TWI826651B - absorbent articles - Google Patents

Abstract

Increase the protruding height of the three-dimensional hems to prevent leakage and reduce discomfort.

The present invention is located on both sides of the skin contact surface in the longitudinal direction, by The hem sheet 7 is provided with a plurality of elastic members 14 for loops at designated intervals in the width direction, forming hollow annular three-dimensional hems 10 protruding toward the wearer's skin side. The elastic member 14 for the ring part is composed of two side elastic stretchable members 15 respectively arranged on both sides of the ring part, and a plurality of intermediate elastic stretchable members 16 arranged between the two side elastic stretch members 15. The separation distance B between adjacent middle elastic stretchable members 16 is smaller than the separation distances A and C between the elastic stretchable members 15 on both sides and the adjacent middle elastic stretchable members 16 . The length D of the section where elasticity is imparted to the hem sheet 7 by the middle elastic stretchable member 16 is longer than the length E of the section where stretchability is imparted to the hem sheet 7 by the elastic stretchable members 15 on both sides.

Description

absorbent articles

The present invention mainly relates to absorbent articles such as sanitary napkins, panty liners, incontinence pads, and toiletries. Specifically, the present invention relates to a device that has hollows protruding toward the skin side on both sides of the long side of the skin contact surface. Absorbent article with circular three-dimensional hems.

Conventionally, the above-mentioned absorbent article has been known to consist of a liquid-impermeable back sheet such as a polyethylene sheet or a polyethylene sheet laminated with a nonwoven fabric and a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet. In between, there is an absorbent body made of cotton-like pulp, etc.

Especially for sanitary napkins for night use, there are many side leaks on the market to prevent body fluids such as menstrual blood from flowing in the width direction during wearing, and leaking from the side edges. , respectively forming three-dimensional folds protruding toward the skin side.

The aforementioned three-dimensional hems are formed by folding non-woven fabric into two or three folds, and joining the two ends of the absorbent article in the longitudinal direction to the side of the absorber, so that the front end is free in the middle part in the longitudinal direction. The end is a vertical wall-shaped three-dimensional hem that stands up towards the skin side. In addition, the following Patent Documents 1 and 2 disclose a three-dimensional hem, which is composed of a planar elastic stretch portion connected to the upper end of the base wall portion and in contact with the wearer's skin when worn, and forms a cross-sectional view. Stand up in a slightly T-shape.

And, in addition, it forms a hollow ring-shaped three-dimensional ring that protrudes toward the skin side. Hemming (for example, the following Patent Documents 3 and 4) is also widely known.

[Previous technical literature]

【Patent Document】

[Patent Document 1] Japanese Patent No. 3871563

[Patent Document 2] Japanese Patent No. 5395630

[Patent Document 3] Japanese Patent No. 5123583

[Patent Document 4] Japanese Patent No. 5119041

Although the above-mentioned two-fold or three-fold vertical wall-shaped three-dimensional hems or the three-dimensional hems with a slightly T-shaped cross-section disclosed in the above-mentioned Patent Documents 1 and 2 have the advantage of increasing the standing height toward the skin side, there are some problems. It is easy to fall in the width direction, and when installed in a collapsed state, body fluids may leak out or cause discomfort.

On the other hand, the annular three-dimensional hems described in the above-mentioned Patent Documents 3 and 4 are less likely to collapse in the width direction, but due to the insufficient protrusion height toward the skin side, the skin surface and the annular three-dimensional hems are not in contact with each other during installation. Gaps are easily created between the edges, and there is a risk of body fluids leaking through the gaps.

In view of this, the main subject of the present invention is to provide an absorbent article with hollow annular three-dimensional hems, which can increase the protruding height of the three-dimensional hems to prevent leakage and reduce discomfort.

In order to solve the above-mentioned problems, the first aspect of the present invention provides an absorbent article in which both sides of the longitudinal direction of the skin-contacting surface are spaced apart along the longitudinal direction and in the width direction. An absorbent article equipped with a plurality of elastic stretchable members, each of which forms a hollow annular three-dimensional hem protruding toward the wearer's skin side, and has the following characteristics:

The aforementioned elastic stretchable member is composed of elastic stretchable members on both sides respectively arranged on both sides of the ring part, and a plurality of intermediate elastic stretchable members arranged in the middle of the elastic stretchable members on both sides; and

The separation distance between the adjacent middle elastic stretchable members is smaller than the separation distance between the elastic stretchable members on both sides and the adjacent middle elastic stretchable member;

The length of the section where stretchability is imparted to the sheet member by the middle elastically stretchable member is longer than the length of the section where stretchability is imparted to the sheet member by the elastically stretchable members on both sides.

In the invention described in the above-mentioned item 1, in the absorbent article in which the hollow annular three-dimensional hems are formed, the elastically stretchable members arranged on the sheet members constituting the annular three-dimensional hems are formed by being respectively arranged on the annular three-dimensional hems. It is composed of two side elastic stretchable members on both sides of the part, and a plurality of intermediate elastic stretchable members arranged in the middle of the two side elastic stretch members. Furthermore, the separation distance between the adjacent middle elastic stretchable members is smaller than the separation distance between the elastic stretchable members on both sides and the middle elastic stretchable member adjacent thereto; and at the same time, the distance provided by the middle elastic stretchable member is The length of the stretchable section of the sheet member is longer than the length of the stretchable section imparted to the sheet member by the elastic stretchable members on both sides. Thereby, the aforementioned intermediate elastically stretchable member is arranged relatively closely along the middle portion of the ring portion and is arranged in a relatively long section in the longitudinal direction. Therefore, the annular three-dimensional fold is made by the elastic force of the intermediate elastically stretchable member. The upper end of the side becomes easier to lean towards the muscles The skin side is highly erected, and the upper end of the highly erected ring is in close contact with the skin surface, thereby preventing leakage. In addition, since the three-dimensional hems are made of hollow annular three-dimensional hems, the hems are not easy to collapse when worn, can maintain close contact with the skin, and can reduce discomfort when wearing.

