JP6837307B2 - Absorbent article - Google Patents

Description

The present invention relates to a pad-type absorbent article, and more specifically, it can be applied as an inner of a diaper, a sanitary napkin, a urine leak pad, etc. Regarding pad-type absorbent articles.

Absorbent articles such as general disposable diapers and sanitary napkins include a liquid-permeable front sheet, a liquid-impermeable back sheet, and an absorber arranged between the front sheet and the back sheet. Is configured to include. As such an absorbent article, there is a pad-type disposable diaper in which an absorbent pad for assisting absorption of urine or the like is laid as an inner on the surface of the diaper used as an outer so that the entire diaper does not need to be replaced at the time of excretion. Various forms of the absorbent pad have been proposed. For example, the absorbent pad is expanded and contracted in parallel with the longitudinal direction of the product to change the size and absorption site according to the body shape and application, and the absorbent body is notched. , Those provided with a structure for separating the absorber, etc. have been proposed.

Patent Document 1 proposes an absorbent article in which the size and absorption site can be changed according to the body shape, use, and situation of the user without producing unnecessary parts, and the structure is simple. In this absorbent article, a main body portion formed by arranging a plurality of absorbing portions side by side so as to form an integral body, a perforation for separating adjacent absorbing portions from each other, and adjacent absorbing portions are connected to each other. It is a pad-type absorbent article provided with a connecting member that can extend in a direction in which adjacent absorbing portions are separated from each other.

Patent Document 2 proposes an absorption pad that can absorb excrement satisfactorily even if the size is given in advance, and can be separated into smaller sizes as needed. This absorbing pad includes a liquid-permeable first sheet and a second sheet, and two absorbers sandwiched between the two sheets, and the first sheet and the absorbent body are sandwiched between the absorbers. The second sheet is pulled out to the lower surface side, and the folds formed thereby are temporarily joined to the lower surface of the other portion of the second sheet. This temporary joining is released as needed, and the absorbent pad can be cut into smaller sizes for use.

Patent Document 3 proposes an auxiliary absorption pad capable of exerting the function of an absorber even for highly viscous excrement. This auxiliary absorption pad is a long auxiliary absorption pad placed on the absorption surface of the absorber, and is arranged on a surface sheet having liquid permeability and one surface side of the surface sheet, and has a plurality of water absorption pads. It is configured to include an absorber formed by laminating paper, and a plurality of sheets extending from one side portion in the width direction perpendicular to the longitudinal direction toward the other side portion in the width direction at intervals in the longitudinal direction. A notch is formed.

Japanese Unexamined Patent Publication No. 2012-175991 Japanese Unexamined Patent Publication No. 2011-56092 Japanese Unexamined Patent Publication No. 2012-55382

In the pad-type absorbent article described in Patent Document 1, each adjacent absorbing portion can be cut into pieces of an appropriate size by perforations, but the cut pieces need to be cleaned up and not discarded. There is a problem that the size and shape are limited even if it is reused. In the absorption pad described in Patent Document 2, the size of the absorption pad can be selected according to the situation, but since it is fixed at a predetermined size, it may be difficult to select a suitable size, and at the same time, it is excreted. Leaks may occur with respect to the amount of liquid. The auxiliary absorbing pad described in Patent Document 3 has a notch from one side portion in the width direction orthogonal to the longitudinal direction toward the other side portion, so that it is disposable when used in an overlapping manner with an absorbent such as a disposable disposable diaper. It flexibly deforms in the width direction as the disposable diaper bends, but the spread in the longitudinal direction is not flexible.

Further, in a general absorbent pad, three-dimensional gathers protruding toward the body extend in the front-rear direction on both sides of the surface of the main body including the absorber, but the outer paper diaper also has three-dimensional gathers. If it is present, the pad and the diaper's three-dimensional gathers are doubly present, which makes the wearing feeling worse and may cause leakage. In addition, for babies born with low weight, gauze or sanitary napkins may be used instead of diapers to avoid straining the body, but both have restrictions on the amount of absorption and shape.

