JP3962752B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper including a top sheet, a back sheet, and an absorbent body, and a skin contact sheet disposed on the top sheet.

  In recent years, as a diaper for infants or elderly people / handicapped persons, an absorbent body, a top sheet that is arranged so as to cover the upper surface of the absorbent body, and at least partially made of a liquid-permeable material, and a lower surface of the absorbent body Disposable diapers that are arranged so as to cover the back and are provided with a back sheet made of a liquid-impermeable material are widely used. By using the disposable diaper so that the surface of the top sheet is in contact with the skin of the wearer, the urine excreted by the wearer passes through the top sheet and is absorbed and held by the absorber. In addition, the back sheet excellent in leakage prevention prevents the excrement from leaking to the outside of the diaper.

  However, in the disposable diaper having the above-described configuration, although urine passes through the top sheet, most of the stool does not pass through the top sheet and remains on the top sheet. Since the stool remaining on the top sheet adheres to the wearer's crotch and buttocks, it requires cumbersome wiping work, which increases the burden of childcare and care, and also causes skin troubles for the wearer. It was. Such a problem becomes more apparent when the stool excreted by the wearer is soft stool.

  Therefore, a disposable diaper has been proposed in which another sheet body (hereinafter referred to as “skin contact sheet”) is arranged on the top of the top sheet (see, for example, Patent Documents 1 and 2). ). In these disposable diapers, an opening (stool passing opening) through which stool can pass is formed in the skin contact sheet, and the feces excreted by the wearer through the stool passing opening are on the top sheet. Configured to fall into.

Utility Model Registration No. 2559050 (paragraph 0010, FIG. 2) JP 2002-11044 A (paragraph 0020, FIG. 1)

  In the disposable diaper as described above, since the skin contact sheet first comes into contact with the skin of the wearer, the top sheet disposed at the lower part of the skin contact sheet is difficult to directly contact the wearer's skin. That is, the wearer's skin and the top sheet are separated from each other. In addition, a shielding layer called a skin contact sheet is interposed between the top sheet and the wearer's skin. Therefore, even if stool remains on the top sheet, it is possible to expect the effect of greatly reducing the chance that the stool and the skin of the wearer are in direct contact.

  The skin contact sheet in which the opening is formed, particularly a disposable diaper provided with a skin contact sheet in which two openings (a stool passage opening and a urine passage opening) are formed, is the skin contact sheet of the wearer. The closer to the body, the easier it is for stool and urine to pass through the opening, and the effect of reducing the chance of contact between the stool and the wearer's skin is more likely to be exhibited. However, the better the adhesion between the skin contact sheet and the wearer's body, the more likely the skin contact sheet and the wearer's skin will become stuffy due to sweat, etc. The conventional disposable diapers are not fully satisfactory and still have problems to be solved.

  Thus, at present, the excreted stool is less likely to come into direct contact with the skin of the wearer, and the portion (skin) where the skin contact sheet comes into contact with the wearer may cause skin trouble. Disposable diapers that can be effectively suppressed are not disclosed, and such disposable diapers are eagerly desired. The present invention has been made in order to solve the above-described problems of the prior art, and is a disposable diaper in which excreted stool is less likely to come into direct contact with the skin of the wearer and skin trouble can be effectively prevented. Is to provide.

  The following disposable diapers are provided by the present invention.

[1] An absorber, disposed so as to cover the upper surface of the absorber, a top sheet made of at least a part of a liquid-permeable material, and disposed so as to cover the lower surface of the absorber, and impermeable to liquid A disposable diaper comprising a front body, a crotch part, and a back body, further comprising a skin contact sheet (SCS) disposed on an upper part of the top sheet, the skin contact The seat has a stool passage opening and a urine passage opening through which stool can pass at a portion corresponding to the crotch portion, and extends in the width direction sandwiched between the two openings. A region (SCS central region) obtained by extending a belt-like region (inter-opening region) back and forth by half the length between the openings, an SCS ventral region located on the ventral side of the SCS central region, and It is comprised from the SCS back side area | region located in the back | dorsal side, and the said SCS center area | region of the said skin contact sheet has the expansion-contraction force of the width direction, The longitudinal direction outer side of each of the said two opening parts of the said skin contact sheet The disposable diaper whose area | region (opening part outer side area | region) located in is an area | region which does not have the expansion-contraction force of the width direction and a longitudinal direction.

