer absorber 41 and a lower layer absorber 42. The upper layer absorber 41 is shorter in length and narrower than the lower layer absorber 42. Further, the upper layer absorbent body 41 is not joined to the lower layer absorbent body 42, and is located at the center portion in the longitudinal direction of the lower layer absorbent body 42 and at the center portion in the width direction. Therefore, the upper layer absorber 41 forms a so-called middle-high region.

As shown in FIG. 3A, the top sheet 2 covers the entire upper surface of the absorbent body 4, and further extends in the width direction from both side edges of the absorbent body 4 to the non-skin contact surface side of the absorbent body 4. It is caught in. As shown in FIGS. 2 and 3A, the back sheet 3 covers the lower surface of the absorbent body 4, and further extends outward in the width direction from both side edges of the absorbent body 4. Side flaps 13 are formed. As shown in FIG. 2, the back sheet 3 further extends outward in the width direction at the excretory part facing part A to form a pair of wings 12, 12. The wing 12 is bent at the time of wearing, and is fixed to the outer surface of underwear such as shorts via an adhesive or the like.
Further, the top sheet 2 and the back sheet 3 respectively extend in the longitudinal direction from the front and rear ends of the absorber 4 and are joined to each other at the extended portions to form end seal portions 14 and 14.

  In the present embodiment, as shown in FIG. 4, the leak-proof wall 5 includes a base wall portion 51 erected from the outer side in the width direction of the absorption layer 11, and an upper end portion 54 of the base wall portion 51. 54 and a skin contact portion 52 provided continuously along the longitudinal direction. Near the upper end 54 of the base wall 51, a base wall elastic member 91 is disposed along the longitudinal direction of the leak-proof wall 5, and the base wall 51 is shown in FIG. In addition, a large number of flanges 8 are formed between the upper end portion 54 and the base wall elastic member 91.

  The leak-proof wall 5 will be further described. As shown in FIGS. 1 and 2, the leak-proof wall 5 is arranged over the entire length of the sanitary napkin 1 in the longitudinal direction. As shown in FIG. 3A, the leak-proof wall 5 is configured mainly with a leak-proof wall forming sheet 53. The leakage preventing wall forming sheet 53 is a sheet having a constant width in the longitudinal direction, and is folded back so as to have a shape in which the skin contact portion 52 is continuously provided on the base wall portion 51 and the upper end portion 54 thereof. Yes. Therefore, the leak-proof wall 5 formed by folding the leak-proof wall forming sheet 53 has a two-layer structure in the base wall portion 51 and the skin contact portion 52 as shown in FIG. The lower end part 55 of the base wall part 51 is wound around the non-skin contact surface side of the absorber 4 as shown to Fig.3 (a). And the lower end part 55 wound by the non-skin contact surface side of the absorber 4 is the non-skin contact surface side of the surface sheet 2 wound by the non-skin contact surface side of the absorber 4, and the back surface sheet 3 Is fixed by a known joining means such as an adhesive.

  The base wall elastic member 91 is arranged in an extended state between the two layers of the leak-proof wall forming sheets 53 and 53 in the vicinity of the upper end portion 54 of the base wall 51, by a known means such as an adhesive. The two-layer leakage prevention wall forming sheets 53 and 53 are joined. The two layers of leak-proof wall forming sheets 53 and 53 joined to the base wall elastic member 91 are contracted by the contracting force of the base wall elastic member 91, and as shown in FIG. A large number of ridges 8 are formed between the upper end portion 54 and the base wall elastic member 91. It is preferable that the base wall elastic member 91 is disposed at least in the excretory part facing part A and further extends to the front part B and / or the rear part C side.

As shown in FIG. 5, the multiple ridges 8 are formed by extending two layers of leak-proof wall-forming sheets 53, 53 projecting outward in the width direction and inward in the width direction of the sanitary napkin 1. That is, each flange 8 is formed to extend in the height direction of the base wall portion 51. From the viewpoint of stably holding the surface shape of the skin contact portion 52 as a flat surface, each of the ridges 8 is preferably formed with a small size. Specifically, the distance L2 between the adjacent ridges 8 is preferably 1 to 7 mm, and more preferably 1 to 5 mm. The space | interval L3 of the width direction in each ridge 8 becomes like this. Preferably it is 1-6 mm, More preferably, it is 2-4 mm.
The interval L2 between the ridges 8 is the width of the skin contact portion 52 (the free end along the longitudinal direction of the outer skin contact portion 52B from the free end along the longitudinal direction of the inner skin contact portion 52A). The length is preferably 5 to 30%, more preferably 10 to 20%.

