JP6257558B2 - Absorbent articles - Google Patents

Description

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

As an absorbent article, for example, as a sanitary napkin that absorbs excreted fluid such as menstrual blood, a liquid-permeable top sheet located on the wearer's skin side and a liquid-impermeable side located on the clothes side It is common to provide the backsheet which has these, and the absorber provided between these top sheets and backsheets.
Since the top sheet of an absorbent article is a part which touches a user's skin, it is a big condition that it is flexible and the touch is good.
Therefore, in recent years, a top sheet provided with a plurality of rows of protrusions and grooves provided in a space between adjacent protrusions on the surface in contact with the skin is often used. Such a top sheet tends to feel the flexibility of the top sheet because the relatively soft convex part comes into contact with the skin and the convex part easily fits the skin surface.

  On the other hand, in the absorbent article, for example, as shown in Patent Document 1, the top sheet of the absorbent article is to add some effect to improve the feeling of use to the wearer, such as a refreshing feeling when worn. In some cases, for example, a medicine such as menthol is applied. When menthol is applied to the top sheet, it volatilizes at the time of wearing and gives a refreshing feeling to the wearer. Therefore, there is an advantage that unpleasant feeling such as stuffiness is hardly obtained and the feeling of use is excellent.

JP2015-12918A

  However, an absorbent article with a drug applied to the top sheet may cause irritation when directly touching the wearer's skin, depending on the type of drug, which may reduce the feeling of use. There are also many. For example, if the skin of the wearer directly touches the menthol-coated topsheet, the volatile drug such as menthol is too irritating and painful to the wearer. In some cases, it may cause a rash, resulting in a significant loss of usability.

  The technical problem of the present invention is that even when a volatile drug is applied to the top sheet, the wearer is less likely to be stimulated by directly touching the drug and impairs the feeling of use. It is providing the absorbent article which can be suppressed.

In order to solve the above problems, the absorbent article of the present invention is as follows.
(1) A top sheet having a length direction, a width direction, and a thickness direction, having liquid permeability, a back sheet having liquid impermeability, and disposed between the top sheet and the back sheet. The top sheet has a first surface located on the side opposite to the absorber, and a second surface on the absorber side, and the length direction A plurality of protrusions extending toward the first surface and extending in the width direction, and extending between the protrusions and extending in the length direction. A plurality of groove portions that are recessed toward the direction of the second surface, and the groove portions are in the direction of the absorber more than the position on the first surface side at the top of the convex portion. A first recess having a first bottom located in the first recess and discontinuous in the length direction in the first recess A plurality of second recesses formed in a recess shape opening in the first bottom portion, and the second recess portion extends from the first bottom portion toward the absorber. A second bottom portion having the highest fiber density in the top sheet provided to close the end portion on the absorber side of the peripheral wall portion, and the second recess portion includes the second recess portion. A volatile chemical | medical agent is apply | coated to the said 2nd surface of a bottom part, and the said 2nd bottom part is joined to the said absorber, The absorbent article.

(2) The absorbent article according to (1), wherein the peripheral wall portion includes a hole portion that penetrates the peripheral wall portion from the first surface to the second surface.
Thereby, even if the medicine is volatilized, a part of the volatilized medicine can be moved from the hole portion of the peripheral wall portion toward the second surface. The amount of volatilized chemicals that move toward the skin can be reduced, and the irritation to the skin can be reduced.

(3) The height from the surface on the top sheet side of the absorber to the first surface of the top portion of the convex portion is larger than the size in the width direction of the groove portion, (1) or ( The absorbent article as described in 2).
Thereby, when the convex part of the top sheet falls in the width direction, the second part of the second concave part to which the medicine is applied is used to close the opening part of the second concave part of the groove part. The chance of skin touching the bottom can be reduced.

(4) The convex portion according to any one of (1) to (3), wherein a distance between the first surface and the second surface in the convex portion is the largest at the top portion. Absorbent article.
Thereby, even if the medicine applied to the second bottom of the second recess moves in the direction of the projection, the top of the projection that is most likely to come into contact with the skin is thick in the projection. Since the distance (the distance between the first surface and the second surface) is the largest, the drug is unlikely to reach the first surface side of the convex portion. Thereby, the opportunity which the said chemical | medical agent touches skin can be suppressed more stably.

(5) The said convex part is an absorbent article as described in any one of said (1)-(4) in which the part by the side of the said 2nd surface in the said top part is not joined to the said absorber.
Thereby, a space is formed between the second surface side of the convex portion in the top sheet and the absorber. As a result, since the distance between the top part of the convex part and the second bottom part can be kept as large as possible, the medicine applied to the second bottom part becomes more difficult to touch the skin.

(6) The top sheet is curved in a shape in which the region of the first surface and the region of the second surface of the convex portion are convex from the second surface toward the first surface, The region of the first surface and the region of the second surface in the first recess of the groove portion have a configuration that is curved into a shape that is convex from the first surface toward the second surface, The absorbent article according to any one of (1) to (5).
Accordingly, the convex portion and the first concave portion of the top sheet are deformed in the thickness direction, the width direction, or the length direction in synchronization with the region of the first surface and the region of the second surface. Therefore, the flexibility of the entire convex portion and the entire first concave portion can be stably secured. Furthermore, since the region of the first surface and the region of the second surface of the convex portion are separated from the second concave portion, the distance between the top portion of the convex portion and the second bottom portion is also separated, Opportunities for the drug applied to the second bottom to directly touch the wearer's skin are reduced.

(7) The said absorbent article is provided with the pressing groove which squeezed the said top sheet and the said absorber toward the said thickness direction in the surface at the side of the said top sheet, The said (1)-(6) The absorbent article as described in any one.
Thereby, while the said pressing groove improves the joint strength of the said top sheet and the said absorber, when the said 2nd recessed part exists separately from the said 1st recessed part, the said top sheet is pulled by pressing. In addition, the second concave portion can buffer and reduce the tension, and the influence of the tension on the first concave portion and further on the convex portion adjacent to the first concave portion can be reduced. As a result, it is possible to suppress a decrease in the flexibility of the top sheet due to the influence of the compressed groove, and it is also possible to minimize the collapse of the shape of the convex portion and the first concave portion due to the tension. 2 The contact of the skin with the concave portion can be suppressed, and the contact of the medicine applied to the second bottom portion with the skin can also be suppressed.

According to the absorbent article of the present invention, the top sheet is coated with a volatile chemical on the second surface of the second bottom of the second recess, and the second bottom is the most fiber in the top sheet. Since the density is high, it is difficult for the drug to move to other portions, particularly convex portions that are easily in contact with the skin.
Moreover, since the said 2nd bottom part is the furthest away from the top part of the said convex part in the thickness direction of the said absorbent article in the said top sheet, the opportunity which the said chemical | medical agent touches skin is suppressed as much as possible. Can do. This is particularly effective when the drug is a substance that irritate the skin.
Therefore, even when the medicine is applied to the top sheet, it is possible to prevent the wearer from directly touching the medicine, making it difficult to be stimulated by the medicine and deteriorating the feeling of use. Is possible.

FIG. 1 is a plan view schematically showing a sanitary napkin which is an embodiment of the absorbent article of the present invention. FIG. 2 is a schematic cross-sectional view taken along the line II of FIG. FIG. 3 is an enlarged plan view of a main part of FIG. FIG. 4 is a schematic enlarged cross-sectional view of a main part taken along line II-II in FIG. FIG. 5 is an enlarged cross-sectional view of a main part of FIG. However, the white arrow in the figure indicates the direction in which the volatilized medicine or air flows. 6 is a schematic enlarged cross-sectional view of a main part taken along line III-III in FIG. FIG. 7 is a view schematically showing a manufacturing apparatus for manufacturing the absorbent article according to the present invention. FIG. 8 is a perspective view schematically showing a stretching roll of the shaping apparatus in FIG. FIG. 9 is a schematic diagram for explaining the arrangement of the pins of the lower drawing roll. FIG. 10 is an enlarged view of an essential part schematically showing the meshing state of the upper stretching roll and the lower stretching roll. FIG. 11 is a partially broken perspective view schematically showing a continuous top sheet (top sheet, shaped sheet) used in the absorbent article of the present invention. FIG. 12: is the (a) principal part top view which shows the state which folded the wing part typically, (b) The principal part expanded sectional view in IV-IV of (a).