The present invention according to the second aspect provides the absorbent article as described in the first aspect, wherein the annular three-dimensional folds on both sides are respectively provided with 4 to 6 elastic stretchable members.

In the invention described in the above-mentioned item 2, from the viewpoint of clearly exerting the effect of each elastic stretchable member, 4 to 6 elastic stretchable members are arranged on each annular three-dimensional hem. These elastic stretchable members can be tied to one on both sides of the ring as the two-side elastic stretchable members, and 2 to 4 elastic stretchable members are arranged in the middle as the middle elastic stretchable members; they can also be tied to the ring. Two pieces are arranged on each side as the elastic stretchable members on both sides, and two pieces are arranged in the middle as the middle elastic stretchable member.

The present invention according to claim 3 provides the absorbent article according to claim 1 or 2, wherein the elongation rate of the middle elastic stretchable member is greater than the elongation rate of the elastic stretchable members on both sides.

In the invention described in Item 3 above, since the upper end of the annular three-dimensional hem stands higher toward the skin side due to the elastic force of the intermediate elastic stretchable member, the elongation rate of the intermediate elastic stretchable member is set to The elongation rate is larger than that of the elastic stretchable parts on both sides.

The present invention of Item 4 provides the absorbent article according to any one of Items 1 to 3, wherein the front end of the interval in which the stretchability of the sheet member is imparted by the intermediate elastic stretchable member is located closer to The front end of the interval in which the elastic stretchable members on both sides impart elasticity to the sheet member is further forward; the rear end of the interval in which the elastic stretchable member on both sides imparts stretchability to the sheet member is located further forward than the interval through the elastic stretchable members on both sides. Giving the aforementioned sheet member extension The contraction range is from the rear end to the rear side.

In the invention described in claim 4 above, the sections in which the elastic stretchability of the sheet member is imparted by the middle elastic stretchable member are positioned further forward than the segments in which stretchability of the sheet member is imparted by the elastic stretchable members on both sides. And the back side extends, so that the annular three-dimensional hem can stand up higher toward the skin side due to the hanging effect of the sheet member caused by the aforementioned middle elastic stretchable member.

The present invention of claim 5 provides the absorbent article according to any one of claims 1 to 4, wherein the hollow interior of the annular three-dimensional hem is provided with a three-dimensional hem for holding up, and the three-dimensional hem for holding up is provided. The side has a fixed end on the base end side of the annular three-dimensional hem, and the front end forms a free end and stands up toward the wearer's skin side; the free end of the aforementioned three-dimensional hem for holding up is arranged with a free end along the length direction. The elastic member for the end is used to hold up the annular three-dimensional hem from the inside of the hollow by the free end of the three-dimensional hem for holding up.

In the invention described in Item 5 above, a supporting three-dimensional flange made of a vertical wall-shaped three-dimensional flange is provided inside the hollow of the annular three-dimensional flange, whereby the free end of the three-dimensional flange is held up. Lift the annular three-dimensional hem from the hollow interior. Thereby, the annular three-dimensional folding edge becomes easier to protrude toward the skin side, and the adhesion of the annular three-dimensional folding edge to the skin surface becomes better, thereby preventing the leakage of body fluids. In addition, since the elastic member for the free end arranged on the free end of the three-dimensional hem for holding up contacts the skin surface through the sheet member of the annular three-dimensional hem, the skin touch of the elastic member becomes soft and can be Reduce discomfort when wearing.

The present invention according to claim 6 provides the absorbent article according to claim 5, wherein the supporting three-dimensional hem is formed of a sheet member continuous from the base end of the annular three-dimensional hem.

In the invention described in claim 6 above, since the three-dimensional hem for holding up is formed by a sheet member continuous from the base end of the three-dimensional hem for holding up, the three-dimensional hem for holding up is easy to form and the ring-shaped three-dimensional hem is formed. The three-dimensional hem becomes easy to protrude toward the skin side.

The present invention according to Item 7 provides the absorbent article according to Item 5 or 6, wherein the annular three-dimensional hem and the three-dimensional support hem are formed by cutting the sheet member in the width direction of the absorbent article. In the front view, in a state of being folded into three by the first and second folded parts, it has a first sheet part and a second sheet part in order from the non-skin side of the wearer. and the third sheet part; the aforementioned first folded part extends from the widthwise outer side of the absorbent article to the widthwise inward side and is reflected toward the wearer's skin side at the widthwise inner side. Fold; the aforementioned second folded portion is continuous with the first folded portion and extends outward in the width direction and is folded toward the non-skin side of the wearer at the outer position in the width direction;

The aforementioned sheet material also has a first joining portion, a second joining portion and a third joining portion; the aforementioned first joining portion joins the entire length of the aforementioned first sheet portion in the longitudinal direction to the non-skin of the wearer. The member arranged on the side; the aforementioned second joint portion is a position close to the aforementioned second folded portion; the entire length of the aforementioned second sheet portion in the longitudinal direction is joined to the aforementioned first sheet portion; the aforementioned third joint portion , the two ends in the longitudinal direction of the aforementioned third sheet portion are respectively joined to the aforementioned second sheet portion;

And in the longitudinal section between the third joint portions provided at both ends in the longitudinal direction, at least the third sheet portion has the first joint portion and the second joint portion as base ends and forms a through-shaped The user's skin side protrudes from the hollow of the annular three-dimensional hem, and the second sheet portion, with the second joint portion as a base end, forms a skin side facing the wearer in the hollow interior of the annular three-dimensional hem. Stand it up and use three-dimensional folding to hold it up as mentioned above.

The invention described in the above-mentioned item 7 is directed to a method for forming the aforementioned annular three-dimensional fold. The folding and joining states of sheet materials with three-dimensional folding at the sides and supports are specified. Specifically, the aforementioned annular three-dimensional hem and the supporting three-dimensional hem are formed in the middle part in the longitudinal direction by folding the sheet member into three in a specified shape and providing joints at appropriate positions of each layer. .

The present invention according to claim 8 provides the absorbent article according to any one of claims 5 to 7, wherein the free end portion of the three-dimensional support hem is at least a length corresponding to the length of the wearer's crotch. In the side section, it is located at the part where the annular three-dimensional folding edge protrudes highest toward the wearer's skin side.