The distance L1 between the upper end portion 54 and the base wall elastic member 91 in the base wall 51 is preferably 1 to 10 mm, more preferably from the viewpoint of forming a large number of ridges 8 by reducing the interval L2 between adjacent ridges 8. Is 1-5 mm. If the distance L1 between the upper end portion 54 and the base wall elastic member 91 exceeds 10 mm, the distance between the base wall elastic member 91 and the absorbent layer 11 becomes short, and it becomes difficult to form small wrinkles. There is a possibility that the surface shape of the skin contact portion 52 cannot be stably maintained.
The size of each of the large number of ridges 8 may not be the same, and the ridges 8 are preferably formed continuously over the entire area of the excretory part facing part A.

As shown in FIG. 3A, the skin contact portion 52 includes an inner skin contact portion 52A that protrudes inward in the width direction of the sanitary napkin 1 from the upper end portion 54 of the base wall portion 51, and a base wall portion. 51, an outer skin contact portion 52B projecting outward in the width direction of the sanitary napkin 1 from the upper end portion 51 of the sanitary napkin 1 so as to contact the wearer's skin in a planar manner at least in the excretion portion facing portion A. It has become.
A plurality of skin contact portion elastic members 92 are disposed in each of the inner skin contact portion 52A and the outer skin contact portion 52B along the longitudinal direction of the leak-proof wall 5. Hereinafter, the skin contact portion elastic member 92 disposed on the inner skin contact portion 52A is the inner elastic member 92A, and the skin contact portion elastic member 92 disposed on the outer skin contact portion 52B is the outer elastic member. It is called 92B. A plurality of inner elastic members 92A and outer elastic members 92B are arranged at intervals in the width direction (only one is shown in FIG. 4).

The inner elastic member 92A and the outer elastic member 92B are stretched between the two layers of leak-proof wall forming sheets 53 and 53 constituting the inner skin contact portion 52A and the outer skin contact portion 52B, respectively. It is arranged and joined to the two layers of the leak-proof wall forming sheets 53 and 53 by a known means such as an adhesive.
By disposing the inner elastic member 92A and the outer elastic member 92B on the inner skin contact portion 52A and the outer skin contact portion 52B, the skin contact portion 52 is given elastic elasticity, and the expansion / contraction region P is provided. Is formed. The stretchable region P refers to a region in which stretchability is substantially expressed, and even in a region where the skin contact portion elastic member 92 is present, for example, heat seal or the like is applied to increase the rigidity. It does not include a region where stretchability has substantially disappeared.

It is preferable that the skin contact portion elastic member 92 is disposed at least on the excretion portion facing portion A and further extends to the front portion B and / or the rear portion C side.
The number of inner elastic members 92A is preferably 1 to 5, more preferably 1 to 3, and the number of outer elastic members 92B is preferably 1 to 5, and more preferably 1 to 3. is there.

  In the present embodiment, as shown in FIG. 3A, both the inner skin contact portion 52A and the outer skin contact portion 52B project substantially horizontally. That is, the inner skin contact portion 52A and the outer skin contact portion 52B are integrally formed in a planar shape, and the skin contact portion 52 and the base wall portion 51 are shown in FIG. A T-shape is formed in a cross-sectional view in the width direction of the leak-proof wall 5 as shown (width direction of the sanitary napkin 1).