[2] The disposable diaper according to [1], wherein both side edge regions (SCS side edge regions) of the skin contact sheet are regions having no stretching force in the width direction and the longitudinal direction.

[3] The disposable diaper according to [2], wherein a width of one side of the SCS side edge region is 2.5 to 25% of a width of the entire skin contact sheet.

[4] A stretchable elastic material (opening stretchable material) is disposed so as to extend in the longitudinal direction in the SCS ventral region and the SCS dorsal region along the opening in the SCS central region of the skin contact sheet, The disposable diaper according to any one of [1] to [3], wherein the opening stretchable material is not disposed in the opening outer region.

[5] The disposable diaper according to any one of [1] to [4], wherein the skin contact sheet is formed of a breathable sheet.

  The disposable diaper of the present invention is effective in that the excreted stool is less likely to come into direct contact with the wearer's skin, and that the skin contact sheet contact portion (skin) causes skin trouble when the wearer wears it. Can be suppressed. In other words, the disposable diaper of the present invention avoids the problem of skin trouble when a skin contact sheet having two openings is installed, and is excellent in that the effect of forming two openings can be reliably exhibited. It is effective.

  Hereinafter, the best mode for carrying out the disposable diaper of the present invention will be specifically described by taking a two-piece type pant diaper as an example. However, the present invention broadly encompasses disposable diapers having the invention specific items, and is not limited to the following embodiments. In addition, about FIG. 3, for the convenience of drawing, it drawn in the form which left the leg elastic material from drawing.

  In addition, in this specification, when calling it "pants type diaper", like the disposable diaper 1 shown in FIGS. 1-3, the side edge parts (side edge part 2a, 6a) of the front body 2 and the back body 6 correspond. , Side edges 2b and 6b) are joined to form a joint 8, a waist opening 10 and a pair of leg openings 12a and 12b. Shall. And the “two-piece type” means an absorbent main body 14 that functions to absorb and retain the excrement of the wearer (absorption / holding function) and a function (wearing function) that encapsulates the wearer's body. It shall consist of the exterior member 16 to bear, and shall mean the diaper of the type by which the absorptive main body 14 was arrange | positioned inside the exterior member 16. FIG. As shown in FIG. 3, the absorbent main body 14 is a member that includes an absorbent body 22, a top sheet 18, and a back sheet 20 as constituent elements.

  In addition, in this specification, “front body” means a part that covers the abdomen (front of the body) of the wearer when a diaper is worn on the wearer, and “inseam” means that the wearer wears a diaper. When the wearer wears a diaper, the part covering the inseam of the wearer means the part covering the back side (back of the body) of the wearer.