FIGS. 1-6 shows one Embodiment of the absorbent article of this invention, In this embodiment, the case where an absorbent article is a sanitary napkin is demonstrated.
Specifically, the sanitary napkin 1 has a length direction (L), a width direction (W), and a thickness direction (D), and a top sheet 2 as a liquid-permeable layer, and a top sheet 2 A back sheet 3 as a liquid-impermeable layer disposed on one surface side, and an absorbent body 4 disposed between the top sheet 2 and the back sheet 3. In addition, the sanitary napkin 1 is provided on both ends in the width direction of the sanitary napkin 1 and is fixed to the crotch portion of the underwear during use. 7 is provided.
The back sheet 3 and the wing part 7 are provided with an adhesive sheet 8 for attaching the sanitary napkin 1 to the crotch part of the underwear.

The back sheet 3 is provided on the user's underwear side (the lower surface side of the absorbent body 4 in FIG. 2) of the sanitary napkin 1, and prevents the discharged excretion fluid from permeating and leaks to the underwear or the like. Is to prevent. In this embodiment, the back sheet 3 has a shape including the shape of the wing portions 7 and 7 in a plan view (in this case, the shape viewed from the direction of the top sheet 3).
The back sheet 3 is bonded to the top sheet 2 and the peripheral portion thereof with the absorber 4 being sandwiched between the back sheet 3 and the top sheet 2.

The absorbent body 4 absorbs excretory fluid such as menstrual blood. In this embodiment, the absorbent body 4 contains an absorbent material that absorbs and retains excreted fluid. The absorbent body 4 is formed long in the direction along the length direction of the sanitary napkin 1 so that both end sides in the length direction protrude outwardly in the length direction of the absorbent body 4. It is formed in a substantially oval shape in plan view smaller than the top sheet 2 and the back sheet 3, which is curved and has a certain thickness. In addition, as for the absorber 4 of this embodiment, both the surface by the side of a top sheet and the surface by the side of a back seat | sheet are formed in flat form.
The thickness, basis weight, and the like of the absorbent body can be appropriately adjusted according to the characteristics (for example, absorbency, strength, lightness, etc.) that the sanitary napkin should have. The thickness of the absorber is usually 0.1 to 15 mm, preferably 1 to 10 mm, more preferably 2 to 5 mm, and the basis weight is usually 20 to 1000 g / m ² , preferably 50 to 800 g / m ² , and further Preferably it is 100-500 g / m < ² >. The thickness, basis weight, etc. of the absorbent body 4 may be constant over the entire absorbent body or may be partially different.

  Further, the absorbent body 4 has a top sheet 2 on the surface on the top sheet side (the upper surface side of the absorbent body 4 in FIG. 2) and a back sheet 3 on the surface on the back sheet side (the lower surface side of the absorbent body 4 in FIG. 2). ) And an adhesive such as a hot melt adhesive.

The side sheet 6 prevents the excretion fluid from the user from leaking outside from both sides in the width direction of the sanitary napkin 1. Each of the side sheets 6 and 6 covers a part of both side portions of the top sheet 2 in the width direction, and a portion of the back sheet 3 corresponding to the pair of wing portions 7 and 7. The side surface is covered.
In addition, it is preferable to use the nonwoven fabric which has hydrophobicity or water repellency for the said pair of side sheets 6 and 6 so that the leakage of a bodily fluid can be prevented.

And the top sheet 2 is in contact with the skin of the wearer and quickly absorbs or permeates the excretion fluid from the wearer and transfers it toward the absorbent body 4. It is arrange | positioned at the surface side (The upper surface side of the absorber 4 in FIGS. 1-6) which opposes.
In this embodiment, the top sheet 2 is formed long in the direction along the length direction of the sanitary napkin 1.
The top sheet 2 is formed of, for example, a nonwoven fabric, a woven fabric, a synthetic resin film in which liquid permeation holes are formed, a net-like sheet having a mesh, and the like, among which a nonwoven fabric is preferable.

In this embodiment, in order to improve the strength of the top sheet 2, a nonwoven fabric containing thermoplastic resin fibers is used.
In the present invention, examples of the thermoplastic resin constituting the thermoplastic resin fiber include polyolefin, polyester, polyamide, and the like. Examples of the polyolefin include, for example, linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), polypropylene, polybutylene, and copolymers based on these (for example, Ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-acrylic acid copolymer (EAA), ionomer resin), and the like. Examples of polyesters include, for example, linear or branched carbon numbers up to 20 including polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polylactic acid, and polyglycolic acid. Examples thereof include polyesters such as polyhydroxyalkanoic acid, copolymers based on these, and copolymerized polyesters obtained by copolymerizing alkylene terephthalate as a main component with a small amount of other components. Examples of the polyamide include 6-nylon and 6,6-nylon. The fineness of the thermoplastic resin fiber is usually 1.1 to 8.8 dtex, preferably 2.2 to 5.6 dtex, and the fiber length is usually 20 to 100 mm, preferably 35 to 65 mm. The thermoplastic resin fiber may be subjected to a hydrophilization treatment. Examples of the hydrophilization treatment include a treatment using a surfactant, a hydrophilic agent, etc. (for example, kneading a surfactant into the fiber, fiber And the like) and the like.

Here, as shown in FIGS. 3 to 6 and FIG. 11, the top sheet 2 includes a first surface 2a located on the side opposite to the absorber 4, and an absorber on the side opposite to the first surface 2a. 4 side second surface 2b.
The top sheet 2 extends in the length direction and is formed at a predetermined interval in the width direction and protrudes in the direction of the first surface 2a (the direction opposite to the absorber 4). And a plurality of grooves 12 extending in the length direction and formed between the protrusions 11 and recessed toward the second surface 2b (in the direction of the absorber 4). Have.

The groove portion 12 includes a first concave portion 21 having a first bottom portion 22 located in the direction of the absorber 4 rather than the position of the first surface 2a at the top portion 13 of the convex portion 11 (the most protruding portion in the convex portion). The first recess 21 includes a plurality of second recesses 26 that are provided in a discontinuous manner in the length direction and are formed in a hollow shape that opens to the first bottom 22.
The second recess 26 is provided so as to block the peripheral wall 27 extending from the first bottom 22 toward the absorber 4 and the end of the peripheral wall 27 on the absorber 4 side so as to block the end. And the second bottom portion 28 having the highest fiber density in the top sheet 2.
Furthermore, the volatile chemical | medical agent 9 is apply | coated to the 2nd bottom part 28 of this 2nd recessed part 26 including the 2nd surface 2b of this 2nd bottom part 28 substantially.

Regarding the top sheet 2, the convex portion 11 is not joined to the absorbent body 4 at the second surface 2 b of the top portion 13, and the groove portion 12 is the top sheet of the absorbent body 4 at the second bottom portion 28 of the second concave portion 26. It is joined to the side portion by the adhesive layer 10 made of the adhesive.
On the other hand, as shown in FIGS. 3 to 6, in this embodiment, a part of the second surface 2 b of the first bottom portion 22 of the first recess 21 is also formed on the top sheet side portion of the absorbent body 4. On the other hand, with respect to the convex portion 11, the portion of the second surface 2 b including the top portion 13 is not joined to the absorber 4. Thereby, since the convex part 11 can deform | transform comparatively freely, the softness | flexibility with respect to a wearer's skin can be ensured.
Further, since the portion on the second surface 2 b side of the top portion 13 of the convex portion 11 is not joined to the absorber 4, a space is formed between the second surface 2 b side of the convex portion 11 and the absorber 4. For this reason, the distance between the top part 13 of the convex part 11 and the 2nd bottom part 28 can be ensured more stably, and the chemical | medical agent 9 apply | coated to the 2nd bottom part 28 becomes difficult to touch skin. In particular, in the case of this embodiment, since the entire second surface 2b side of the convex portion 11 is not joined to the absorber 4, there is a space between the second surface 2b side of the convex portion 11 and the absorber 4. The distance between the top part 13 of the convex part 11 and the 2nd bottom part 28 can be maintained more stably by this, and the chemical | medical agent of the 2nd bottom part 28 becomes much more difficult to touch skin.