In the invention described in Item 8 above, the free end of the three-dimensional hem for supporting is located at least in the long side section corresponding to the lower part of the wearer's crotch, and the annular three-dimensional hem protrudes toward the skin side of the wearer. The highest part is obtained, so the annular three-dimensional hem can be easily protruded toward the skin side by the aforementioned three-dimensional hem for holding up.

As described in detail above, the present invention can increase the protruding height of the annular three-dimensional folding edge, thereby preventing leakage and reducing discomfort.

1: sanitary napkin for menstrual use

2: Liquid-impermeable back sheet

3: Liquid-permeable surface sheet

4:Absorbent body

5: Wrapping sheet

6: Middle and high section

7: Folding sheet

10: Ring-shaped three-dimensional hemming

11: Hold up and use three-dimensional folding

12: Free end

13: Elastic material for free end

14: Elastic material for ring part

15: Elastic stretchable parts on both sides

16: Middle elastic stretchable part

20: 1st reflex part

21: The second reflexed part

22: 1st Sheet Department

23: 2nd Sheet Department

24: 3rd Sheet Department

25: 1st joint part

26: 2nd joint part

27:3rd joint

28: 4th joint

[Fig. 1] is a partially broken and developed view of the sanitary napkin 1 of the present invention.

[Figure 2] is a view of the II-II line arrow in Figure 1.

[Figure 3] is a view of the III-III line arrow in Figure 1.

[Figure 4] is a folded sheet showing the middle part of the longitudinal direction of the elastically stretchable member in a stretched state. Enlarged cross-sectional view of the inner part in the width direction of 7.

[Fig. 5] is an enlarged cross-sectional view showing an inner portion in the width direction of the hemmed sheet 7 at both ends in the longitudinal direction.

[Fig. 6] is a plan view of the sanitary napkin 1 showing each joint part.

[Fig. 7] is a perspective view showing the joint portion of the widthwise inner portion of the hem sheet 7.

The embodiments of the present invention will be described in detail below with reference to the drawings.

[Basic structure of sanitary napkin 1]

The sanitary napkin 1 of the present invention, as shown in Figures 1 to 3, is provided with a liquid-impermeable back sheet 2, a liquid-permeable surface sheet 3, an absorbent body 4, and hem sheets 7, 7; as mentioned above The liquid-impermeable back sheet 2 is made of polyethylene sheet, etc.; the liquid-permeable surface sheet 3 can quickly penetrate menstrual blood or secretions (hereinafter also collectively referred to as "body fluids"); the aforementioned absorption The body 4 is made of cotton-like pulp or synthetic pulp inserted between the two sheets 2 and 3; the aforementioned folding sheets 7 and 7 are tied to both sides of the skin contact surface almost all along the long side. direction, and simultaneously form a pair of left and right three-dimensional folds BS, BS, and the three-dimensional folds BS, BS are based on the approximately side edges of the absorbent body 4 as the standing base ends, and at least include the corresponding parts of the through-holes. The area of the user's body fluid discharge part H protrudes toward the skin side within a designated section in the longitudinal direction of the sanitary napkin (in the section corresponding to the lower part of the wearer's thigh); and around the aforementioned absorbent body 4, at its front and rear end edges, The outer edges of the liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 are joined by an adhesive such as hot melt glue or a joining means such as heat sealing or ultrasonic sealing. The side edge portion, the liquid-impermeable back sheet 2 and the hem sheet 7 extending laterally than the absorber 4 are bonded by an adhesive such as hot melt glue, heat sealing, ultrasonic sealing, etc. A pair of left and right wing-shaped flaps W and W extending outward respectively are formed on the side of the absorber almost corresponding to the body fluid discharge portion H, and at the rear side ( A pair of left and right rear fins W _B and W _B extending outward respectively are formed on both sides of the rear portion (buttock side). In addition, in the illustrated example, the absorbent body 4 is surrounded by a wrapping sheet 5 made of crepe paper, non-woven fabric, etc. in order to maintain the shape of the absorbent body 4 and improve the diffusibility. However, this wrapping may not be required. Sheet 5. In addition, although not shown in the figure, a second layer made of a hydrophilic nonwoven fabric having almost the same shape as the liquid-permeable surface sheet 3 may be disposed adjacent to the non-skin side of the liquid-permeable surface sheet 3 . Sheet.

The structure of the aforementioned sanitary napkin 1 will be further described in detail below:

The liquid-impermeable back sheet 2 is a sheet having at least water-blocking properties such as polyethylene. However, from the viewpoint of preventing stuffiness, it is preferable to use a sheet having moisture permeability. This water-blocking and moisture-permeable sheet is preferably a microporous sheet made by melting and kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene and forming the sheet. , obtained by extending in one or two axis directions. One or more adhesive layers (not shown) are formed on the non-skin side (outside) of the liquid-impermeable back sheet 2 along the length of the sanitary napkin, so that the sanitary napkin 1 can be fixed on the body when it is worn on the body. Underpants. The liquid-impermeable back sheet 2 may also be a polyethylene laminated non-woven fabric in which a plastic film and a non-woven fabric are laminated.

Next, as the liquid-permeable surface sheet 3, porous or non-porous non-woven fabrics or porous plastic sheets are suitably used. In addition to olefin-based, polyester-based, polyamide-based synthetic fibers such as polyethylene or polypropylene, the material fibers that make up the nonwoven fabric can also be regenerated fibers such as rayon or cuprammonium, and natural fibers such as cotton. And nonwoven fabrics obtained by appropriate processing methods such as water needling, spun bonding, hot melt bonding, melt blowing, needle rolling, etc. can be used. Among these processing methods, the advantage of water needling is that Due to its softness and drape, the advantages of hot melt bonding are fluffy and high compression recovery. When the liquid-permeable surface sheet 3 has a plurality of perforations, body fluids are quickly absorbed and the dryness is excellent. The fibers of the nonwoven fabric can be either long fibers or short fibers, but since the texture of a towel is ideal, short fibers are preferably used. In addition, in order to facilitate the embossing process, it is preferable to use olefin fibers such as polyethylene or polypropylene with a low melting point. In addition, composite fibers such as core-sheath type fibers, in which fibers with a high melting point are used as the core and fibers with a low melting point are used as the sheath, or side-by-side fibers or divided fibers, can also be used appropriately.