[1] Configuration of the disposable diaper of the present invention:
The disposable diaper of this invention is arrange | positioned so that the upper surface of the absorber 22 and the absorber 22 may be coat | covered like the disposable diaper 1 shown in FIGS. 1-3, The top which at least one part consists of a liquid-permeable material A disposable diaper that includes a front body 2, a crotch part 4, and a rear body 6 and includes a sheet 18 and a back sheet 20 that is disposed so as to cover the lower surface of the absorber 22 and is made of a liquid-impermeable material. The skin contact sheet (SCS) 24 is further provided on the top sheet 18. The skin contact sheet 24 is formed with two openings 26 (a urine passage opening 26a and a stool passage opening 26b) arranged in the longitudinal direction in a portion corresponding to the crotch portion 4. Further, as shown in FIG. 4, the skin contact sheet 24 includes a band-like region (inter-opening region) 29 extending in the width direction sandwiched between two openings, and a length between the open portions (inter-opening region 29). (Longitudinal direction length) 29a (a SCS central region) 30 extended back and forth by a half length, an SCS ventral region 32 located on the ventral side of the SCS central region 30, and an SCS dorsal region located on the dorsal side 34, at least the SCS central region 30 has a stretching force in the width direction, and is a region (outside of the opening) located on the outer side in the longitudinal direction of each of the two openings 26 (26a, 26b) of the skin contact sheet 24. (Region) 51 (51a, 51b) is a region having no stretching force in the width direction and the longitudinal direction. The region located on the outer side in the longitudinal direction of the urine passage opening 26a is the opening outer region 51a, and the region located on the outer side in the longitudinal direction of the stool passage opening 26b is the opening outer region 51b. The SCS central region 30 may have a longitudinal stretching force, and the SCS ventral region 32 and / or the SCS dorsal region may have a lateral stretching force or a longitudinal stretching force. May be. Here, the region extending between the openings 29 in the front-rear direction means that the length in the width direction of the region 29 between the openings is fixed, and the front body direction (front side direction of the diaper) and the back body direction (front side direction of the diaper). ) And a region formed by extending the length in the longitudinal direction by a predetermined length. The urine passage opening 26a is an opening located on the abdomen of the wearer when the diaper is worn on the wearer among the two openings 26, and the stool passage opening 26b is It is an opening part located in a wearer's back side. The longitudinal direction is the front-rear direction when the disposable diaper is attached to the wearer, and the width direction is the left-right direction when the disposable diaper is attached to the wearer. And when it says a width, it means the length in the said width direction.

  Thus, since both the opening part outer side area | region 51 (51a, 51b) is an area | region which does not have the stretching force of the width direction and a longitudinal direction of the skin contact sheet 24, in the area | region which does not have a stretching force, it is a skin contact. The sheet does not adhere to the skin of the wearer, it is possible to improve air permeability, and skin trouble can be suppressed. And since the SCS center area | region 30 has at least the expansion-contraction force of the width direction, the disposable diaper 1 of this Embodiment has two opening parts 26 (urine of the skin contact sheet 24 when the disposable diaper 1 is mounted | worn with a wearer. The periphery of the passage opening 26a and the stool passage opening 26b) is in close contact with the wearer, facilitating passage of stool and urine through the opening 26, and facilitating contact between the stool and urine and the wearer's skin. Become. Here, the term “stretching force” refers to a value (g / cm) obtained by dividing a force necessary for stretching when a skin contact sheet having a certain width is stretched in a direction perpendicular to the width by the width. . Here, the “certain width” may be the width in the width direction or the width in the longitudinal direction of the skin contact sheet. Accordingly, when the “certain width” is the width in the skin contact sheet width direction, the extending direction is the skin contact sheet longitudinal direction, and when the “certain width” is the skin contact sheet longitudinal direction, The extending direction is the skin contact sheet width direction. The length of the “certain width” is not particularly limited. If the region to be measured and the extending direction are specified, the length in the direction perpendicular to the extending direction in the region is obtained. “Skin contact sheet is fully extended” means that the skin contact sheet is stretched and then returned to the original shape (length) of the sheet material (non-woven fabric, etc.). Say. Therefore, a state where the sheet material is further extended so as to be larger than the original shape is not included. The stretching force is measured by a tensile tester, and the strength of the stretched skin contact sheet is measured. As the tensile tester, Toyo Seiki Seisakusho Co., Ltd., trade name: Strograph, or Orientec Co., Ltd., trade name: Tensilon can be used. And it is set as the strength before the sheet is stretched and the strength of the nonwoven fabric appears. When measuring the stretching force, a region to be measured is cut out to be a measurement sample, and stretched in a direction perpendicular to the “certain width” to measure the stretching force.

  For example, when measuring the stretching force of each of the SCS central region 30 and the opening outer region 51, the region to be measured is cut out from the skin contact sheet 24 and used as a measurement sample. And when measuring the stretching force in the width direction, the stretching force is measured by grasping both ends in the width direction (direction corresponding to the width direction of the skin contact sheet) and extending in the width direction. When measuring the stretching force in the longitudinal direction, the stretching force is measured by grasping both ends in the longitudinal direction (the direction corresponding to the longitudinal direction of the skin contact sheet) and extending in the longitudinal direction.