The present invention has been made in consideration of the above-mentioned problems of the prior art, and an object thereof is applicable as an inner of a diaper, a sanitary napkin, a urine leak pad, etc. It is an object of the present invention to provide a pad-type absorbent article having high absorbency and good absorbency.

The absorbent article according to the present invention is sandwiched between a liquid-permeable front sheet, a liquid-impermeable back sheet, and the front sheet and the back sheet, and a plurality of absorbent articles intermittently arranged in the longitudinal direction. A pad-type absorbent article having a body, wherein the plurality of absorbers are each folded in the longitudinal direction, and both sides of the folded portion in the width direction orthogonal to the longitudinal direction. Is locked.

According to the present invention, of the portions in which the plurality of absorbers are folded in the longitudinal direction, both sides in the width direction orthogonal to the longitudinal direction are locked, so that the absorbers absorb body fluids and the like. At the same time as it swells and the middle part in the width direction expands in the longitudinal direction, both sides in the width direction stand up. As a result, the absorbency is improved and the structure can be deformed to prevent leakage. Therefore, according to this absorbent article, it is not necessary to provide double gathers as in the prior art, and the wearing feeling at the time of wearing is enhanced.

In the absorbent article according to the present invention, the folded portions are alternately mountain-folded and valley-folded in the longitudinal direction.

According to the present invention, since the folded portions are alternately mountain-folded and valley-folded in the longitudinal direction, folding can be performed by a simple process. Further, since there is no gather on both sides in the width direction orthogonal to the longitudinal direction, it is possible to obtain a flat pad type absorbent article, and it is possible to reduce deterioration of wearing feeling and occurrence of leakage.

In the absorbent article according to the present invention, the locked portion is the tip or substantially the tip of the mountain fold portion on the skin surface side.

According to the present invention, since the locked portion is the tip or substantially the tip of the mountain fold portion on the skin surface side, the folds on the skin surface side can be flattened, and the feeling of wearing on the skin can be enhanced. it can. Furthermore, the unevenness on both sides that rises after absorbing the body fluid can be reduced.

In the absorbent article according to the present invention, the plurality of absorbers arranged in the central portion are longer in the longitudinal direction than the absorbers arranged at both ends in the longitudinal direction.

According to the present invention, the central portion is near the crotch portion when worn, but since the absorber in the central portion is longer than the absorbers at both ends, the weight of the absorber in the central portion after absorbing the body fluid is increased. It becomes heavier and easier to expand in the longitudinal direction, and at the same time, the folds are easier to spread.

In the absorbent article according to the present invention, the folding direction is symmetrical toward the central portion in the longitudinal direction.

According to the present invention, since the folding direction is symmetrical toward the central portion in the longitudinal direction, the folds after absorbing the body fluid are likely to spread.

In the absorbent article according to the present invention, it is a diaper inner, a sanitary napkin, or an incontinence pad.

According to the present invention, it is possible to provide a pad-type absorbent article that can be applied as an inner of a diaper, a sanitary napkin, a urine leak pad, etc., enhances the feeling of wearing on the skin at the time of wearing, and has good absorbency. Can be done.

It is explanatory drawing which shows an example of the absorbent article which concerns on this invention. It is a perspective view of the absorbent article shown in FIG. FIG. 1 is a cross-sectional view taken along the line II of the absorbent article shown in FIG. FIG. 2 is a sectional view taken along line II-II of the absorbent article shown in FIG. 1 in the longitudinal direction. It is a perspective view which shows an example of the locking position. It is a perspective view which shows another example of the locking position. FIG. 3 is a sectional view taken along line III-III of the absorbent article shown in FIG. 1 in the longitudinal direction. It is sectional drawing in the longitudinal direction which shows an example of the absorbent article which changed the size of the absorber. It is sectional drawing in the longitudinal direction which shows an example of the absorbent article which changed the folding direction. This is an example of the form of an absorbent article after the absorber has absorbed a body fluid or the like.