The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 is made of, for example, cotton pulp and a water-absorbent polymer. The water-absorbent polymer is mixed into the pulp constituting the absorbent body as granular powder, for example. The aforementioned pulps include chemical pulps obtained from wood, cellulose fibers such as dissolving pulps, or artificial cellulose fibers such as rayon and acetate. Compared with broadleaf tree pulps, they are more functional and more cost-effective. , more suitable for using conifer pulp with longer fiber length. The basis weight of the absorbent body 4 is 300 to 750 g/m ² , and preferably 300 to 400 g/m ² .

In addition, synthetic fibers may be mixed with the absorbent body 4 . The aforementioned synthetic fibers include, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate or polybutylene terephthalate, polyamides such as nylon, and These copolymers may also be a mixture of these two types. In addition, composite fibers such as core-sheath type fibers, in which a fiber with a high melting point is used as a core and a fiber with a low melting point is used as a sheath, or a side-by-side type fiber, a split type fiber, etc. can also be used. In order to make the aforementioned synthetic fibers have affinity for body fluids, in the case of hydrophobic fibers, those that have been surface-treated with a hydrophilizing agent are preferably used.

The skin-contact surface side of the absorbent body 4 is ideally located in the central portion in the width direction and includes a region corresponding to the wearer's body fluid discharge portion H, and has an elongated and thickened portion in the longitudinal direction of the sanitary napkin that is thickened toward the skin. The middle and high part of the absorber 6. The aforementioned mid-high portion 6 is provided to cover the area approximately from the body fluid discharge portion H of the wearer to the starting position of the hip groove, and is provided in the long side area of the middle portion from the wing-shaped flap W to the rear flap W _B. between. The above-mentioned middle and high portion 6 may be formed by integrating fibers with the absorber 4, or may be formed by laminating fibers separately from each other. The thickness of the middle and high portion 6 is preferably 3 to 20 mm, and ideally 5 to 15 mm, since too thick an absorbent body 4 will increase its rigidity and reduce its adhesion to the body. In addition, when the absorbent body 4 is surrounded by the wrapping sheet 5, as shown in Fig. 2, the absorbent body 4 and the middle and high portion 6 can be integrally wrapped. Although not shown in the figure, the absorbent body 4 can also be wrapped. and the middle and high parts 6 are respectively surrounded by wrapping sheets and then laminated.

On the other hand, in the illustrated example, the width dimension of the liquid-permeable surface sheet 3 is slightly longer than the width dimension of the absorbent body 4, and is only limited to covering. The outer side of the absorber 4 is equipped with a hem sheet 7 that is different from the liquid-permeable surface sheet 3. Specifically, it is equipped with a hem sheet 7 to prevent menstrual blood or secretions from penetrating, or to enhance the skin. For the purpose of touch feeling, etc., the hem sheet 7 composed of non-woven material with appropriate water-repellent treatment or hydrophilic treatment is used.

Such hem sheet 7 can be made of natural fiber, synthetic fiber, regenerated fiber, etc. as a material and formed by an appropriate processing method. However, it is ideal to use a soft non-woven fabric with a low basis weight to make it breathable. It is better to eliminate the rough feeling and prevent stuffiness. In particular, it is ideal to have a nonwoven fabric that has a softness that feels good against the skin even when it comes into contact with the skin in a state where it is highly protruded to the skin side due to the contraction force of the elastic material. Specifically, it is ideal to use nonwoven fabrics with a basis weight of 13 to 23 g/m ² and made by the spunbond method. In order to reliably prevent the penetration of body fluids, it is suitable to use silicone-based, paraffin-based, or alkyl-coated nonwoven fabrics. Nonwoven fabrics treated with water repellent such as chromium chloride based water repellent.

As shown in FIGS. 2 and 3 , the hem sheet 7 is connected to the middle in the width direction by an adhesive agent such as hot melt glue from a designated inner position to the outer edge of the liquid-impermeable back sheet 2 . The outer part of the part has a designated wing portion formed at a designated position. This flap portion has a pair of left and right wing-shaped flaps W, W formed on both sides of the portion that almost corresponds to the body fluid discharge portion H, and a pair of wing-shaped flaps W, W are formed on both sides of the rear rear side (buttock side). Rear flaps _WB , _WB . The long side section including this wing-shaped panel W corresponds to the lower part of the wearer's crotch. The outer sides (liquid-impermeable back sheet 2 side) of these wing-shaped flaps W and W and the rear flaps W _B and W _B are respectively provided with adhesive layers (not shown). When wearing underwear, they are The aforementioned wing-shaped flaps W and W are folded toward the opposite side at the position of the folding line RL at the base end, and are wound and fixed to the crotch portion of the underwear, while the aforementioned rear flap _WB is fixed to the inner surface of the underwear.

〔Three-dimensional hemming〕

The aforementioned three-dimensional hemming BS is made by folding the inner part in the width direction of the aforementioned hemming sheet 7 almost into a double layer, and at the same time, the appropriate positions of both ends or the long side of the double-layer sheet are fixed inside. The elastic stretchable members 14, 14... of the plurality of loops are arranged along the longitudinal direction of the sanitary napkin 1 and at designated intervals in the width direction, and the double-layer sheet is folded appropriately, and the designated intervals are provided. The parts are joined by joints and include a hollow annular three-dimensional hem 10 formed to protrude toward the wearer's skin side. As shown in FIG. 3 , the widthwise inward side portions and front and rear end portions of the folded sheet 7 are attached to the absorber 4 side in a suitably folded state, so that at least the part corresponding to the wear including the body fluid discharge portion H is formed. As shown in Figure 2, a pair of left and right three-dimensional hems BS and BS protruding toward the skin side are formed in a designated section in the longitudinal direction of the sanitary napkin at the lower part of the user's thigh.