As shown in FIGS. 4 to 6 and 11, in the top sheet 2 of this embodiment, the region of the first surface 2 a and the region of the second surface 2 b forming the convex portion 11 are changed from the second surface 2 b to the first surface. It has a configuration curved in a convex shape toward the direction 2a (that is, the direction opposite to the absorber 4). On the other hand, the first concave portion 21 of the groove portion 12 has the first surface 2a region and the second surface 2b region forming the first concave portion 21 in the direction from the first surface 2a to the second surface 2b (that is, the absorber). 4 direction) is curved into a convex shape. Therefore, the top sheet 2 is formed in a sheet shape having a substantially corrugated cross section in which irregularities are alternately repeated in the width direction.
Thereby, when the external force from a wearer etc. acts on the convex part 11 of the top sheet 2, the area | region of the 1st surface 2a and the area | region of the 2nd surface 2b synchronize, a thickness direction, a width direction, or Since it deforms in the length direction, the flexibility of the entire convex portion 11 can be stably secured. Moreover, since the area | region of the 1st surface 2a of the convex part 11 and the area | region of the 2nd surface 2b become a shape away from the 2nd recessed part 26, the distance between the top part 13 and the 2nd bottom part 28 of the convex part 11 is made. It can be secured more stably. As a result, it is possible to more stably suppress the chance that the medicine 9 applied to the second bottom portion 28 directly touches the wearer's skin. Further, the first concave portion 21 is also deformed in the thickness direction and the width direction in synchronization with the region of the first surface 2a and the region of the second surface 2b. Flexibility can be stably secured.
In this embodiment, the convex portion 11 and the groove portion 12 of the top sheet 2 have an intermediate height between the first surface 2a of the top portion 13 of the convex portion 11 and the first surface 2a of the first concave portion 21. A region away from the absorber 4 with the position as a boundary is a convex portion 11, and a region near the absorber 4 is a groove portion 12.

The protrusions 11 extend in the length direction of the sanitary napkin 1, that is, in the length direction of the top sheet 2, and are arranged in a plurality of rows at predetermined intervals in the width direction of the top sheet 2. Yes. In this embodiment, each convex part 11 is continuously extended in the length direction so as to be parallel to the other convex parts 11.
Moreover, in this embodiment, the convex part 11 has the largest distance in the top part 13 between the 1st surface 2a in the convex part 11 and the 2nd surface 2b. That is, the convex part 11 has the thickest part of the top part 13. Thereby, even if the medicine 9 applied to the second bottom portion 28 of the second concave portion 26 moves in the direction of the convex portion 11 along the peripheral wall portion 27, the first bottom portion 22 and the like, the moving medicine 9 remains on the skin. It is possible to substantially increase the movement distance until the first surface 2a of the top portion 13 of the convex portion 11 that is most likely to come into contact with the first surface 2a. As a result, since the moving drug 9 is difficult to reach the first surface 2a of the top portion 13 of the convex portion 11 in terms of distance or time, the opportunity for the drug 9 to touch the skin can be more stably suppressed. .

As for the convex part in this invention, it is preferable that the space | interval between adjacent convex parts is 0.25-5 mm, More preferably, it is 0.5-3 mm, More preferably, you may be 0.75-2 mm. That is. In addition, the space | interval between adjacent convex parts here refers to the distance between the approximate center positions (substantially the top part of a convex part) of the width direction of the top sheet in each convex part.
If the distance between adjacent convex portions is less than 0.25 mm, it is difficult to say that the top sheet forms an uneven structure, and the contact area with the skin due to the convex portions cannot be substantially reduced. Therefore, there is a possibility that the touch may be lowered. On the other hand, if it exceeds 5 mm, there is no great difference from the non-woven fabric to be processed before processing, so that a soft touch making use of the unevenness cannot be obtained.

As shown in FIGS. 4 and 5, the distance between the portion of the second surface 2 b in the top portion 13 of the convex portion 11 and the portion on the top sheet side of the absorber 4 is the first surface of the first bottom portion 22. In 2a, it is smaller than the distance between the portion closest to the absorber 4 and the portion of the absorber 4 on the top sheet side. Therefore, the top portion 13 of the convex portion 11 is disposed at a position farther from the top sheet 2 than the first bottom portion 22 (on the upper side in FIGS. 4 and 5).
Thereby, since space is stably formed between the 2nd surface 2b of the convex part 11, and the surface at the top sheet side of the absorber 4, the external force from a wearer in the convex part 11 of the top sheet 2, especially Even if a shearing force in the width direction accompanying friction with the wearer's skin or the like is applied, the convex portion 11 is deformed or crushed using the space according to the direction and magnitude of the external force and absorbs the force. It becomes easy to do. In particular, when the convex portion 11 is crushed, the convex portion 11 is pushed into the space between the second surface 2b side and the absorber 4, and the first surface 2a of the convex portion 11 and the first concave portion 21 (first Since the difference in height between the bottom 22) and the first surface 2a is reduced, the shearing force in the width direction can be further reduced. Therefore, the flexibility of the top sheet 2 can be maintained more stably, the tension of the top sheet 2 generated by rubbing between the top sheet 2 and the skin of the wearer is reduced, and the absorbent body 4 of the top sheet 2 is reduced. Peeling is also suppressed.

The first concave portion 21 is formed integrally with the convex portion 11 in the width direction. In addition, the first bottom portion 22 of the first recess 21 is the thickest in the top sheet 2 as a whole, and the first bottom portion 22 is a portion having excellent elasticity as a whole. The plurality of first recesses 21 formed in the top sheet 2 are all formed to have the same width.
Further, in this embodiment, the second surface 2b of the first bottom portion 22 of the first recess 21 is at least the portion of the first bottom portion 22 located closest to the absorber, that is, the height of the top portion 13 of the protrusion 11. A portion at a position farthest from the position and a portion in the vicinity thereof are joined to a portion on the top sheet side of the absorbent body 4.

Here, in this embodiment, the height from the top sheet side surface of the absorbent body 4 to the first surface 2a of the top portion 13 of the convex portion 11 is made larger than the size of the groove portion 12 in the width direction. The size of the groove 12 in the width direction is substantially the size of the first recess 21 in the width direction.
Thereby, when the convex part 11 of the top sheet 2 falls in the width direction, that is, when a shearing force in the width direction acts on the convex part 11 due to the movement of the wearer's skin, the collapsed convex part 11 is Covering the groove 12, the opening of the second recess 26 is entirely or partially closed. Therefore, the chance that the wearer's skin touches the second bottom portion 28 of the second recess 26 to which the drug 9 is applied can be reduced, and damage to the skin directly from the drug 9 can be suppressed. .

  The second recess 26 has a substantially rectangular opening in a plan view (as viewed from the first surface 2a of the top sheet 2), protrudes toward the absorber 4 of the top sheet 2 as a whole, and has a substantially rectangular parallelepiped shape. It has an internal space. The second recesses 26 are arranged at regular intervals in the length direction of each groove portion 12, more specifically in the length direction of the first recess portion 21. The second recesses 26 are formed independently of each other.

The peripheral wall portion 27 includes a pair of first peripheral wall portions 29 and 29 formed along the length direction of the top sheet 2 and a pair of second peripheral wall portions 30 formed along the width direction of the top sheet 2. , 30. The pair of first peripheral wall portions 29 and 29 are disposed at positions facing each other, and the pair of second peripheral wall portions 30 and 30 are also disposed at positions facing each other.
As shown in FIGS. 4 to 6, the pair of first peripheral wall portions 29 and 29 are respectively formed with hole portions 31 that lead from the internal space of the first recess 21 to the second surface 2 b.
In this embodiment, one hole portion 31 is provided in each of the pair of first peripheral wall portions 29, 29, and these hole portions 31 are close to the second bottom portion 28 in the first peripheral wall portion 29. (Thus, there are two holes 31 in one second recess 26). On the other hand, there is no pair of second peripheral wall portions 30, 30 corresponding to the hole portion 31, and each end portion of the second peripheral wall portion 30 on the absorber 4 side is directly connected to the second bottom portion 28. Are connected to each other.