An embodiment of the absorbent article according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments, and includes various modifications and applications having the main parts thereof.

[Absorbent article]
As shown in FIGS. 1 to 4, the absorbent article 1 according to the present invention is sandwiched between a liquid-permeable front sheet 12, a liquid-impermeable back sheet 13, and a front sheet 12 and a back sheet 13. , A pad-type absorbent article having a plurality of absorbers 11 intermittently arranged in the longitudinal direction Y. In the absorbent article 1, the plurality of absorbers 11 are each folded in the longitudinal direction Y, and both side portions 31 in the width direction X orthogonal to the longitudinal direction Y of the folded portions 10 are locked. Has been done.

In this absorbent article 1, among the portions where the plurality of horizontally elongated absorbers 11 are folded in the longitudinal direction Y, both side portions 31 and 31 in the width direction X orthogonal to the longitudinal direction Y are locked. Therefore, after absorbing the body fluid or the like, the absorber 11 swells and the intermediate portion 32 in the width direction X expands in the longitudinal direction Y, and at the same time, both side portions 31 in the width direction W stand up. As a result, the absorbency is improved and the structure can be deformed to prevent leakage. Therefore, according to the absorbent article 1, it is not necessary to provide double gathers as in the conventional case, and there is an effect that the wearing feeling at the time of wearing is enhanced. As the absorbent article 1, a diaper inner, a sanitary napkin, an incontinence pad (urine leakage pad) and the like can be preferably mentioned.

Hereinafter, the components and structural forms of the absorbent article will be described in detail.

<Components>
As shown in FIGS. 1 to 4, the basic structural form of the absorbent article 1 is that a plurality of absorbers 11 are sandwiched between the front surface sheet 12 and the back surface sheet 13, and the plurality of absorbers 11 are sandwiched between the front surface sheet 12 and the back surface sheet 13. 11 is intermittently arranged in the longitudinal direction Y, the plurality of absorbers 11 (the overlapping portion between the front surface sheet 12 and the back surface sheet 13) are each folded in the longitudinal direction Y, and the plurality of absorbers 11 are folded in the longitudinal direction Y. Of the folded portions 10, both side portions 31 in the width direction X orthogonal to the longitudinal direction Y are locked. The absorbent article 1 is not particularly limited except for these basic structural forms, and various modified forms may be used as described later.

(Absorber)
The absorber 11 has an absorbing performance of absorbing excrement, body fluid, etc. excreted by the user, and a plurality of absorbers 11 are used. As shown in FIGS. 1 and 2, the plurality of absorbers 11 are sandwiched between the front and back sheets 12 and the back surface sheet 13 in a manner in which a plurality of absorbers are arranged at regular intervals in the longitudinal direction Y. As will be described later, the front surface sheet 12 is a liquid-permeable sheet that covers the absorber 11 from the front side, and the back surface sheet 13 is a liquid-impermeable sheet that covers the absorber 11 from the back side. The "front surface" is a surface that becomes the skin surface side 2 when worn, and the "back surface" is a surface that becomes the non-skin surface side 3 when worn.

The structure of the absorber 11 is not particularly limited as long as it has the above-mentioned absorption performance, but usually, any absorber 11 can be used according to the commercial use of the absorbent article 1, and for example, an aggregate of fibers. A high-absorptive polymer or the like composed of the above can be preferably mentioned. Each of these materials may be composed individually, or a plurality of these materials may be mixed and composed. As this fiber aggregate, a non-woven fabric such as an air-laid non-woven fabric, an aggregate in which short fibers such as cotton pulp and synthetic fibers are stacked, and a tow (fiber bundle) of synthetic fibers such as cellulose acetate are opened as necessary. Examples thereof include filament aggregates obtained from the above.