The aforementioned elastic members 14 for the ring are arranged on both sides of the ring respectively. It is composed of elastic stretchable members 15, 15, and a plurality of intermediate elastic stretchable members 16 arranged between the elastic stretchable members 15, 15 on both sides.

The aforementioned elastic stretchable members 15 on both sides are respectively arranged on both sides of the annular three-dimensional folding edge 10, and are located at a lower side (base end side) than the upper part of the annular portion that contacts the skin surface when worn. Both sides of the ring portion are expanded outward to maintain the ring-shaped cross section of the hollow portion. The elastic stretchable members 15 on both sides are arranged one at a predetermined interval in the width direction from the middle elastic stretchable member 16, or a plurality of elastic stretchable members 15 are arranged at a predetermined interval from each other in the width direction. In the illustrated example, the elastic stretchable members 15 on both sides are arranged one on each side of the ring portion.

On the other hand, the aforementioned intermediate elastic stretchable member 16 is arranged on the upper part of the ring part of the annular three-dimensional hem 10, and pulls the upper part of the ring part toward the skin side, so that the upper part of the ring part can be easily installed. Set for skin contact. A plurality of the intermediate elastically stretchable members 16 are arranged at predetermined intervals in the width direction.

Figure 4 shows a state in which the elastic stretchable member arranged on the three-dimensional hem BS is stretched, and the hem sheet 7 is folded and laminated on the surface sheet 3 side without shrinkage deformation caused by the shrinkage force of the elastic stretch member. Cross-sectional view. In this sanitary napkin 1, as shown in Figure 4, the separation distance B between the adjacent middle elastic stretchable members 16, 16 is longer than the separation distance B between the elastic stretchable members 15 on both sides and the adjacent middle elastic stretchable member 16. The separation distance A and C is small. That is, there are relationships of B<A and B<C. The aforementioned separation distance B is preferably 2 to 9 mm, and the aforementioned separation distances A and C are preferably 7 to 15 mm. As long as the aforementioned separation distances A and C respectively have dimensions within this range, they do not need to be the same size and can also be formed with different sizes.

In addition, as shown in FIG. 1 , the length D along the longitudinal direction of the sanitary napkin in the section where elasticity is imparted to the hem sheet 7 by the aforementioned middle elastic stretchable member 16 is longer than that by the aforementioned elastic stretch on both sides. The length E in the longitudinal direction of the sanitary napkin of the section where the stretchable member 15 imparts stretchability to the hem sheet 7 is long. The range in which the hem sheet 7 is stretchable by the elastically stretchable member refers to the longitudinal direction range of the sanitary napkin 1 in which the hemsheet 7 shrinks due to the shrinkage force of the elastically stretchable member in the natural state, and It refers to the range in which elasticity is lost except that the two ends of the elastic stretchable member are continuous and joined to the hem sheet 7, and/or the two ends of the elastic stretch member are not continuous and joined to the hem sheet 7. The elastic force of the elastically stretchable member does not act on the middle section of the sanitary napkin 1 in the longitudinal direction other than the range of the hem sheet 7 .

With such a structure, the aforementioned intermediate elastically stretchable members 16, 16 are arranged relatively closely and in a relatively long section at the upper end of the ring portion. Therefore, the elastic force of the intermediate elastically stretchable member 16 acts concentratedly on a relatively long area. At the same time, it acts on a long section in the longitudinal direction, so that the hem sheet 7 is lifted by the elastic force of the middle elastic stretchable member 16, making it easier to lift the upper end of the annular three-dimensional hem 10. It stands up highly toward the skin side, and the upper end of the highly raised piece adheres closely to the skin surface, thereby preventing leakage. In addition, since the three-dimensional hem BS has a hollow annular three-dimensional hem 10, the hem is not easy to collapse when installed, can maintain a state of close contact with the skin surface, and can reduce the discomfort during installation.

Ideally, the annular three-dimensional hems 10 on both sides are respectively equipped with 4 to 6 elastic members 14 for the ring (the total elastic stretchable members 15 on both sides and the elastic stretchable member 16 in the middle are provided on the ring) ). Thereby, the effect of each elastic stretchable member becomes clear, and the standing height of the annular three-dimensional hem 10 toward the skin side can be increased more reliably. The arrangement of these elastic stretchable members is arbitrary. One piece can be arranged on each side as the aforementioned elastic stretchable members 15 on both sides, and 2 to 4 pieces can be arranged in the middle as the aforementioned middle elastic stretchable member 16; it can also be arranged on both sides. Two pieces are arranged on each side as the aforementioned elastic stretchable members 15 on both sides, and two pieces are arranged in the middle as the aforementioned middle elastic members. Sexually stretchable member 16. When arranging two elastic stretchable members 15 on both sides, the ideal separation width is 2 to 9 mm. Furthermore, the aforementioned elastic stretchable members 15 on both sides do not need to be symmetrical in number, and may also be arranged in a different number. In the example shown in the figure, one elastic stretchable member 15 is arranged on each side as both sides, and two elastic stretchable members 16 are arranged in the middle. A total of four elastic stretchable members 14 for the ring are arranged... .

From the viewpoint of raising the upper end of the ring portion toward the skin, it is preferable that the elongation rate of the middle elastic stretchable member 16 is greater than the elongation rate of the both side elastic stretchable members 15 . Thereby, due to the contraction force of the intermediate elastically stretchable member 16, the upper end of the ring portion stands higher toward the skin side. The elongation rate of the middle elastic stretchable member 16 is ideally 150~200%; the elongation rate of the elastic stretchable members 15 on both sides is ideally 100~150%. The aforementioned elongation is the elongation when the natural length is 100%.

When the length of the section in which elasticity is imparted to the hem sheet 7 by the intermediate elastic stretchable member 16 is relatively long, as shown in FIG. The front end of the stretchable section is located further forward than the front end of the stretchable section of the hem sheet 7 provided by the elastic stretchable members 15 on both sides. The elastic stretchability of the hem sheet 7 is provided by the elastic stretchable member 16 in the middle. The rear end of the section is located further back than the rear end of the section where elasticity is imparted to the hem sheet 7 by the elastic stretchable members 15 on both sides. That is, the section where the elastic stretchability of the hem sheet 7 is provided by the middle elastic stretchable member 16 is positioned further forward and rearward than the section where stretchability of the hem sheet 7 is provided by the elastic stretchable members 15 on both sides. Extended existence. Thereby, the annular three-dimensional hem 10 can be raised higher toward the skin side due to the hanging effect of the hem sheet 7 caused by the middle elastic stretchable member 16 extending longly forward and backward from the upper end.