[1-1] Skin contact sheet:
The skin contact sheet is a member for separating the wearer's skin and the top sheet, and is disposed on the top of the top sheet. By providing this skin contact sheet, the skin contact sheet first comes into contact with the skin of the wearer, and therefore the top sheet disposed at the lower part of the skin contact sheet is difficult to directly contact the wearer's skin. That is, the wearer's skin and the top sheet are separated from each other. In addition, a shielding layer called a skin contact sheet is interposed between the top sheet and the wearer's skin. Therefore, even if the stool remains on the top sheet, it is possible to greatly reduce the chance that the stool and the skin of the wearer are in direct contact.

As a material constituting the skin contact sheet, for example, a nonwoven fabric made of a resin such as polyethylene, polypropylene, or polyester, a mesh sheet, or a film can be used. Especially, it is preferable to use a nonwoven fabric in the point that the touch is favorable. These materials may be liquid permeable, liquid impermeable, or water repellent. However, a water repellent material (such as a water repellent nonwoven fabric) is preferable in that it can maintain a light touch (dryness) even when worn for a long time. The skin contact sheet is preferably a breathable sheet. Thereby, it is possible to further suppress the portion (skin) that the skin contact sheet contacts from being steamed and to prevent the occurrence of skin trouble. Here, the breathability of the breathable sheet is to allow moisture that evaporates from the body to escape to the outside and not steam in the diaper. "Can be expressed by the moisture permeability measured. The breathable, moisture permeability is preferably in the range of ^{2000~10000 (g / m 2 / 24hr} ).

  Since the skin contact sheet 24 allows the urine and feces excreted by the wearer to pass therethrough, two openings 26 (a urine passage opening 26a and a stool passage opening 26b) are formed as shown in FIG. Yes. By adopting such a structure, the urine excreted by the wearer passes through the urine passage opening 26a, the stool passes through the stool passage opening 26b, and falls onto the top sheet, respectively. Opportunities for direct contact between urine and feces and the skin of the wearer can be greatly reduced.

  The shape of the opening 26 is not particularly limited as long as the opening 26 has a shape that can pass feces. That is, the "opening" through which stool can pass is crossed with a cross-shaped slit, three or more slits in addition to a so-called opening (hole) such as a circular opening, an elliptical opening, or a diamond opening. A slit such as a star-shaped slit is also included, and a combination of a hole and a slit may be used. Among these, an elliptical opening or a star-shaped slit whose longitudinal direction is the longitudinal direction (longitudinal direction) of the diaper is preferable. The oval opening has the advantage that the stool is easy to pass through the opening of the skin contact sheet, and the star-shaped slit has the stool once passing through the opening of the skin contact sheet and falling on the top sheet. There is an advantage that it is possible to effectively prevent the skin contact sheet from being exposed again and contaminating the wearer's buttocks. For example, the disposable diaper 1 shown in FIG. 2 includes a urine passage opening 26a and a stool passage opening 26b in the portion corresponding to the crotch part 4 of the skin contact sheet 24, and the longitudinal direction of the diaper is the major axis direction. Is an example in which an elliptical opening is formed. Both the urine passage opening 26 a and the stool passage opening 26 b are preferably located at the center in the width direction of the skin contact sheet 24. The urine passage opening 26a and the stool passage opening 26b are arranged in the longitudinal direction of each skin contact sheet 24, such that the urine passage opening 26a can pass urine, the stool passage opening. The position is not particularly limited as long as 26b can pass the stool. The size of the urine passage opening 26a is not particularly limited as long as it can pass urine, and the size of the stool passage opening 26b is not particularly limited as long as it can pass stool. . For example, in the case of an L size for infants (longitudinal length of about 420 mm), the longitudinal length of the skin contact sheet 24 is 50 in both the urine passage opening 26a and the stool passage opening 26b. ˜150 mm is preferable, and the width direction length is preferably 1 to 100 mm.