As the highly absorbent polymer, those used for this kind of absorbent article can be used as they are. The particle size of the highly absorbent polymer particles is not particularly limited, but for example, sieving (shaking for 5 minutes) using a standard sieve (JIS Z8801-1: 2006) of 500 μm, and particles falling under the sieve by this sieving. When sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006), the proportion of particles remaining on the 500 μm standard sieve is 30% by mass or less, and the 180 μm standard sieve. It is desirable that the proportion of particles remaining on the top is 60% by mass or more.

The material of the highly absorbent polymer particles can be used without particular limitation, but those having a water absorption of 40 g / g or more are preferable. Highly absorbent polymer particles include starch-based, cellulosic-based and synthetic polymer-based ones, which are starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and crosslinked sodium carboxymethyl celluloses. A product, an acrylic acid (salt) polymer, or the like can be used. As the shape of the highly absorbent polymer particles, a commonly used powder or granular material is preferable, but other shapes can also be used. When highly absorbent polymer particles are used, if necessary, the spraying density or the amount of spraying may be adjusted in the plane direction of the absorber 11 and included in the absorber 11.

As the highly absorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption rate is too slow, so-called reversion, in which the liquid supplied into the absorber 11 returns to the outside of the absorber 10, is likely to occur.

Further, as the highly absorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the bulky absorber 11 is used, the sticky feeling after absorbing the liquid can be effectively suppressed.

The shape of the absorber 11 is a rectangle or a substantially rectangular shape (also referred to as a strip shape). The rectangular or substantially rectangular absorber 11 is advantageous for aligning in the longitudinal direction, and is also advantageous for aligning at regular intervals. The size of the absorbent body 11 can be arbitrary depending on the type and size of the absorbent article 1 such as the inner diaper, the sanitary napkin, and the urine leak pad.

(Surface sheet)
As shown in FIGS. 3A and 3B, the front surface sheet 12 is arranged on the skin surface side 2 (also referred to as the front surface side) of the absorber 11, and is arranged together with the back surface sheet 13 on the non-skin surface side 3. It is an indispensable sheet that sandwiches and wraps 11 from the front and back. The surface sheet 12 may be a liquid-permeable sheet having a property of permeating body fluid or the like. For example, a perforated or non-perforated non-woven fabric, a porous plastic sheet or the like is used, and excrement, body fluid or the like excreted. Acts to permeate and easily reach the absorber 11. The non-woven fabric may be produced by any processing.

The material of the surface sheet 12 is not particularly limited, and is olefin-based such as polyethylene and polypropylene, synthetic fiber such as polyester-based and polyamide-based, recycled fiber such as rayon and cupra, natural fiber such as cotton, and two or more of these. Examples thereof include mixed fibers and composite fibers made of. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the span lace method is preferable, and if bulkiness and softness are required, the thermal bond method is preferable. The surface sheet 12 may be made of one sheet, or may be a laminated sheet obtained by laminating two or more sheets. Also in the plane direction, the surface sheet 33 may be composed of one sheet or two or more sheets. Further, when the absorber 11 contains the highly absorbent polymer particles, it is desirable that the sheet is such that the highly absorbent polymer particles do not come out.

(Back sheet)
As shown in FIGS. 3A and 3B, the back surface sheet 13 is arranged on the non-skin surface side (also referred to as the back surface side) of the absorber 11, and is arranged together with the front surface sheet 12 on the skin surface side 2 of the absorber 11. It is an indispensable sheet to wrap it by sandwiching it from the front and back. The back surface sheet 13 is a liquid-impermeable sheet having a property of not permeating body fluids and the like.

The material of the back sheet 13 is not particularly limited, but for example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated non-woven fabric having a plastic film such as a polyethylene sheet on the surface of the non-woven fabric, or a waterproof film is interposed. Examples thereof include a non-woven fabric that substantially ensures liquid impermeability (in this case, the waterproof film and the non-woven fabric form a liquid-impermeable sheet). In addition to this, it is preferable to use a liquid-impermeable and moisture-permeable material for the liquid-impermeable back sheet 13 from the viewpoint of preventing stuffiness. The sheet of this liquid-impermeable and moisture-permeable material is obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet and then stretching it in a uniaxial or biaxial direction. Microporous sheets are widely used. In addition to this, a non-woven fabric using microdenyl fibers, a leak-proof reinforced sheet in which the voids of the fibers are reduced by applying heat or pressure, a highly water-absorbent resin or a hydrophobic resin or a water-repellent agent is applied. , A liquid-impermeable sheet or the like without using a waterproof film may be used as the liquid-impermeable back sheet 13.