In addition, when the length of the section in which elasticity is imparted to the hem sheet 7 by the middle elastically stretchable member 16 is relatively long, as shown in FIG. The elasticity zone is extended by almost the same length on the front side and the back side respectively. Thereby, the hanging effect of the hem sheet 7 caused by the middle elastic stretchable member 16 is almost equal from the front to the back, and the standing height toward the skin side from the front side to the back side can be increased. On the other hand, in the case where the front side is to be raised higher and the standing height is gradually lowered toward the rear side, the extension amount of the interval in which the elasticity of the hem sheet 7 is imparted by the intermediate elastic stretchable member 16 can be set to The front side is enlarged and the rear side is reduced.

The structure of the aforementioned three-dimensional folding edge BS is further described in detail: the aforementioned three-dimensional folding edge BS is ideally composed of the above-mentioned annular three-dimensional folding edge 10 and the three-dimensional folding edge 11 for holding up; the aforementioned three-dimensional folding edge 11 for holding up is along the long side. The direction is arranged in the hollow interior of the annular three-dimensional hem 10. It has a fixed end on the base end side of the annular three-dimensional hem 10, and the front end forms a free end portion 12 that stands up toward the wearer's skin side. A free end elastic member 13 is arranged along the longitudinal direction of the free end of the three-dimensional lifting hem 11 . The annular three-dimensional hem 10 is held up from the hollow interior by the free end 12 of the three-dimensional hem 11 for holding up.

By the annular three-dimensional folding edge 10 being held up by the aforementioned three-dimensional folding edge 11, the annular three-dimensional folding edge 10 becomes more likely to protrude highly towards the skin side, and the annular three-dimensional folding edge 10 has good adhesion to the skin surface. It becomes better and can prevent the leakage of body fluids more reliably. In addition, since the free end elastic member 13 disposed on the free end 12 of the lifting three-dimensional hem 11 contacts the skin surface through the sheet member of the annular three-dimensional hem 10, the elastic member has a better skin feel. Becoming softer can reduce the discomfort when wearing it. In this way, the annular three-dimensional folding edge 10 is a structure that is not easy to collapse. In addition, the annular three-dimensional folding edge 10 is held up by the three-dimensional folding edge 11 toward the wearer's skin side and highly protrudes toward the skin side, so it can be maintained. The annular three-dimensional hem 10 adheres closely to the skin surface and can prevent Stop leakage of body fluids.

The annular three-dimensional hem 10, as shown in Figure 2, has a slightly side edge of the absorbent body 4 as a base end, and protrudes toward the wearer's skin side into a longitudinally elongated, slightly dome-shaped hollow ring in cross-section. status. The base end of the annular three-dimensional hem 10 is ideally joined to the absorber 4 side through two joints separated in the width direction. The ring portion protruding from the joint portion of the base end toward the skin side is fixed at appropriate positions at both ends or in the longitudinal direction as described above, and a plurality of ring portions are arranged in a stretched state using elastic members. In the illustrated example, there are four elastic members 14, 14... for the ring.

The aforementioned three-dimensional flange 11 for holding up, as shown in FIG. 4 , is disposed inside the hollow of the aforementioned annular three-dimensional flange 10 , and has a fixed end (joint portion) on the base end side of the aforementioned annular three-dimensional flange 10 and a front end. A vertical wall-shaped three-dimensional hem is formed at the free end 12 .

The fixed end of the lifting three-dimensional flange 11 can be arranged at any position as long as it is inside the hollow on the base end side of the annular three-dimensional flange 10 . That is, as shown in the figure, the annular three-dimensional hem 10 has two joint parts (the first joint part 25 and the second joint part 26 to be described later) separated in the width direction of the sanitary napkin 1 as the base end. In the form of a hollow annular shape, the fixed end may be provided at or near the joint part on the inside or outside in the width direction, or the fixed end part may be provided at the middle part of the joint part. From the viewpoint of simplifying manufacturing and making the rising direction of the lifting three-dimensional hem 11 face inward, it is ideal that the joint portion (second joint portion 26) on the outside in the width direction has a fixed end.

The free end 12 of the aforementioned lifting three-dimensional hem 11 contacts the inner surface of the annular three-dimensional hem 10 to assist the annular three-dimensional hem 10 to protrude toward the skin side from the inside. Although the cross-sectional shape of the three-dimensional folding edge 11 for holding up is formed in a substantially linear shape in the illustrated example, it may also be in a roughly "ㄑ" shape or a slightly "Z" shape, in which the middle portion is bent one or more times. shape formed. also, Although in the illustrated example, only the free end 12 of the lifting three-dimensional flange 11 is provided with the free end elastic member 13, one or more elastic members may be disposed between the free end and the base end.

Although the aforementioned three-dimensional folding edge 11 for holding up can also be formed by a sheet material different from the aforementioned annular three-dimensional folding edge 10, as shown in FIG. The base end portion is formed from a sheet material. By forming it from a sheet member that is continuous from the annular three-dimensional hem 10 , the lifting three-dimensional hem 11 can be easily installed in the hollow interior of the annular three-dimensional hem 10 .