  In the present invention, two regions (SCS side edge regions) 50 (50a) extending in the longitudinal direction along the side edges (SCS side edges) 36 (36a, 36b) of the skin contact sheet 24 shown in FIG. , 50b) is preferably a region having no stretching force in the width direction and the longitudinal direction. Thereby, air permeability can be further improved, and skin trouble can be further suppressed. The length in the width direction of one SCS side edge region 50 is preferably 2.5 to 25% of the entire width of the skin contact sheet (the length in the width direction of the skin contact sheet) per side. % Is more preferable. That is, when the both side edges are combined, it is preferably 5 to 50%, more preferably 10 to 20%. By setting the SCS side edge region in such a range, it is possible to better maintain the balance between the adhesion with the wearer's body and the prevention of skin trouble. Further, at least the SCS central region has a stretching force in the width direction, and the stretching force is preferably 2 to 20 (g / cm), and more preferably 5 to 10 (g / cm). By setting it as such a range, a skin contact sheet comes to contact | adhere moderately to a wearer.

  In this embodiment, in order to form the skin contact sheet 24 in this way, as shown in FIGS. 2 and 4, the elastic elastic material (opening elastic material) is arranged at a specific position. That is, in the present embodiment, the two opening outer regions 51a and 51b are regions that do not have the stretching force in the longitudinal direction and the width direction, and the SCS central region 32 is a region that has the stretching force in the width direction. In addition, the opening stretchable material is not disposed in the two opening outer regions 51a and 51b, and the opening stretchable material 28 (28a and 28b) is disposed in the SCS central region 32 so as to have a width direction component. Yes. In the SCS central region 30 of the skin contact sheet 24, the opening stretchable material 28 (28a, 28b) extends along the urine passage opening 26a and the stool passage opening 26b, along the SCS ventral region 32 and the SCS dorsal region 34. Are arranged so as to extend in the longitudinal direction. The opening stretchable material 28 forms an intersection P1 between the urine passage opening 26a and the stool passage opening 26b. Thus, although it is preferable to use a linear elastic elastic material as the opening elastic material, the breathable sheet itself constituting the skin contact sheet may have a structure having elasticity.

  Moreover, since it arrange | positions so that an opening part elastic material may extend in a diaper longitudinal direction as mentioned above, since an opening elastic material is continuously arrange | positioned, there exists an advantage that a continuous manufacture of a disposable diaper becomes easy and preferable. .

  In a disposable diaper provided with a skin contact sheet having two openings, feces and urine may not pass through the opening and remain on the skin contact sheet. This is because the skin contact sheet is not in close contact with the wearer's body due to the loosening between the two openings of the skin contact sheet, the position of the opening is not fixed, and the stool and urine are displaced from the opening. This is because it is excreted and falls onto the skin contact sheet. In order to ensure that urine and feces pass through the opening and fall onto the top sheet, the stretching force in the width direction of the SCS central region 30 of the skin contact sheet 24 is reduced in the width direction in the SCS ventral region 32. It is preferably larger than the stretching force and larger than the stretching force in the width direction in the SCS dorsal region 34. Thereby, when the disposable diaper 1 is attached to the wearer, the SCS central region 30 located between the two openings 26 (the urine passage opening 26a and the stool passage opening 26b) of the skin contact sheet 24 is loosened. Since it adheres closely to the wearer without urine or stool, the urine or stool can be reliably prevented from passing over the opening and falling onto the top sheet, and the urine or stool remaining on the skin contact sheet. The stretching force in the width direction of the SCS central region is 1.1 to 5 times the stretching force in the width direction of the SCS ventral region and the stretching force in the width direction of the SCS dorsal region. It is preferably 1.5 to 3 times. By setting the stretching force of the SCS central region in such a range, it is possible to further improve the adhesion with the wearer's body. As described above, the stretching force in the width direction of the SCS central region is preferably 2 to 20 (g / cm), more preferably 5 to 10 (g / cm). By setting it as such a range, a skin contact sheet comes to contact | adhere moderately to a wearer.