In the present embodiment, the protruding widths of the inner skin contact portion 52A and the outer skin contact portion 52B are different. The ratio of the overhang width of the inner skin contact portion 52A to the overhang width of the outer skin contact portion 52B (the former: the latter) is preferably 1: 5 to 5: 1. It is more preferably 1: 1 to 1: 4 from the viewpoint of preventing the area of the liquid absorption surface from being reduced due to the inward extension of the sanitary napkin 1 and widening the liquid absorption surface in the width direction.
The length from the free end along the longitudinal direction of the inner skin contact portion 52A to the free end along the longitudinal direction of the outer skin contact portion 52B, that is, the width of the skin contact portion 52 is fit. 10-50 mm is preferable from the point which makes a property and a leak-proof wall hard to get dirty.

As shown in FIG. 2, in the front part B, the skin contact part 52 is joined to the skin contact surface side of the top sheet 2 or the back sheet 3 by the front end seal part 14. Moreover, the inner side is joined to the skin contact surface side of the top sheet 2 or the back sheet 3 by the front leakage barrier seal 15.
Similarly, in the rear part C, the skin contact part 52 is joined to the skin contact surface side of the top sheet 2 or the back sheet 3 by the rear end seal part 14 in the rear part C. The inner side is joined to the skin contact surface side of the top sheet 2 or the back sheet 3 by the rear leakage barrier seal 15.

  The leak-proof wall 5 stands up in the excretory part facing part A and a part of the rear part C by the contraction force by the expansion / contraction region P (skin contact part elastic member 92). On the other hand, the leakage prevention wall 5 has at least the inner side in the width direction of the skin contact portion 52 (inner skin contact portion 52A) in the front part B and the remaining part of the rear part C. By being joined to the top sheet 2 or the back sheet 3 by the leak-proof wall seal portion 15, the standing is inhibited and does not stand. Therefore, as the skin contact portion 52 contracts, the sanitary napkin 1 is curved in a concave shape as shown in FIG.

In the rear part C, as shown in FIG. 3C, in the base wall part 51, a part of the leakage prevention wall forming sheet 53 is folded in a mountain fold so as to extend inward in the width direction. Thus, the multilayer portion 58 is formed. In the multi-layered portion 58, the opposed surface folded is joined by the opposed surface joining portion 57 to maintain the folded form.
From the viewpoint of satisfactorily raising the base wall portion 51 of the leak-proof wall 5, the facing surface bonding portion 57 is preferably provided at a position on the outer side in the width direction on the facing surface where the multilayer portion 58 is folded. . By providing the multilayer portion 58 on the leak-proof wall 5, the distance in the thickness direction from the upper end portion 54 of the base wall portion 51 to the back sheet 3 in the rear portion C is shorter than the thickness direction distance in the excretory portion facing portion A. It has become.
Further, since the multilayer portion 58 is not formed including the base wall portion elastic member 91 and the base wall portion elastic member 91 is not fixed by the multilayer portion 58, the skin contact portion also in the rear portion C. The planar shape of 52 is more stable. This planar shape stabilization effect can be achieved by the presence of at least one elastic member between the multilayer portion 58 and the upper end portion 54 of the base wall portion 51.

  The multilayer portion 58 is formed over a predetermined length in the longitudinal direction of the base wall portion 51. The length of the multilayer portion 58 is preferably 15 to 45%, more preferably 20 to 30%, of the entire length of the portion where the leak-proof wall 5 stands.

As the leak-proof wall forming sheet 53 constituting the leak-proof wall 5, a material conventionally used as a material constituting the leak-proof wall in an absorbent article such as a sanitary napkin can be used without particular limitation. Particularly preferably, a water-repellent sheet such as a hydrophobic nonwoven fabric is used.
The base wall elastic member 91 and the skin contact elastic member 92 in the leak-proof wall 5 are not limited to thread-like elastic members as long as they have elasticity, and may be belt-like.
Further, in the present embodiment, the base wall part 51 and the skin contact part 52 are integrally formed in the leak-proof wall 5, but the base wall part 51 and the skin contact part 52 are manufactured separately. They can also be formed by joining them.