Here, the provision of the second concave portion 26 in the top sheet 2 reduces the chance that the groove bottom of the groove portion 12, more specifically, the first bottom portion 22 of the first concave portion 21 comes into contact with the skin as much as possible. This is because even when the bottom portion 22 touches the skin, the contact area is minimized.
That is, in the present invention, it is easy to touch the skin in the order of the convex part of the top sheet and then the first bottom part of the first concave part, but the convex part (particularly the top part) that is not joined to the absorber is the most flexible, It is preferable that the convex portion has more opportunities to touch the skin than the first bottom portion. In addition, as the top sheet, it is easy to feel flexibility when the contact area with the skin is small. Therefore, by providing the second concave portion and forming the portion where the first concave portion does not exist, the first bottom portion of the first concave portion has fewer portions in contact with the skin, and the chance of hitting the skin is relatively reduced. The contact area is made as small as possible even if the skin touches the first bottom portion.
The second recess is provided on the first bottom because the second recess is provided on the first bottom of the first recess which is less likely to touch the skin than the protrusion, thereby providing an opportunity for the second recess to touch the skin. This is to minimize the uncomfortable feeling and foreign object feeling due to the second recess as much as possible. Therefore, since the second bottom portion farthest from the convex portion in the second concave portion has a smaller chance of touching the skin, by applying the chemical to the second bottom portion, the opportunity for the chemical to directly touch the skin. Will be stably suppressed.

Furthermore, in this embodiment, the hole 31 is provided in the peripheral wall 27 to prevent the volatile drug 9 applied to the second bottom 28 from volatilizing directly toward the skin as much as possible. This is to relieve skin irritation caused by the drug 9. Moreover, it is for preventing the chemical | medical agent 9 apply | coated to the 2nd bottom part 28 moving to the direction of the convex part 11 through the surrounding wall part 27. FIG. Furthermore, this is because an air flow is created in the second recess 26 so that the moving direction of the volatilized medicine can be controlled to some extent.
That is, a volatile drug such as a refreshing agent such as menthol volatilizes and moves in the second recess 26 and is released toward the wearer's skin. At this time, all of the volatilized drug goes to the skin. And the irritation may be too strong. Therefore, as shown in FIG. 5, a part of the volatilized medicine 9 is moved from the inside of the second recess 26 to the second surface 2 b side through the hole 31 and directly moves in the direction of the skin. The amount of the volatilized drug 9 can be suppressed.
Further, the medicine 9 applied to the second bottom portion 28 may move in the direction of the convex portion 11 through the peripheral wall portion 27, but the range in which the medicine 9 can move the peripheral wall portion 27 by the hole 31 is made as narrow as possible. This prevents movement of the medicine 9 through the peripheral wall portion 27.
Further, as shown in FIG. 5, since the air flow is formed by allowing the air to enter and exit through the hole portion 31 into the second recess 26, the volatilized drug 9 riding on the air flow is removed. Can be moved. For example, the effect of the drug 9 can be diffused by placing the volatilized drug on the air flowing through the space between the second surface 2 b side of the top sheet 2 and the absorber 4. Or about the chemical | medical agent 9 of the 2nd bottom part 28 in which the effect became thin by volatilization, the flow of the air which makes the direction to volatilize toward the opening direction of the 2nd recessed part 26 is formed, and the effect of the chemical | medical agent 9 with respect to skin is maintained as long as possible. You can do it. The air flow can be generated when the absorber 4 or the top sheet 2 is deformed.

In this embodiment, the hole 31 is provided in the first peripheral wall 29 because the fiber tension of the protrusion 11 adjacent to the groove 12 where the hole 31 is provided is released, and the protrusion 11 This is to improve the freedom of movement of the whole or the fibers forming the convex portion 11. As a result, the flexibility of the convex portion 11, more specifically, the flexibility of the convex portion 11 in the thickness direction of the top sheet 2, and the skin in the length direction and the width direction (particularly the width direction) of the top sheet 2. The softness | flexibility at the time of sliding can be improved and a smooth touch can be ensured. Therefore, the convex part 11 has an excellent hardness and softness (excellent softness in the thickness direction) and an excellent rough feeling in the length and width directions (excellent surface (particularly in the width direction)). Smoothness), it is possible to ensure excellent softness and rough feeling of the top sheet 2 as a whole, and to realize a soft touch.
On the other hand, the hole 31 is not provided in the second peripheral wall 30 because the second sheet is slid when the skin is slid in the length direction of the top sheet 2, that is, in the direction in which the protrusions 11 and the grooves 12 extend. This is to prevent the step due to the presence of the recess 26 from being caught on the skin and to ensure the smoothness of the top sheet 2 in the length direction. That is, since the second peripheral wall portion 30 is continuous with the first bottom portion 22 and the second bottom portion 28 and is seamlessly integrated, when the skin is slid in the length direction of the top sheet 2, Does not feel the level difference of the first bottom portion 22 due to the second recess 26. Thereby, since it becomes easy to move skin smoothly along the convex part 11 and the groove part 12, the smoothness to the length direction of the top sheet 2 is securable.
Furthermore, the hole 31 is provided at a position near the second bottom portion 28 in the first peripheral wall portion 29 because the hole 31 is moved away from the convex portion 11 and the first bottom portion 22 that are easily touched by the skin as much as possible. This is to reduce the chance that 31 touches the skin as much as possible, and to make it difficult to feel a sense of incongruity or foreign matter due to the hole 31. Thereby, the smoothness when sliding the skin in the plane direction of the top sheet 2 can be more stably ensured. In addition, there is an advantage that the volatilized medicine 9 can be easily distributed into and out of the second recess 26 through the hole 31.

As shown in FIG. 6, the hole 31 is formed by breaking the thermoplastic resin fiber contained in the top sheet 2 without melting the thermoplastic resin fiber. The peripheral edge of 31 includes a broken end portion of a broken fiber having a broken end portion formed by breaking the thermoplastic resin fiber among the thermoplastic resin fibers. The broken end portion of the broken fiber is formed by being broken by pulling or physically cutting in the length direction of the thermoplastic resin fiber, and when the thermoplastic resin fiber is melted. As described above, the end of the fiber is not melted and rounded to increase the fiber diameter, and the fiber is tapered due to tearing, or the fiber diameter hardly changes.
Therefore, even if the skin of the wearer touches the peripheral edge of the hole portion 31, there is no thermoplastic resin fiber cured by melting at the peripheral edge. Feeling the hardness and roughness of the is suppressed.

Further, the internal space of the hole portion 31 is in a state in which the thermoplastic resin fibers spanned in the internal space and a part of the extended thermoplastic resin fibers are mixed and completely opened. It is not a space.
Thus, since the hole 31 has a part of the thermoplastic resin fiber stretched over or extended in the internal space, even if the skin touches the hole 31, The thermoplastic resin fiber can reduce the level difference between the first peripheral wall portion 29 or the second bottom portion 28 of the second recess 26 and the hole portion 31, and can suppress the uncomfortable feeling of the touched person.
In addition, it is preferable to make the open area ratio of the internal space of the hole at this time into 1 to 50%, More preferably, it is 1.5 to 35%, More preferably, it is 2.5 to 20%. . If the opening ratio of the internal space of the hole is less than 1%, the opening ratio is too low to give a degree of freedom to the convexity and the fibers forming the convexity, and the convexity becomes flexible. We cannot secure enough. On the other hand, if it exceeds 50%, the strength of the first peripheral wall portion provided with the hole portion tends to be low, and the boundary between the peripheral edges of the hole portion may be easily understood on the touch. However, the open area ratio of the internal space of the hole may be outside the above range depending on the type or application of the absorbent article, and can be arbitrarily set.

The second bottom portion 28 is formed by compressing the fibers constituting the top sheet 2 in the direction from the first surface 2a to the second surface 2b. The fiber density is high and the rigidity is the largest.
Thus, by making the fiber density of the second bottom portion 28 the highest in the top sheet 2, the drug 9 applied to the second bottom portion 28 is affected by the capillary phenomenon, and this second bottom portion It is difficult to move to the peripheral wall portion 27 having a fiber density lower than 28. Therefore, it can suppress that the chemical | medical agent 9 moves toward the convex part 11 from the 2nd bottom part 28, and can suppress the chemical | medical agent 9 touching a wearer's skin directly as much as possible.