  In order to form the skin contact sheet 24 in this way, it is preferable to arrange the stretchable elastic material at a specific position as shown in FIGS. That is, the value obtained by dividing the sum of the width direction components (length) in the SCS central region 30 of the stretchable elastic material 24 by the longitudinal length L1 of the SCS central region 30 is the width direction component (length) in the SCS ventral region 32. And the sum of the width direction components (lengths) in the SCS dorsal region 34 is the length in the longitudinal direction of the SCS dorsal region. It is preferably larger than the value divided by L3. Thereby, the stretching force in the width direction in the SCS central region can be made larger than the stretching force in the width direction in each of the SCS ventral region and the SCS dorsal region.

  For example, the skin contact sheet 24 shown in FIG. 4 has two openings stretchable members 28a and 28b crossed at the SCS central region 30, that is, at the intersection P1 between the two openings 26a and 26b. The width direction component of the central region 30 is increased. The width direction component (length) H1 of the opening stretchable material 28a in the SCS central region 30 is determined from the intersection P2 between the boundary line between the SCS central region 30 and the SCS backside region 34 and the opening stretchable material 28a. This is the distance in the width direction to the intersection P3 between the boundary line between the central region 30 and the SCS ventral region 32 and the opening stretchable material 28a. Similarly, the width direction component (length) of the opening stretchable material 28b in the SCS central region 30 is the distance in the width direction between the intersections of the opening stretchable material 28b and the two boundary lines. Accordingly, the sum of the width direction components (lengths) of the two opening stretchable members 28a and 28b in the SCS central region 30 is referred to as the width direction component (length) of the opening stretchable member 28a in the SCS central region 30. ) The total length (total center region width) of H1 and the width direction component (length) in the SCS center region 30 of the opening stretchable member 28b.

  4, the width direction component (length) H2 in the SCS ventral region 32 of the opening stretchable member 28a is the boundary line between the SCS central region 30 and the SCS ventral region 32, and the opening. The distance in the width direction from the intersection P3 with the elastic material 28a to the point P4 closest to the SCS side edge 36a of the opening elastic material 28a in the SCS ventral region 32. And similarly about the width direction component (length) in the SCS ventral region 32 of the opening elastic member 28b, the boundary line between the SCS central region 30 and the SCS ventral region 32 of the opening elastic member 28b, The distance in the width direction from the intersection with the opening stretchable material 28b to the point closest to the SCS side edge 36b of the opening stretchable material 28b in the SCS ventral region 32. Accordingly, when the sum of the width direction components (lengths) of the two opening stretchable members 28a and 28b in the SCS ventral region 32 is referred to as the width direction component (in the SCS ventral region 32 of the opening stretchable member 28a) ( Length) Total length (total ventral region width) of H2 and the width direction component (length) in the SCS ventral region 32 of the opening stretchable member 28b.

  In addition, when the sum of the width direction components (lengths) of the two opening elastic members 28a and 28b in the SCS dorsal region 34 is the same as in the SCS ventral region 32, the opening elastic material The total length (back side region width total) of the width direction component (length) H3 in the SCS back side region 34 of 28a and the width direction component (length) in the SCS back side region 34 of the opening stretchable material 28b. ).

  The value obtained by dividing the total central region width of the skin contact sheet 24 by the longitudinal length L1 of the SCS central region 30 is divided by the longitudinal length L2 of the SCS ventral region 32. It is preferably larger than the value and larger than the value obtained by dividing the total dorsal region width by the longitudinal length L3 of the SCS dorsal region 34. By forming in this way, it is possible to make the width direction stretching force of the SCS central region 30 larger than both the width direction stretching force of the SCS ventral region 32 and the width direction stretching force of the SCS dorsal region 34. Thus, the SCS central region 30 can be brought into close contact with the wearer without loosening.