In the sanitary napkin 1 of the present embodiment, a substantially U-shaped front groove 6 convex toward the front side is provided on the skin contact surface side of the front portion B as shown in FIGS. ing. On the skin contact surface side in the excretory part facing part A, a pair of central grooves 71 and 71 are provided in the width direction extending along the longitudinal direction. A substantially U-shaped first rear groove 72 convex toward the rear side is provided on the skin contact surface side in the rear portion C.
The pair of rear end portions of the front groove 6 and the front end portions of the pair of central grooves 71, 71 are respectively connected, and the pair of front end portions of the pair of central grooves 71, 71 and the first rear groove 72 are connected to each other. Are connected to each other to form a closed circumferential groove Q.

  As shown in FIG. 3B, the entire circumferential groove Q (the front groove 6, the central groove 71, the first rear groove 72) is integrally consolidated with the top sheet 2 and the lower layer absorbent body 42 of the absorbent body 4. Has been formed. The entire circumferential groove Q has a shape obtained by enlarging the outer shape of the upper-layer absorber 41 once. Therefore, the upper layer absorbent body 41 is surrounded by the entire circumferential groove Q in a plan view, and is enclosed in a closed space composed of the top sheet 2 and the lower layer absorbent body 42.

  A substantially U-shaped second rear groove 73 convex on the rear side is provided outside the first rear groove 72. The pair of front end portions of the second rear groove 73 is connected to the vicinity of the pair of front end portions of the first rear groove 72. The second rear groove 73 is formed by integrally compacting the topsheet 2 and the lower layer absorbent body 42 on the rear portion C side.

As the top sheet 2, the back sheet 3 and the absorbent body 4 in the sanitary napkin of the present embodiment, various materials conventionally used in absorbent articles such as sanitary napkins can be used without particular limitation.
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. As the back sheet 3, for example, a liquid-impermeable or water-repellent sheet such as a thermoplastic resin film (PE film or the like) or a laminate of the film and a nonwoven fabric can be used, and has water vapor permeability. Can also be used.
As the absorbent body 4, various materials conventionally used as absorbent bodies in absorbent articles such as sanitary napkins can be used without particular limitation, for example, a pile layer obtained by depositing pulp fibers, What consists of a nonwoven fabric which uses a pulp fiber as a raw material can be used. The absorber 4 may contain an absorbent polymer.

According to the sanitary napkin 1 of the present embodiment having the above-described configuration, since many ridges 8 are formed in the vicinity of the upper end portion 54 of the base wall portion 51, the surface shape of the skin contact portion 52 is stabilized. It can be held in a comfortable manner, has excellent fit to the wearer's skin, and has excellent liquid leakage prevention effect.
Further, the skin contact portion 52 includes an inner skin contact portion 52A and an outer skin contact portion 52B, and the inner elastic member 92A and the outer elastic member 92B are disposed on both skin contact portions 52A and 52B. Therefore, the skin contact part 52 has elasticity, and the fit property with respect to a wearer's skin further improves.
Furthermore, since the cross section in the width direction of the leak-proof wall 5 is formed in a T shape, the skin contact portion 52 is likely to contact the wearer's skin in a planar shape.

The absorbent article of the present invention is not limited to the above embodiments, and can be variously modified without departing from the spirit of the present invention.
When the leak-proof wall 5 having a T-shaped cross section is employed, the overhang widths of the inner skin contact portion 52A and the outer skin contact portion 52B may be the same, and the outer skin contact portion 52B is inward. The overhang width may be larger than the skin contact portion 52A.

  The inner skin contact portion 52A and the outer skin contact portion 52B do not have to protrude horizontally from the upper end portion 54. For example, the skin contact is caused by the respective tips protruding obliquely upward. The portion 52 and the base wall portion 51 may form a Y shape in a cross-sectional view of the leak-proof wall 5 in the width direction, and any of the inner skin contact portion 52A and the outer skin contact portion 52B Only one of them may be inclined obliquely upward.

  The leak-proof wall 5 having the planar skin contact portion 52 may have a form in which the inner skin contact portion 52A is not provided and only the outer skin contact portion 52B is provided. There may be a form in which only the inner skin contact part 52A is provided without the contact part 52B. However, from the viewpoint of stabilizing the surface shape of the skin contact part 52, these two forms (inward or outward) In the case where the skin contact portion is provided (extended) on only one of them, the protruding portion (from the upper end portion 54) from the base wall portion 51 in a direction different from the extending direction of the skin contact portion 52. It is preferable that the skin contact portion 52 protrudes inward or outward of the napkin 1 from the upper end portion 54 of the base wall portion 51, and the base wall portion 51 It is more preferable that the protruding portion extends near the upper end portion 54.