Furthermore, the first surface 2a (that is, the internal space side of the second recess 26) and the second surface 2b (that is, the absorber 4 side) of the second bottom portion 28 are formed in a planar shape as a whole. In this embodiment, the surface of the second surface 2b of the second bottom portion 28 is a substantially flat surface and is in contact with the surface of the absorber 4 on the top sheet side.
Thus, since the surface of the 2nd surface 2b of the 2nd bottom part 28 is flat shape, the contact area of the 2nd bottom part 28 and the absorber 4 can be enlarged as much as possible. As a result, the top sheet 2 is less likely to be peeled off from the bonded absorbent body 4, and the excretory liquid can be more smoothly transferred between the top sheet 2 and the absorbent body 4. In particular, in this embodiment, as described above, the surface of the absorber 4 on the top sheet side is a flat surface, and the second surface 2b of the second bottom portion 28 is the top sheet side of the absorber 4. Since they are joined to each other in surface contact with each other, they are more difficult to peel off and the excretory fluid can be transferred very smoothly. In addition, since the surface of the second surface 2b of the second bottom portion 28 is flat, there is an advantage that the drug 9 can be easily applied by a coater roll or the like when the sanitary napkin 1 is manufactured.

Here, as shown in FIG. 3, in this embodiment, the 2nd recessed part 26 is arrange | positioned in zigzag form in planar view (when seeing in the thickness direction) of the top sheet 2. As shown in FIG.
As shown in FIG. 4, in the top sheet 2, at least two convex portions 11 are positioned between the second concave portion 26 and another second concave portion 26 adjacent to the second concave portion 26 in the width direction. It has become the composition. That is, the top sheet 2 has a configuration in which the convex portion 11, the first concave portion 21, and the convex portion 11 are arranged in this order between the adjacent second concave portions 26 and the second concave portions 26 in the width direction. Thus, at least one first recess 21, particularly the first bottom portion 22, is present. Therefore, in the width direction of the top sheet 2, the first bottom portion 22 is positioned between the second bottom portion 28 and the other second bottom portion 28 adjacent to the second bottom portion 28. As described above, when the tension is generated in the top sheet 2 by positioning the first bottom portion 22 between the adjacent second bottom portions 28 and 28, which has a fiber density lower than that of the second bottom portion 28 and easily deforms. The tension can be reduced and absorbed as much as possible by the deformation of the first bottom portion 22. Thereby, the freedom degree of the convex part 11 is not inhibited, the softness | flexibility of the convex part 11 can be maintained stably, and it is also suppressed that the top sheet 2 peels from the absorber 4. FIG.

By the way, the volatile chemical | medical agent 9 is applied from the 2nd surface 2b side of the 2nd bottom part 28, and has become the state made to impregnate even the inside of this 2nd bottom part 28. FIG. In this embodiment, the drug 9 is applied from the second surface 2 b side of the second bottom portion 28, but is diffused and impregnated over almost the entire second bottom portion 28.
Here, with respect to the volatility in the present invention, the preferred vapor pressure varies depending on the function to be exhibited by the functional component, but for example, it preferably has a vapor pressure of 1 Pa or more at 20 ° C. If the vapor pressure is too low, it tends to be difficult to perform a desired function. Conversely, if the vapor pressure is too high, the functional component volatilizes before the user uses the absorbent article, The amount may tend to decrease or the wearer's skin may perform excessively.
The volatile drug used in the present invention includes those having a cooling sensation function, such as those acting on the receptor activation channel (TRPM8) in the nerve of the skin, such as a natural cooling agent (for example, menthol (for example, I -Menthol) and derivatives thereof (menthyl lactate), peppermint oil, camphor, borneol, eucalyptol, eucalyptus oil, tea tree oil), ketals, carboxamides, cyclohexanol derivatives, cyclohexyl derivatives and the like.
Other agents include those that lower the ambient temperature by heat of vaporization, such as alcohols such as methanol and ethanol.
Moreover, as an application method, for example, a contact-type method in which a coater roll or the like having a volatile drug attached to the outer peripheral surface is brought into contact with the second surface of the second bottom portion, or a drug is sprayed. Any method can be selected as long as the medicine can be reliably applied to the second surface of the second bottom, such as a non-contact type that is applied to the second bottom by spraying or the like.
Further, the application amount of the drug is preferably 0.001 g to 0.1 g, and more preferably 0.005 g to 0.05 g, although it depends on the type of the drug. If the applied amount of the drug is less than 0.001 g, the function cannot be sufficiently exerted on the skin (for example, it is difficult to feel a cool sensation in the case of one having a cold sensation function). Too much skin may hurt.

Moreover, as shown in FIG.1 and FIG.2, the top sheet 2 and the absorber 4 were squeezed to the sanitary napkin 1 of this embodiment by embossing the surface at the side of a top sheet in the thickness direction. A plurality of compressed grooves 41 to 43 are provided.
The sanitary napkin 1 according to this embodiment is formed long in the length direction of the sanitary napkin 1 as a whole, which is located on the outermost side in a plan view (when viewed from the thickness direction) among the plurality of compressed grooves. An annular first compressed groove 41 and a pair of second compressed grooves 42 extending in the length direction, located inside the first compressed groove 41 and positioned substantially in the center in the length direction of the sanitary napkin 1 , 42 are provided. Furthermore, a pair of third squeezing grooves 43 and 43 extending in the width direction are provided which are located inside the first squeezing groove 41 and in the vicinity of both ends in the length direction of the first squeezing groove 41. .

Thus, the reason why the pressing grooves 41 to 43 are provided is to make the bonding between the top sheet 2 and the absorbent body 4 stronger by the pressing of the pressing grooves 41 to 43. Moreover, it is for raising the fiber density between the top sheet 2 and the absorber 4, and improving the drawing property of the excretion liquid from the top sheet 2 to the absorber 4. FIG.
Here, generally, when the top sheet and the absorbent body are squeezed in the thickness direction to form a compressed groove, the compressed groove is in a state of pulling the top sheet in the direction of the absorbent body. For example, the top sheet, in particular, the convex portion tends to be stretched and stretched, and the convex portion is deformed to reduce flexibility. The tendency is particularly remarkable in the vicinity of the compressed groove.

However, in the case of the present invention, the second concave portion of the groove portion of the top sheet joined to the absorber prevents or reduces the tension generated in the top sheet due to the pressing groove. The influence of the tension on the convex part and the first concave part is suppressed.
That is, when tension is generated in the top sheet by pressing, the second concave portion is deformed with the second bottom portion being bonded to the absorber, and the peripheral wall portion is deformed to buffer the tension and to the other portion. Stop spreading or reduce its tension and deter spreading to other parts. This minimizes the effect of tension on the top sheet due to the squeezing, and the top sheet is unlikely to deform except for parts that are greatly affected by direct deformation due to the squeezing, and there is no tension associated with the tension. Few.

Therefore, in the present invention, while suppressing the decrease in flexibility of the top sheet due to the influence of the pressing groove while further strengthening the bonding between the top sheet and the absorbent body by the pressing groove, The collapse of the shape of the first concave portion can also be suppressed to a minimum, and the good touch of the top sheet can be maintained. In addition, since the collapse of the shape of the convex part and the first concave part is suppressed, and the chance of the second concave part, particularly the second bottom part contacting the skin, can be reduced. It is also possible to prevent the skin from directly touching the medicine applied to the second bottom.
Further, in the case of this embodiment, the peripheral wall portion 27 is cut out by the hole portion 31 formed in the peripheral wall portion 27 of the second recess 26 in the groove portion 12 of the top sheet 2, so that the peripheral wall portion 27 as a whole is formed. It is highly flexible and easily deformed, and the tension acting on the top sheet 2 is easily buffered. Further, as described above, the hole 31 releases the tension of the fiber of the convex part 11 adjacent to the groove part 12, thereby improving the degree of freedom of movement of the entire convex part 11 or the fibers forming the convex part 11. It is easy to reduce the tension acting on the top sheet 2. Thereby, the tension | tensile_strength which generate | occur | produces in the length direction and the width direction of the top sheet 2 by pressing of a pressing groove can be suppressed effectively. The influence of the tension can be suppressed more stably.