The specific structure of the aforementioned annular three-dimensional folding edge 10 and the three-dimensional folding edge for holding up 11 is explained: the aforementioned annular three-dimensional folding edge 10 and the three-dimensional folding edge for holding up 11 are connected to the inner side portion of the folding sheet 7 in the width direction and are almost opposite to each other. A sheet with elastic members (the aforementioned elastic members 13 for free ends and the elastic members 14 for loops...) arranged at appropriate positions inside the double-layered sheet folded into two layers along the longitudinal direction of the sanitary napkin 1 As shown in FIGS. 4 and 5 , the sanitary napkin 1 is in a state of being folded into three by the first reflexed portion 20 and the second reflective portion 21 in a cross-sectional view in the width direction of the sanitary napkin 1 , a first sheet part 22, a second sheet part 23 and a third sheet part 24 are formed in order from the non-skin side of the wearer; the aforementioned first folded part 20 is formed from the sanitary napkin 1 The outer side in the width direction extends toward the inner side in the width direction and is folded toward the wearer's skin side at the inner side in the width direction; the aforementioned second folded portion 21 is a continuation of the first folded portion 20 It extends toward the outer side in the width direction and is folded toward the non-skin side of the wearer at the outer position in the width direction.

In addition, as shown in FIGS. 6 and 7 , a first joint part 25 , a second joint part 26 and a third joint part 27 are provided; the first joint part 25 is located slightly in the width direction of the first reflected part 20 The first sheet portion 22 is joined to the member disposed on the non-skin side of the wearer (liquid-permeable surface sheet 3) over the entire length of the longitudinal direction at a position where the outer side is further in; the second joint is The joining portion 26 joins the entire length of the second sheet portion 23 to the first sheet portion 22 in the longitudinal direction at a position close to the second folded portion 21; the third joining portion 27 joins the aforementioned third joining portion 27 to the first sheet portion 22. Both ends in the longitudinal direction of the third sheet portion 24 are respectively joined to the second sheet portion 23 . In addition, in this embodiment, a fourth joining portion 28 is provided, which joins both ends of the first sheet portion 22 in the longitudinal direction to the liquid-permeable parts at a position close to the first folded portion 20 . Sexual surface sheet 3. The boundary between the fourth joint portion 28 and the first joint portion 25 does not need to be clear, and they may be connected in the width direction. In this case, an extension line extending from the side edge of the first joint portion 25 to both ends in the longitudinal direction from the section where only the first joint portion 25 exists in the longitudinal middle portion can be used as a boundary to distinguish the first joint portion 25 from the first joint portion 25 . 4th joint part 28. In addition, FIG. 6(A) is a plan view showing the joint part (the first joint part 25 and the fourth joint part 28) of the first sheet part 22 and the liquid-permeable surface sheet 3, and FIG. 6(B) is A plan view showing the joint part (the aforementioned second joint part 26) of the second sheet part 23 and the first sheet part 22, and FIG. 6(C) shows the joint of the third sheet part 24 and the second sheet part 23. (the aforementioned third joint portion 27).

Furthermore, in the longitudinal section between the third joint portions 27 and 27 provided at both ends in the longitudinal direction, at least the third sheet portion 24 is formed by the first joint portion 25 and the second joint portion 26. The base end forms a hollow annular three-dimensional hem 10 that protrudes toward the wearer's skin side. At the same time, the second sheet portion 23 uses the second joint portion 26 as a base end and is located inside the hollow of the annular three-dimensional hem 10. A three-dimensional support hem 11 is formed that stands toward the wearer's skin side. That is, the annular three-dimensional hem 10 is formed into a hollow annular shape with the two first joint portions 25 and the second joint portion 26 separated in the width direction as base ends and protrudes toward the skin side, and the aforementioned lifting function The three-dimensional hem 11 rises toward the skin side with the second joint portion 26 at the base end of one side (the outer side in the width direction) constituting the annular three-dimensional hem 10 as a base end.

With the above structure, the annular three-dimensional hem 10 and the supporting three-dimensional hem 11 can be continuously formed with one hem sheet 7 . In addition, in the three-dimensional hem of this embodiment, the three-dimensional hem 11 for holding up is a second piece extending toward the inward side in the width direction with the second joint portion 26 provided on the outer side in the width direction as a base end. The material portion 23 is formed, so when the lifting three-dimensional folding edge 11 is raised toward the skin side, the free end portion 12 will face the width direction inward side, so for the movement from the width direction inward side to the width direction outer side, The annular three-dimensional hem 10 has a structure that is less likely to fall outward in the width direction due to pressure and the resistance of the three-dimensional hem 11 for lifting inside.

In the embodiment examples shown in FIG. 5, FIG. 6(C) and FIG. 7, the third joint part 27 joins the third sheet part 24 and the second sheet part 23 almost over the entire width, but as long as at least If it is provided at a position close to the first reflexed portion 20 that overlaps with the elastic member 13 for the free end, it does not need to be disposed on the second reflective portion 21 side.

The aforementioned third joint portion 27 is provided between the longitudinal end of the sanitary napkin 1 and the end of the interval where the elasticity of the hem sheet 7 is imparted by the aforementioned intermediate elastic stretchable member 16, and extends on both sides. It exists and is provided to the end of the interval in which elasticity is imparted to the hem sheet 7 by the elastically stretchable members 15 on both sides.

By providing the third joint portion 27, the annular three-dimensional hem 10 does not protrude toward the skin side, and the hem sheet 7 is laminated on the surface side of the surface sheet 3 in a folded state as shown in Fig. 5 However, as shown in FIG. 6(C) , the third joint portion 27 is ideally provided only at both ends of the sanitary napkin 1 in the longitudinal direction and not at the middle portion thereof.

In addition, the fourth joint portion 28 is provided at the end of the interval from the longitudinal end of the sanitary napkin 1 to the stretchability provided by the intermediate elastic stretchable member 16 to the hem sheet 7 .

In the natural state where the contraction force of the elastic members 13 and 14 acts, the free end 12 of the three-dimensional support hem 11, as shown in Figure 2, is ideally at least in the long side section corresponding to the wearer's thigh. , is located at the highest portion of the annular three-dimensional hem 10 protruding toward the wearer's skin side. Corresponding to the long side section of the lower part of the wearer's thigh, the sanitary napkin 1 is bent and deformed the most in the long side direction, and by the contraction force of the elastic member arranged along the long side direction, the three-dimensional hem BS faces the skin side The part that is pulled up the highest. Here, since the free end portion 12 of the aforementioned lifting three-dimensional flange 11 is disposed so as to be freely changeable in the hollow interior of the annular three-dimensional flange 10, in the hollow interior of the annular three-dimensional flange 10, It is easy to move to the part that protrudes highest toward the wearer's skin side, and is supported from the inside to assist the annular three-dimensional folding edge 10 by protruding toward the skin side with the supporting three-dimensional folding edge 11, so that the annular three-dimensional folding edge 10 is It protrudes more highly toward the skin side, thereby maintaining a state of close contact with the wearer's skin. This improves the effect of preventing leakage of body fluids.