The back surface sheet 13 may be colored or may have a pattern printed on it, if necessary, for the purpose of making it easy to understand that it is the back surface. Further, a bonding tape or an adhesive may be provided as needed for reasons such as attaching to the outer.

(Packaging sheet)
The packaging sheet 13 is a sheet for wrapping the absorbent body 11, and is arbitrarily provided according to the commercial use of the absorbent article 1 as shown in FIG. 3 (B). When the packaging sheet 13 is used, as the material thereof, tissue paper, crepe paper, non-woven fabric, non-woven fabric of polylami, a sheet having small holes and the like can be used. When the absorber 11 contains the highly absorbent polymer particles, it is desirable that the sheet is such that the highly absorbent polymer particles do not come out. Crepe paper is particularly preferably used, but when a non-woven fabric is used instead of the crepe paper, a hydrophilic SMS non-woven fabric (SMS, SMSMS, etc.) is particularly preferable, and the material thereof is polypropylene, polyethylene / polypropylene composite material, or the like. Can be done. The basis weight of the packaging sheet 13 is not particularly limited, but 5 to 40 g / m ² , particularly 10 to 30 g / m ² , is desirable.

The packaging form of the packaging sheet 13 is not particularly limited, and can be arbitrarily determined according to the commercial use of the absorbent article 1. For example, as shown in FIG. 3B, the absorber 11 may be entirely wrapped. Further, it may be in a form of covering only the back surface (the surface on the back surface sheet 13; the same applies hereinafter) and the side surface of the absorber 11. Further, only the upper surface (the side surface of the front surface sheet 12) and the side surface of the absorber 11 are covered with crepe paper or a non-woven fabric which is the packaging sheet 13, and the back surface (the surface on the back surface sheet 13 side; the same applies hereinafter) is made of polyethylene or the like. It may be covered with a back sheet 12. Further, only the upper surface of the absorber 11 may be covered with the crepe paper or the non-woven fabric which is the packaging sheet 13, and the side surface and the back surface may be covered with the back surface sheet 12 such as polyethylene. Furthermore, it may be in a form other than these.

When the absorber 11 contains high polymer particles, the packaging sheet 13 surrounds the front and back surfaces and both side surfaces of the absorber 11 from the viewpoint of preventing the movement of the particles and preventing the particles from falling off from the front and rear edge edges. It is preferable to use a packaging form in which the particles are wound in a tubular shape, the front and rear edges thereof are squeezed out from the front and back of the absorber 11, and the squeezed out portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

In addition to the packaging sheet 13, for example, a sheet that rapidly transfers the body fluid or the like that has passed through the surface sheet 12 to the absorber 11 can be mentioned as an example that is optionally provided. This sheet preferably has a faster liquid permeation rate than the surface sheet 12, prevents the "backtracking phenomenon" of the absorbed body fluid or the like from the absorber 11, and keeps the surface sheet 13 in a dry state at all times. be able to. Examples of this sheet include the same material as the surface sheet 12, spunlace, spunbond, SMS, pulp non-woven fabric, mixed sheet of pulp and rayon, point bond or crepe paper. In particular, the air-through non-woven fabric is preferable because it is bulky. This sheet may be arranged in the center with a width shorter than the width of the absorber 11, or may be provided over the entire width. Further, the length of the sheet in the longitudinal direction may be the same as the length of the absorber 11, or may be a short length centered on the region for receiving the body fluid or the like.