In addition, in this embodiment, as shown in FIG. 1, in the top sheet side of the sanitary napkin 1, the part surrounded by the 2nd pressing grooves 42 and 42 and the 3rd pressing grooves 43 and 43, ie, a top A plurality of dot-shaped pressing portions 44 that squeeze the top sheet 2 and the absorbent body 4 are formed at substantially the center of the sheet 2. About this pressing part 44, similarly to the pressing grooves 41-43, although tension | tensile_strength can be generated to the top sheet 2 by the pressing, as mentioned above, the influence of the tension | tensile_strength produced by pressing by the effect | action of the 2nd recessed part 26 is suppressed. be able to.
Moreover, as thickness of the sanitary napkin 1 in the pressing part of this pressing groove 41-43 or the pressing part 44, although it depends also on the thickness of a top sheet or an absorber, the thickness of a pressing part is an absorber. The thickness is preferably less than 20%, more preferably 5% or less, still more preferably 3% or less.
When the thickness of the pressed portion is 20% or more of the thickness of the absorbent body, the pressing is insufficient and the desired fiber density cannot be obtained, so that the excretion of the excretory liquid is lowered and the strength against peeling is also reduced. In addition, about the depth of each pressing groove 41-43 and the pressing part 44, even if it is all the same depth, the mutually different depth may be sufficient.

Hereinafter, an example of the manufacturing method of the sanitary napkin which has the said structure is demonstrated.
The manufacturing method of the sanitary napkin 1 in this embodiment uses a top sheet continuous body formed in a step of forming an absorbent body and a step of forming a long top sheet continuous body to be a top sheet described later as an absorbent body. On the other hand, the step of laminating and forming the laminate of the continuous topsheet and the absorber and the step of forming the compressed grooves in the laminate are sequentially performed. Furthermore, a step of laminating a continuous backsheet continuous body serving as a backsheet to the laminate to form a sanitary napkin continuous body, and a cutting step of cutting out a single sanitary napkin from the sanitary napkin continuous body And sequentially.
Moreover, when manufacturing the sanitary napkin 1, the manufacturing apparatus 50 as shown, for example in FIGS. 7-10 is used.
The manufacturing apparatus 50 forms an absorbent body forming apparatus 60 including a rotatable suction drum 62 that forms the absorbent body 4 by laminating an absorbent material 61 and a top sheet continuous body 72 that becomes the top sheet 2. A top sheet forming device 70 and an embossing device 80 for forming the compressed grooves 41 to 43 by embossing the top sheet 2 and the absorbent body 4 are provided. Further, a backsheet roll 90 in which a backsheet continuous body 91 to be the backsheet 3 is wound in a roll shape, and a sanitary napkin continuous body 92 in which the topsheet continuous body 72 and the backsheet continuous body 91 are attached to the absorbent body 4. And a cutting device 100 that is used as an individual sanitary napkin 1.

In the absorbent body forming apparatus 60, the absorbent body 61 is supplied from above to the outer peripheral surface of the rotating suction drum 62, and the absorbent material 61 is supplied to the suction drum 62. The absorbent body 4 is formed by sucking into a hollow mold member 62 a provided on the outer peripheral surface and conforming to the shape of the absorbent body 4, and laminating the absorbent material 61.
Thereafter, the rotating suction drum 62 transfers and places the absorber 4 in the mold member 62 a onto the carrier sheet 65 being conveyed in the conveyance direction MD below the suction drum 62. The carrier sheet 65 is transported downstream in the transport direction MD together with the mounted absorbent body 4 and used for the next process.

The process of forming a laminated body is implemented after the process of manufacturing an absorber.
In this step, first, a top sheet continuous body 72 in which the top sheet 2 is continuous in the length direction and the shaped sheet 71 is coated with the drug 9 is formed by the top sheet forming apparatus 70 described in detail later. And the top sheet continuous body 72 is laminated | stacked and joined to the 1st surface (upper surface in FIG. 7) of the absorber 4 conveyed by conveyance direction MD through the adhesive bond layer by a hot-melt-type adhesive agent. Thus, a laminated body 67 is obtained. In addition, the laminated body 67 is conveyed downstream of the conveyance direction MD after the formation, and is provided to the next process.

The process of forming a pressing groove is implemented after the process of forming a laminated body.
In this step, by passing the laminate 67 between the upper roll 81 and the lower roll 82 in the embossing apparatus 80, the top sheet continuous body 72 and the absorbent body 4 are squeezed to form the compressed grooves 41 to 43. .
At this time, the upper roll 81 of the embossing device 80 includes a protrusion (not shown) arranged on the outer peripheral surface in accordance with the position and shape of the pressing grooves 41 to 43. The laminated body 67 is squeezed in the thickness direction from the surface on the top sheet continuous body 72 side, and the compressed grooves 41 to 43 are formed. The lower roll 82 has a flat outer peripheral surface, and stably supports the laminated body 67 when the laminated body 67 is compressed by the upper roll 81.
Moreover, in this process, a plurality of dot-shaped compressed parts 44 are also formed. Therefore, the upper stage roll 81 is provided with the projection part for forming the pressing part 44, and will be formed simultaneously with the pressing grooves 41-43. In addition, the laminated body 67 is conveyed downstream in the conveyance direction MD after formation of the pressing grooves 41-43 and the pressing part 44 is complete | finished, and is provided to the following process.

The process of forming the continuous body of a sanitary napkin is implemented after the process of forming a pressing groove.
In this step, the backsheet continuous body 91 unwound from the backsheet roll 90 is applied to the surface of the laminated body 67 on the absorbent body 4 side (in this case, the lower surface of the laminated body 67). A sanitary napkin continuous body 92 in which a plurality of sanitary napkins 1 are directly connected in the length direction is formed by sequentially stacking the layers. Thereby, the top sheet continuous body 72 is bonded to the first surface of the absorbent body 4, and the back sheet continuous body 91 is bonded to the surface opposite to the first surface (in this case, the lower surface of the absorbent body 4). Become.
The sanitary napkin continuum 92 is transported downstream in the transport direction MD and is subjected to the next process.

A cutting step is performed after the step of forming the sanitary napkin continuous body.
In this step, a single sanitary napkin having a desired shape and size is cut out from a sanitary napkin continuous body by a cutter provided in the cutting device 100.
Thereby, the sanitary napkin 1 as a product will be completed.

By the way, the process of forming the above-mentioned top sheet continuous body included in the process of forming a laminated body is performed as follows.
As a method of forming the top sheet continuous body 72 to be the top sheet 2, a long nonwoven fabric 73 to be processed, which is a raw material of the top sheet continuous body 72, is rolled from a top sheet roll 74 wound into a roll shape. 73, a preheating step for preheating the unwoven nonwoven fabric 73 to be processed, and a non-woven fabric 73 to be processed after the preheating step are stretched and shaped to form a shaped sheet 71. And forming process. Furthermore, the application | coating process which apply | coats the volatile chemical | medical agent 9 with respect to the shaping sheet 71 which the shaping process was complete | finished at the shaping process, and makes it the top sheet continuous body 72 is performed sequentially.

Further, the method of forming the top sheet continuous body is performed using a top sheet forming apparatus 70 as shown in FIGS. 7 to 10, and finally a top sheet continuous body 72 (as shown in FIG. FIG. 11 does not show the drug 9 applied to the second bottom 28.
The forming apparatus 70 preheats the non-woven fabric 73 to be processed, which is unwound from the top sheet roll 74, and the non-woven fabric 73 to be processed formed by unwinding from the top sheet roll 74. A preheating device 75 is provided. Furthermore, the shaping apparatus 76 which performs the shaping process for extending | stretching the nonwoven fabric 73 of the process target which gave preheating, and forming the convex part 11 and the groove part 12 (1st recessed part 21 and 2nd recessed part 26), and shaping An applicator 77 that applies the drug 9 to the shaped sheet 71 formed by processing is provided.
In addition, when forming the top sheet continuous body 72 as shown in FIG. 11, the shaped sheet 71 formed in the method of forming the top sheet continuous body 72 has a long length and is volatile. Since the configuration other than the fact that no chemical is applied is basically the same as that of the top sheet 2, the same reference numerals as those of the top sheet 2 are used and detailed description thereof is omitted. Further, the top sheet continuous body 72 is basically the same as the top sheet 2 except that the length direction is long. Detailed description is omitted.