From the viewpoint of further demonstrating such an effect, the elongation rate of the free end elastic member 13 disposed on the free end 12 of the lifting three-dimensional flange 11 may be set to be higher than that of the annular three-dimensional flange 10 . The elastic member 14 for the ring portion has a large elongation rate. Thereby, the effect of holding up the annular three-dimensional hem 10 by the three-dimensional hem 11 can be further improved, and the annular three-dimensional hem 10 can be made to protrude further toward the skin side. In addition, since the loop elastic member 14 arranged on the annular three-dimensional hem 10 is in direct contact with the skin surface, if the elongation rate is increased, the skin feel on the skin surface will be deteriorated and the wearing feeling will be reduced. However, it is arranged on the skin surface. Since the free end elastic member 13 for holding up the free end 12 of the three-dimensional hem 11 contacts the skin surface through the annular three-dimensional hem 10, the fit will not be significantly reduced even if the elongation is increased. . The elongation rate of the free end elastic member 13 is 1 to 3 times that of the ring elastic member 14, and preferably is 1.2 to 2 times.

1: sanitary napkin for menstrual use

2: Liquid-impermeable back sheet

3: Liquid-permeable surface sheet

4:Absorbent body

5: Wrapping sheet

6: Middle and high section

7: Folding sheet

10: Ring-shaped three-dimensional hemming

11: Hold up and use three-dimensional folding

12: Free end

13: Elastic material for free end

14: Elastic material for ring part

15: Elastic stretchable parts on both sides

16: Middle elastic stretchable part

BS: three-dimensional hemming

W: Wing-like flap

Claims (8)

An absorbent article in which a plurality of elastic stretchable members are arranged on both sides of the skin contacting surface in the longitudinal direction along the longitudinal direction and at designated intervals in the width direction. An absorbent article forming a hollow annular three-dimensional hem protruding toward the wearer's skin side, characterized in that the elastic stretchable member is composed of two side elastic stretchable members respectively arranged on both sides of the loop, and the elastic stretchable member is arranged on both sides of the loop. It is composed of a plurality of middle elastic stretchable members between the elastic stretchable members on both sides; and the separation distance between the adjacent middle elastic stretchable members is greater than the separation between the elastic stretchable members on both sides and the adjacent middle elastic stretchable member. The distance is small; the length of the section where the middle elastic stretchable member imparts stretchability to the sheet member is longer than the length of the section where the elastic stretchable members on both sides impart stretchability to the sheet member. For example, in the absorbent article described in Item 1 of the patent application, the annular three-dimensional hems on both sides are respectively equipped with 4 to 6 elastic stretchable members. In the absorbent article described in claim 1, the elongation rate of the middle elastically stretchable member is greater than the elongation rate of the elastically stretchable member on both sides. The absorbent article described in claim 1, wherein the front end of the interval in which the elastic stretchability is imparted to the sheet member by the middle elastic stretchable member is located farther than the stretchability imparted to the sheet member by the elastic stretchable members on both sides. The front end of the stretchable interval is further forward; the rear end of the interval where stretchability is imparted to the sheet member by the middle elastic stretchable member is located further than the rear end of the interval where stretchability is imparted to the sheet member by the elastic stretchable members on both sides. rear side. The absorbent article described in claim 1, wherein the hollow interior of the annular three-dimensional hem is provided with a three-dimensional hem for support, and the three-dimensional hem for support is located on the base end side of the annular three-dimensional hem. It has a fixed end, and the front end forms a free end that stands up toward the skin side of the wearer; the free end of the three-dimensional support hem is provided with an elastic member for the free end along the length direction. The free end of the folded edge, the aforementioned annular three-dimensional folded edge is lifted up from the inside of the hollow. In the absorbent article described in claim 5, the three-dimensional hem for holding up is formed of a sheet member continuous from the base end of the annular three-dimensional hem. For example, the absorbent article described in claim 5 or 6, wherein the annular three-dimensional hem and the three-dimensional hem for support are formed by using the above-mentioned sheet member in a cross-sectional view in the width direction of the absorbent article. In a state of being folded into three by the first reflexed part and the second reflective part, it has a first sheet part, a second sheet part and a third sheet in order from the non-skin side of the wearer. part; the aforementioned first folded portion extends from the widthwise outer side to the widthwise inward side of the absorbent article and is folded toward the wearer's skin side at the widthwise inner side; the aforementioned second folded portion The folded portion is continuous with the first folded portion and extends outward in the width direction and is folded toward the non-skin side of the wearer at a position on the outer side in the width direction; the aforementioned sheet member also has a first joint portion and a first joint portion. 2 joint parts and 3 joint parts; the first joint part is a member arranged to join the entire length of the first sheet part in the longitudinal direction to the non-skin side of the wearer; the second joint part, The entire length of the second sheet part in the longitudinal direction is joined to the first sheet part at a position close to the second folded part; the third joining part is the long side of the third sheet part. The two end portions in the direction are respectively joined to the aforementioned second sheet portion; And in the longitudinal section between the third joint portions provided at both ends in the longitudinal direction, at least the third sheet portion has the first joint portion and the second joint portion as base ends and forms a through-shaped The user's skin side protrudes from the hollow of the annular three-dimensional hem, and the second sheet portion, with the second joint portion as a base end, forms a skin side facing the wearer in the hollow interior of the annular three-dimensional hem. Stand it up and use three-dimensional folding to hold it up as mentioned above. The absorbent article described in claim 5 or 6, wherein the free end of the three-dimensional support hem is located on the annular three-dimensional hem at least in the long side section corresponding to the lower part of the wearer's crotch. The edge is the part that protrudes highest toward the wearer's skin side.

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