<Structural form>
(Folded structure)
As shown in FIGS. 1 to 4, the absorbent article 1 is provided with a plurality of absorbers 11 sandwiched between the front surface sheet 12 and the back surface sheet 13, and the plurality of absorbers 11 are longitudinally provided. It is arranged intermittently in the direction Y. The plurality of absorbers are each folded in the longitudinal direction Y, and both side portions 31 in the width direction W orthogonal to the longitudinal direction Y of the folded portions 10 are locked. When the folded portion 10 absorbs body fluid or the like, as shown in FIG. 10, the absorber 11 expands and the intermediate portion 32 in the width direction W expands in the longitudinal direction Y, and at the same time, both side portions 31 in the width direction W. Works to stand up. At this time, the tips 34 of both side portions 31 face upward, and have the same effect as gathering.

The folded portion 10 is alternately mountain-folded R and valley-folded V in the longitudinal direction Y. In the folded portion 10, all or most of the area of the absorber 11 appears on the surface sheet 12 side on the mountain fold R side, and the folded portion 10 is folded without being covered with the crease. As a result, the absorber 11 easily absorbs body fluids and the like. On the other hand, on the back sheet 13 side on the valley fold V side, a part of the absorber 11 is folded in a manner covered by the creases in the valley. An example of the length covered by the crease of the valley is, for example, about 4 mm to 8 mm.

Such a folded portion 10 can be folded in a simple process, which is advantageous in reducing the manufacturing cost. Further, since there is no gather on both side portions 31 of the width direction X orthogonal to the longitudinal direction Y, it is possible to make a flat pad type absorbent article, and it is possible to reduce deterioration of wearing feeling and occurrence of leakage. Can be done. Further, the presence of such a folded portion 10 is necessary for the formation of the following locking portion 30, and the folded portion 10 is allowed to exist on the back side of the absorber 11 to absorb the absorber 11. In addition to being able to fully exhibit its performance, it can be locked at both side portions 31 in the width direction X, and as a result, the absorber 11 swells and the intermediate portion 32 in the width direction W expands in the longitudinal direction Y at the same time. , Both side portions 31 in the width direction W stand up.

(Locking)
In the absorbent article 1, as shown in FIGS. 1 and 7 (III-III cross-sectional view), both side portions 31 of the folded portion 10 in the width direction W orthogonal to the longitudinal direction Y are locked. .. The locking means is related to the material of the front surface sheet 12 and the back surface sheet 13, and examples thereof include ultrasonic bonding and heat fusion (heat sealing).

After absorbing body fluids and the like, the absorber 11 tends to swell downward due to swelling and its own weight. At this time, since the absorbent article 1 has the folded portion 10, the intermediate portion C in the width direction X of the absorbent article 1 expands downward while expanding in the longitudinal direction Y. On the other hand, since both side portions 31 in the width direction X of the absorbent article 1 are locked and the folded portion 10 is restrained, as shown in FIG. 10, there is no dimensional change in both side portions 31, and both side portions. The tip 34 of 31 faces upward and rises in a fold shape. As a result, both side portions 31 of the absorbent article 1 in the width direction X are deformed into a raised structure capable of preventing leakage, as shown in FIG. Therefore, the absorbent article 1 having such a structural form does not need to be provided with three-dimensional gathers, and the wearing feeling at the time of wearing is enhanced.

As shown in FIGS. 5 to 7, the locking portion 30 is preferably the top tip 33 or substantially the tip of the mountain fold portion R on the skin surface side in the folded portion 10. By doing so, the folds of the mountain fold portion R on the skin surface side 2 do not pop out and become flat, and the feeling of wearing on the skin can be enhanced.

As shown in FIG. 5, the position of the locking portion 30 in the width direction X is preferably a position separated from the end portion 35 of the absorber 11 in the width direction X by a distance d. By providing the locking portion 30 at a position away from the end portion 35, the absorbent article 1 can expand downward while spreading in the longitudinal direction Y, and both side portions 31 can stand up in a fold shape. The distance d at this time is preferably, for example, 3 mm or more.