  In the preheating step, the non-woven fabric 73 to be processed, which is unwound from the top sheet roll 74 and conveyed along the conveying direction MD, and is formed into a long sheet shape with a constant basis weight, Then, the outer peripheral surfaces of the rotating upper and lower pair of heating rolls 75a and 75b are sequentially brought into contact with each other, and both surfaces of the nonwoven fabric 73 to be processed are sequentially heated to apply preheating. That is, the non-woven fabric 73 to be processed unwound from the top sheet roll 74 is first wound around the outer peripheral surface of the lower heating roll 75b, and one side of the non-woven fabric 73 to be processed in contact with the outer peripheral surface is heated. Next, the nonwoven fabric 73 to be processed is transferred so that the surface opposite to the surface heated by the lower heating roll 75b is in contact with the outer peripheral surface of the upper heating roll 75a, and the surface in contact with the outer peripheral surface is The heating roll 75a is used.

Here, the preheating temperature depends on the type of the thermoplastic resin fiber constituting the nonwoven fabric to be processed, but for example, is higher than the temperature at which softening of the thermoplastic resin fiber used in the nonwoven fabric to be processed starts and below the melting point. Heating at a temperature is preferred.
If the preheating temperature is equal to or higher than the melting point, the thermoplastic resin fibers are dissolved and cured, so that the soft touch is impaired. Also, if the temperature is lower than the temperature at which the thermoplastic resin fibers begin to soften, bonding between the thermoplastic resin fibers is maintained, so it becomes difficult to shape the nonwoven fabric to be processed in the next shaping process, and appropriate unevenness Becomes difficult to form.
For example, when the nonwoven fabric to be processed is a core-sheath type composite fiber of polyethylene terephthalate (PET) and high density polyethylene (HDPE), the melting point temperature is 120 ° C., and the temperature at which softening starts is less than 50 ° C. The temperature of the outer peripheral surface of the roll is preferably about 50 to 110 ° C., more preferably about 60 to 100 ° C.

In the shaping step, the non-woven fabric 73 to be processed, which has been conveyed through the preheating step, is inserted between the pair of upper and lower drawing rolls 78 and 79 that rotate while meshing in the shaping device 76, By shaping the nonwoven fabric 73 between the protruding ridges 78a and concave grooves 78b of the upper drawing roll 78 engaged with each other and the concave portions 79b and pins 79a of the lower drawing roll 79, the shaping sheet 71 is formed. Form.
In addition, when implementing a shaping process, it is preferable to shape while heating the extending | stretching rolls 78 and 79 so that shaping may be performed easily. The heating temperature at this time is preferably higher than the preheating temperature in the preheating step and lower than the melting point temperature of the nonwoven fabric 73 to be processed.

Specifically, as shown in FIG. 8, the upper stretching roll 78 has a plurality of rows parallel to each other along the outer circumferential surface of the upper stretching roll 78 on the outer circumferential surface at regular intervals in the roll width direction. The above-described protruding ridge 78a and a plurality of rows of the above-described concave grooves 78b provided between adjacent protruding ridges 78a and 78a are provided.
On the other hand, the lower stretching roll 79 includes a plurality of pins 79a provided on the outer peripheral surface thereof so as to mesh with the concave groove 78b of the upper stretching roll 78, and a recess 79b meshing with the ridge 78a. As shown in FIGS. 8 and 9, these pins 79 a are arranged at a constant interval so as not to come into contact with the ridge 78 a of the upper extending roll 78 in the roll width direction. Is arranged substantially linearly at regular intervals along the outer peripheral surface. As shown in FIG. 9, the lower drawing roll 79 in this embodiment has a configuration in which a plurality of pins 79 a are arranged in a staggered manner on the outer peripheral surface of the lower drawing roll 79.

In carrying out the shaping step, as shown in FIG. 10, the upper drawing roll 78 has a portion where the ridge 78 a is in contact with the nonwoven fabric 73 to be processed in the recess 79 b of the lower drawing roll 79. To form the convex portion 11 of the top sheet 2 (shaped sheet 71, top sheet continuous body 72).
On the other hand, the lower drawing roll 79 has the same non-woven fabric 73 to be processed in which the plurality of pins 79a arranged in a line in the circumferential direction are in contact with the tip portions of the pins 79a as the same as the upper drawing roll 78. Push into the recessed groove 78b. At this time, in the non-woven fabric 73 to be processed, the portion pushed into the concave groove 78b in a non-contact state with the pin 79a is not stretched much compared to the other portions, and the top sheet 2 (shaped sheet 71, top It becomes the first bottom 22 of the first recess 21 of the groove 12 of the continuous sheet 72). Further, the portion that has been in contact with the tip portion of the pin 79a is strongly pushed into the concave groove 78b and shaped, whereby the top sheet 2 (shaped sheet) having the peripheral wall portion 27 and the second bottom portion 28. 71, the second concave portion 26 of the top sheet continuous body 72) is formed.
In addition, about the 2nd bottom part 28 of the 2nd recessed part 26, when the formation was carried out, the front-end | tip part of the pin 79a is in the state which the upper extending | stretching roll 78 and the lower extending | stretching roll 79 bited the nonwoven fabric 73 to be processed. Since the contact portion of the nonwoven fabric 73 to be processed is pushed into the concave groove 78b, the fiber density is substantially higher than the other portions, and the rigidity is improved. Accordingly, the overall rigidity of the top sheet 2 (shaped sheet 71, top sheet continuous body 72) is improved by the action of the second bottom portion 28 of the second recess 26.

Further, in the nonwoven fabric 73 to be processed, a portion of the tip 79a that is in contact with both end portions in the width direction (roll width direction) of the pin 79a has a protruding ridge 78a of the upper drawing roll 78 below the nonwoven fabric 73 to be processed. The pin 79a scrapes the thermoplastic resin fibers forming the first peripheral wall portion 29 of the peripheral wall portion 27 of the second concave portion 26, or the tension generated when it is pushed into the concave portion 79b of the drawing roll 79, or It breaks to form a broken fiber having the above-mentioned broken end.
As a result, a hole 31 is formed in the second recessed portion 26 so that the peripheral edge portion includes the broken end portion of the broken fiber. In addition, some thermoplastic resin fibers remain in a state of being spanned in the internal space of the hole portion 31, and a broken end portion of some of the broken fibers extends into the internal space of the hole portion 31. It becomes.
Here, the hole 31 is formed in the direction along the conveyance direction MD of the nonwoven fabric 73 to be processed, that is, the rotation direction of the stretching rolls 78 and 79, and the protrusion 11 and the groove 12 are extended. Therefore, the hole portion 31 is formed in the first peripheral wall portion 29 that is a peripheral wall portion along the direction in which the convex portion 11 and the groove portion 12 extend.
After the shaping step, the shaped sheet 71 is conveyed in the conveying direction MD in a state where the surface (second surface side) opposite to the protruding direction of the convex portion 11 is the upper surface side. .

After the shaping process, the coating process is performed. In this application step, the volatile agent 9 is applied by the application device 77 to the shaping sheet 71 that has left the shaping device 76 and is conveyed in the conveyance direction MD.
In this embodiment, the coating device 77 rotates the coater roll 77 a having the drug attached to the outer peripheral surface thereof, while rotating the coater roll 77 a on the second bottom 28 of the second recess 26 in the shaped sheet 71. The medicine 9 is transferred to the second surface of the second bottom portion 28 and applied by directly contacting the surface 2b (in this case, the upper surface). In addition, the code | symbol 77b in FIG. 7 is a support roll which supports the shaping sheet | seat 71 which contacts the coater roll 77a, and can perform transfer and application | coating of a chemical | medical agent stably.

At this time, the second recessed portion 26 of the shaped sheet 71 protrudes (in this case, protrudes upward) compared to the other portions, so that the coater roll 77a can be easily brought into contact with the second bottom portion 28. In addition, since the second bottom portion 28 has a higher fiber density and higher rigidity than the other portions, the coater roll 77a can be stably brought into contact with the second bottom portion 28, whereby the drug 9 is reliably and stably brought into contact with the second bottom portion 28. Can be applied.
Note that the medicine 9 applied to the second surface 2b of the second bottom portion 28 penetrates not only to the surface of the second surface 2b of the second bottom portion 28 but also to the inside thereof. However, since the fiber density of the second bottom portion 28 is higher than that of other portions, the drug 9 is the convex portion that is most easily in contact with the skin as the peripheral wall portion 27 and further as the top sheet from the second bottom portion 28 due to the influence of capillary action. 11, and easily stays at the second bottom portion 28.