  The multilayer portion 58 of the leak-proof wall 5 may be formed by folding a part of the leak-proof wall-forming sheet 53 into a mountain fold so as to extend outward in the width direction. Other forms described in Japanese Patent No. 245306 can also be taken. The number of folds of the multilayer portion 58, the width of the multilayer portion 58, the position of the opposing surface bonding portion 57 on the opposing surface where the multilayer portion 58 is folded, and the like can be appropriately set.

In the absorber 4, the upper layer absorber 41 and the lower layer absorber 42 may be integrated by an adhesive or embossing means, or may be a flat shape having no medium-high structure.
Each structure mentioned above can be combined suitably.
The present invention can be applied to pants-type disposable diapers, incontinence pads, panty liners, etc., in addition to sanitary napkins and unfolded disposable diapers.

FIG. 1: is the perspective view which looked at the schematic form in a natural state from the back part side about the sanitary napkin as 1st Embodiment of the absorbent article of this invention. FIG. 2 is a plan view showing a state in which the sanitary napkin of the first embodiment is stretched. 3A is a schematic view of the XX cross section shown in FIG. 2, FIG. 3B is a partially enlarged view of FIG. 3A, and FIG. 3C is YY shown in FIG. It is a schematic diagram of a cross section. FIG. 4 is a perspective view of a cross section taken along line XX shown in FIG. FIG. 5 is a cross-sectional view taken along the line ZZ shown in FIG. 3A, and is a horizontal cross-sectional view between the upper end portion of the base wall portion and the base wall portion elastic member.

Explanation of symbols

1 Sanitary napkin (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 41 Upper layer absorber 42 Lower layer absorber 5 Leak preventive wall 51 Base wall part 52 Skin contact part 8 ridge 91 Base wall part elastic member 92 Skin contact part elastic member 11 Absorbing layer 12 Prevention Leakage layer A Excretion part opposite part B Front part C Back part

Claims (4)

A sanitary napkin comprising an absorbent layer and a leak-proof layer, and having a leak-proof wall provided in the longitudinal direction on each outer side in the width direction of the absorbent layer,
The leak-proof wall is provided on a wearer's skin, which is continuously provided in a longitudinal direction of the upper end portion on a base wall portion standing up from the outer side in the width direction of the absorbent layer, and an upper end portion of the base wall portion. It has a skin contact part that contacts the surface ,
In the vicinity of the upper end of the base wall, a base wall elastic member is disposed in the longitudinal direction of the leak-proof wall, and the base wall elastic member is a two-layer sheet for forming a leak-proof wall. It is arranged in an extended state between
Between the upper portion and the base wall portion elastic member definitive to the base wall portion, by the leakage preventing walls forming sheet of two-layer contracted by the contraction force of the base wall portion elastic member, the base wall portion Many ridges extending in the height direction are formed ,
The wrinkle is formed by the two layers of the leak-proof wall forming sheet projecting outward in the width direction and inward in the width direction of the absorbent layer, and continuously over the entire region of the excretory part facing part. Formed,
A sanitary napkin in which an interval between adjacent ridges is 1 to 7 mm, and an interval in the width direction of each ridge is 1 to 6 mm . The skin contact portion includes an inner skin contact portion projecting inward in the width direction of the absorbent article from the upper end portion, and an outer skin projecting outward in the width direction of the absorbent article from the upper end portion. 2. A skin contact portion elastic member is provided on each of the inner skin contact portion and the outer skin contact portion along the longitudinal direction of the leak-proof wall. The sanitary napkin as described. The inner skin contact portion and the outer skin contact portion are integrally formed in a planar shape, and the skin contact portion and the base wall portion form a T shape. The sanitary napkin according to claim 2. The sanitary napkin according to any one of claims 1 to 3, wherein a distance between the upper end portion and the base wall elastic member in the base wall is 1 to 10 mm.

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