More preferably, as shown in FIG. 6, the position of the locking portion 30 is preferably provided at the tips (both ends) 34 of both side portions 31 in the width direction X of the absorbent article 1. Since the locking portion 30 is provided at the tip 34, both side portions 31 can easily rise in a pleated shape. In particular, it is preferable that the top tip 33 of the mountain fold portion R is provided with 30 g of locking portions at the tips (both ends) 34 of both side portions 31.

FIG. 8 is a sectional view in the longitudinal direction showing an example of the absorbent article 1 in which the size of the absorber 11 is changed. In the folded portion 10, the absorbers 11 arranged at the central portion 36 of the absorbent article 1 in the longitudinal direction Y are more than the absorbers 11'arranged at both ends of the absorbent article 1 in the longitudinal direction Y. Can be configured to be longer in the longitudinal direction Y. In such a structural form, the central portion 36 is near the crotch portion when worn, but since the absorber 11 at the central portion 36 is longer than the absorbers 11'at both ends, the central portion 36 after absorbing the body fluid. The absorber 11 becomes heavier and lowers by its own weight to facilitate expansion in the longitudinal direction, and at the same time, the folds tend to spread. In FIG. 8, reference numeral L1 is the length of the absorber 11 arranged at the central portion 36 of the absorbent article 1 in the longitudinal direction Y, and reference numeral L3 is arranged at both ends of the absorbent article 1 in the longitudinal direction Y. It is the length of the absorber 11', and the symbol L2 is the length of the absorber 11 located between the two.

FIG. 9 is a cross-sectional view in the longitudinal direction showing an example of the absorbent article 1 in which the folding direction is changed. In the folded portion 10, the folding direction of the folded portion 10 formed by the mountain fold R and the valley fold V is configured to be symmetrical toward the central portion 36 in the longitudinal direction Y. May be good. In such a structural form, the central portion 36 is near the crotch portion at the time of mounting, but the folding direction of the folded portion 10 formed by the mountain fold R and the valley fold V is in the longitudinal direction Y toward the central portion 36. Since it is symmetrical, it becomes easier for the absorber 11 in the central portion 36 after absorbing the body fluid to be lowered by its own weight and expanded in the longitudinal direction.

(Shape of absorbent article, etc.)
As shown in FIG. 1 and the like, the absorbent article 1 is configured such that the peripheral edges of the front surface sheet 12 and the back surface sheet 13 protrude larger than the width of the peripheral edge of the absorber 11. This protruding portion is crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

The distance between the adjacent absorbers 11 is arranged within a range of, for example, 5 mm to 25 mm including the folded portion 10 to be folded back, and the arranged absorbers 11 are sandwiched between the front surface sheet 12 and the back surface sheet 13. Within this range, subsequent overlapping folds are possible, and the folded portion 10 of the mountain fold R and the valley fold V can be easily formed. If the distance is less than 5 mm, the folded portion 10 may not be formed, and if the distance exceeds 25 mm, the folded portion 10 may be too large and thick. The length D of the folded portion 10 is preferably in the range of, for example, 5 mm to 7.5 mm.

It is desirable that the folded portion 10 is folded so as to be orthogonal to the longitudinal direction Y of the absorbent article 1.

The size of the absorbent article 1 is not particularly limited because it is arbitrarily designed according to its commercial use and the size of S, M, L and the like. Therefore, the sizes of the absorber 11 in the longitudinal direction Y and the width direction X are also designed based on the size of the absorbent article 1.

In the absorbent article 1 according to the present invention, the absorber 11 is sandwiched between the front surface sheet 12 and the back surface sheet 13, and the length of the absorber 11 in the width direction X orthogonal to the longitudinal direction Y of the absorbent article 1. Is the length obtained by subtracting the length of both side portions 31 (the bonded portion of only the front surface sheet 12 and the back surface sheet 13) in which the absorber 11 does not exist. The length of both side portions 31 may be such that the length W per one side is, for example, about 10 to 30 mm, and any portion of the length becomes the locking portion 30. The length between the absorbers in the longitudinal direction Y of the absorbent article 1 may be a length that can be folded after the absorbers 11 are intermittently arranged in the longitudinal direction Y, for example, about 5 mm to 25 mm. It should be.