When the coating process is completed, a top sheet continuous body 72 as shown in FIG. 11 is completed. This top sheet continuous body 72 is formed on the absorbent body 4 on the carrier sheet 65 to be laminated on the absorbent body 4. It is conveyed toward and is laminated and bonded to the surface on the upper surface side of the absorbent body 4 through the adhesive layer. At this time, in the top sheet continuous body 72, at least a part of the second surface 2 b of the first bottom 22 in the first recess 21 and the second surface 2 b of the second bottom 28 in the second recess 26 are the upper surfaces of the absorber 4. On the other hand, the second surface 2b of the convex portion 11 is hardly joined.
Then, each process mentioned above is implemented and the sanitary napkin 1 as a product is completed.

In the sanitary napkin 1 having the above-described configuration, the volatile drug 9 is applied to the second surface 2 b of the second bottom portion 28 of the second recess 26 of the top sheet 2. At this time, since the second bottom portion 28 has the highest fiber density in the top sheet 2, it is difficult for the drug 9 to move to other portions, in particular, the convex portion 11 that contacts the skin.
Further, the second bottom portion 28 to which the drug 9 is applied is farthest from the top portion 13 of the convex portion 11 that is most likely to touch the wearer's skin in the thickness direction of the sanitary napkin 1 in the top sheet 2. Furthermore, since it is further away from the first bottom portion 22 of the first concave portion 21 that easily comes into contact with the skin next to the convex portion 11, it is possible to prevent the drug 9 from directly touching the skin as much as possible. . In this respect, the drug 9 is particularly effective when it is likely to irritate the skin, such as a refreshing agent. In this case, the drug 9 applied to the second bottom portion 28 is directly applied to the skin. Even when the contact is not made, the irritation to the skin from the volatilized drug can be reduced.

Furthermore, as shown in FIG. 12A, for example, when the sanitary napkin 1 is individually wrapped, the wing portions 7 and 7 are folded inward in the width direction of the sanitary napkin 1, and the wing portion 7 In particular, the side sheet 6 comes into contact with the top sheet 2. However, as shown in FIG. 12B, even in this case, the side sheet 6 that is in contact with the top sheet 2 is separated from the second bottom portion 28 and is difficult to contact. Contact with the sheet 6 can be suppressed.
Therefore, when the sanitary napkin 1 is attached to the underwear, when the folded wing part 7 is pinched and opened by the finger, the drug 9 is prevented from being transferred to the finger skin through the side sheet 6, and when worn. Even if the side sheets 6 and 6 come into contact with the skin of the wearer's thigh or the like, the transfer of the drug 9 to the skin is suppressed, so that damage to the skin by the drug 9 can be suppressed.

In the said embodiment, although the 2nd bottom part 28 of the top sheet 2 was joined to the absorber 4, the fiber density is larger than the 2nd bottom part on the surface at the top sheet side in an absorber, and it was excellent in liquid diffusibility. In addition to providing a liquid-permeable second sheet, the second bottom portion of the top sheet may be joined to the second sheet.
In this case, since the medicine applied to the second bottom portion easily moves to the second sheet having a fiber density higher than that of the second bottom portion, the medicine is difficult to move toward the convex portion.
In addition, when the second sheet is provided, if the second sheet is selected so that the hydrophobicity of the second sheet is higher than that of the top sheet, the drug easily moves to the second sheet. Become.

In the above-described embodiment, the hole 31 is provided in the peripheral wall 27, but the hole is not necessarily provided. Moreover, when providing a hole part, you may provide in either the 1st surrounding wall part or the 2nd surrounding wall part of a surrounding wall part, and about the number of holes, the rigidity of a 2nd recessed part, especially the rigidity of a surrounding wall part is sufficient. It can be set arbitrarily as long as it can be secured.
Furthermore, in the said embodiment, although the height from the surface by the side of the top sheet of the absorber 4 to the 1st surface 2a of the top part 13 of the convex part 11 is made larger than the magnitude | size of the width direction of the groove part 12, This configuration is not necessarily required.

In the embodiment, the convex portion 11 has the largest distance at the top portion 13, that is, the thickness between the first surface 2 a and the second surface 2 b in the convex portion 11. However, the convex part does not necessarily have the maximum thickness of the top part.
Moreover, in the said embodiment, although the part by the side of the 2nd surface 2b in the top part 13 is not joined to the absorber 4, the convex part has ensured sufficient softness | flexibility as a convex part. In that case, the portion on the second surface side at the top may be joined to the absorber.
Furthermore, in the said embodiment, although at least one part of the 2nd surface 2b of the 1st bottom part 22 in the 1st recessed part 21 is joined to the absorber 4, about the 1st bottom part, it is not necessarily joined to the absorber. It does not have to be.

  In the said embodiment, although the pressing grooves 41-43 and the pressing part 44 are provided in the surface at the side of a top sheet, it is not necessary to necessarily provide about a pressing groove and a dot-shaped pressing part. Even if it is a case where such a pressing groove and a pressing part are provided, the number and shape can be set arbitrarily.

  Moreover, in the said embodiment, although the volatile chemical | medical agent 9 is the state applied to not only the 2nd surface 2b of the 2nd bottom part 28 but the 2nd bottom part 28, a chemical | medical agent is a 2nd bottom part. If it is applied to the second surface, it need not be applied to the entire second bottom.

Furthermore, although the said embodiment demonstrated the example of the sanitary napkin as an absorbent article, as absorbent articles, various absorbent articles, such as a disposable diaper and an incontinence pad (panty liner), may be sufficient.
Moreover, in the said embodiment, although the wing part 7 was provided in the sanitary napkin 1, even if an absorbent article is a sanitary napkin, this wing part does not necessarily need to be provided.

1 Sanitary napkin (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 9 Volatile medicine 11 Protruding part 12 Groove part 13 Top part 21 First recessed part 22 First bottom part 26 Second recessed part 27 Peripheral wall part 28 Second bottom part 29 First peripheral wall part 30 Second peripheral wall part 31 hole 41-43 pressing groove

Claims (6)

A top sheet having a length direction, a width direction, and a thickness direction, having a liquid permeability, a back sheet having a liquid impermeability, and an absorber disposed between the top sheet and the back sheet An absorbent article comprising
The top sheet has a first surface located on the opposite side of the absorber and a second surface on the absorber side, and extends in the length direction and at a predetermined interval in the width direction. A plurality of protrusions that protrude in the direction of the first surface and a direction of the second surface that extends in the length direction and is formed between the protrusions. Having a plurality of recessed grooves,
The groove includes a first recess having a first bottom located in a direction of the absorber with respect to a position on the first surface side at a top of the protrusion, and a recess in the length direction in the first recess. A plurality of second recesses formed continuously and formed in a recess shape opening in the first bottom,
The second recess has a peripheral wall portion extending from the first bottom portion in the direction of the absorber, and the top sheet provided to close the end portion of the peripheral wall portion on the absorber side. A second bottom portion having the highest fiber density among
Said second recess, with said volatile agent to the second surface of the second bottom portion is applied, and the second bottom is joined to the absorbent body,
The peripheral wall portion includes a hole portion that penetrates the peripheral wall portion from the first surface to the second surface.
Absorbent article. The height from the surface on the top sheet side of the absorber to the first surface of the top of the convex portion is larger than the size of the groove in the width direction,
The absorbent article according to claim 1 . The convex part has the largest distance between the first surface and the second surface in the convex part at the top.
The absorbent article according to claim 1 or 2 . The convex portion has a portion on the second surface side at the top that is not joined to the absorber.
The absorptive article according to any one of claims 1 to 3 . The top sheet is curved into a shape in which a region of the first surface and a region of the second surface of the convex portion are convex from the second surface toward the first surface, and the top portion of the groove portion The region of the first surface and the region of the second surface in the first recess have a configuration that is curved into a convex shape from the first surface toward the second surface.
The absorptive article according to any one of claims 1 to 4 . The absorbent article includes a pressing groove formed by pressing the top sheet and the absorber toward the thickness direction on the surface of the top sheet.
The absorbent article according to any one of claims 1-5.

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