Therefore, the size of the front surface sheet 12 and the back surface sheet 13 may be such that the above-mentioned length W can be secured at both side portions 31 and the length between the above-mentioned absorbers can be secured between the plurality of absorbers. The size of the absorber 11 can be any size as long as their length can be secured.

(Product use)
The absorbent article 1 according to the present invention can be used for all pad-type absorbent articles that are preferably applicable as inner diapers, sanitary napkins, urine leak pads, and the like. These pad-type absorbent articles 1 may optionally include components applicable to conventional inners, sanitary napkins, urine leak pads, and the like.

<Explanation of terms in the specification>
When the following terms are used in the specification, they have the following meanings unless otherwise specified in the specification.
-"Gel strength" is measured as follows. Add 1.0 g of highly absorbent polymer to 49.0 g of artificial urine and stir with a stirrer. The produced gel was left in a constant temperature and humidity chamber at 60% RH at 40 ° C. for 3 hours, then returned to room temperature, and the gel strength was measured with a card meter (Curdmeter-MAX ME-500 manufactured by I.techno Engineering). To do.
・ "Metsuke" is measured as follows. After the sample or test piece is pre-dried, it is left in a test room or device in a standard state (the test place is a temperature of 20 ± 5 ° C. and a relative humidity of 65% or less) to bring it into a constant weight state. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. It is not necessary to pre-dry the fibers having an official moisture content of 0.0%. A sample having a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight state using a paper density plate (200 mm × 250 mm, ± 2 mm). The mass of the sample is measured and multiplied by 20 to calculate the weight per square meter, which is used as the basis weight.
-The water absorption rate shall be the "time to the end point" when JIS K7224-1996 "Water absorption rate test method for highly water-absorbent resin" was performed using 2 g of highly absorbent polymer and 50 g of physiological saline. ..
-If there is no description about the environmental conditions in the test or measurement, the test or measurement shall be performed in a test room or equipment under standard conditions (test location: temperature 20 ± 5 ° C, relative humidity 65% or less). ..
-Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.

1 Absorbent article 2 Skin side 3 Non-skin side 10 Folded part 11 Absorbent 11'Absorptives placed at both ends in the longitudinal direction 12 Front sheet 13 Back sheet 14 Packaging sheet 30 Locking part 31 Width Both sides in the direction 32 Middle part in the width direction 33 Top tip of the mountain fold part 34 Tip of both sides 35 End of the absorber 36 Central part in the longitudinal direction of the absorbent article R Mountain fold part V Valley fold part X Width direction Y Longitudinal direction W Length of one side in the width direction of the bonded portion of only the front surface sheet and the back surface sheet L Length of the absorber in the longitudinal direction of the absorbent article d From the end of the absorber in the width direction to the locking portion Distance D Length of folded part

Claims (5)

Pad-type absorbency having a liquid-permeable front sheet, a liquid-impermeable back sheet, and a plurality of absorbers sandwiched between the front sheet and the back sheet and arranged intermittently in the longitudinal direction. It ’s an article,
Wherein a between a plurality of absorber overlap between the topsheet and the backsheet, longitudinally are alternately mountain fold and valley fold is folded over the longitudinal direction, of the folded portion An absorbent article characterized in that both side portions in the width direction orthogonal to the longitudinal direction are locked. The engagement sealed with that portion, a tip or substantially tip of the mountain-folded portion of the skin face side, the absorbent article according to claim 1. The absorbent article according to claim 1 or 2 , wherein the plurality of absorbers are longer in the central direction than the absorbers arranged at both ends in the longitudinal direction. The absorbent article according to any one of claims 1 to 3 , wherein the folding direction is symmetrical toward the central portion in the longitudinal direction. The absorbent article according to any one of claims 1 to 4 , which is an inner diaper, a sanitary napkin, or an incontinence pad.

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