  As the arrangement pattern of the opening stretchable material, the above pattern is preferable, but the SCS central region has at least a stretching force in the width direction, and the two opening outer regions of the skin contact sheet have a stretching force in the width direction and the longitudinal direction. There is no particular limitation as long as it is formed so as to be a region that does not have a gap. For example, even if a region 31 where no opening stretchable material exists is formed between two openings (a urine passage opening 26a and a stool passage opening 26b) as in the skin contact sheet 24 shown in FIG. Good. The region 31 where the opening stretchable material does not exist is a region arranged so as to extend in a band shape between the two openings, and the width direction length is the maximum width of the opening (the maximum width direction length). Value) is preferably 10 to 100%, and at least the central region is preferably a non-stretchable region. In the region 31 where no opening stretchable material exists, the four openable stretchable materials are not connected between the two openings (the urine passing opening 26a and the stool passing opening 26b), respectively. Alternatively, it may be formed by arranging two opening stretchable members as shown in FIG. 4 and then cutting and snapping back at the intersection P1. Thereby, it becomes possible to eliminate skin troubles due to rubbing of the crotch portion when the wearer wears it. In this case, the sum of the width direction components in the SCS center region is the width direction component (length) H11 in the SCS center region 30 of the opening stretchable material 28c, and the width direction component in the SCS center region 30 of the opening stretchable material 28d ( Length) H12, the width direction component (length) in the SCS central region 30 of the opening stretchable material 28e, and the width direction component (length) in the SCS central region 30 of the opening stretchable material 28f.

  Further, for example, like the skin contact sheet 24 shown in FIG. 6, two opening stretchable members 28 (28g, 28h) extending in the width direction are formed on the skin contact sheet 24 shown in FIG. Further, it may be disposed on both sides in the width direction of the region 31 having no opening stretchable material. The opening stretchable material 28 (28g, 28h) is preferably disposed along the center line between the two openings (the urine passage opening 26a and the stool passage opening 26b).

  Further, for example, like the skin contact sheet 24 shown in FIG. 7, the two opening elastic members 28 (28 i, 28 j) are not intersected with the two opening elastic members 28 (28 i, 28 j), The two openings (the urine passage opening 26a and the stool passage opening 26b) may be disposed so as to be sandwiched from both side edge sides. At this time, in order to increase the expansion / contraction force in the width direction of the SCS central region 30, the two opening elastic members 28 (28 i, 28 j) are respectively arranged in the width direction central portion side (direction approaching each other) in the SCS central region 30. It is preferable to dispose it. In this case as well, two opening stretchable members 28 (28g, 28h) extending in the width direction may be disposed at positions on both outer sides in the width direction of the curved portion.

  If the opening stretchable material is arranged as described above, tension is applied to the skin contact sheet, so that the entire skin contact sheet can be firm. Therefore, it is possible to prevent the skin contact sheet from falling to the top sheet side, and there is an advantage that the skin contact sheet can easily come into contact with the wearer's skin. Further, when the opening stretchable material is disposed, the skin contact sheet is contracted, and the top sheet, the absorbent body, and the back sheet can act to bend downward (exterior member side). Therefore, the skin contact sheet can be kept floating from the top sheet, and the skin contact sheet and the top sheet can be reliably separated from each other.

  As the opening stretchable material, stretchable materials that have been used in conventional disposable diapers can be suitably used. Specifically, thread rubber made of an elastic material such as natural rubber or synthetic rubber (urethane rubber, etc.), flat rubber, etc., stretchable net, stretchable film, stretchable foam (urethane foam, etc.) and the like can be mentioned.

  Since the opening stretchable material is disposed along the opening, a contraction force in the longitudinal direction is generated around the opening. As the contraction force in the longitudinal direction, in the SCS dorsal region or the SCS ventral region, the contraction force in the longitudinal direction generated by the opening stretchable material disposed between the opening and the one side edge is 10 to 100. (Gf) is preferable, and 20 to 80 (gf) is more preferable. For example, in FIG. 4, in the SCS dorsal region 34, the longitudinal stretching force by the opening stretchable material 28 a is preferably in the above range, and the longitudinal stretching force by the opening stretchable material 28 b is in the above range. It is preferable. In this case, each opening stretchable material does not include a portion located in the SCS central region 30. Furthermore, it is preferable that the stretching force in the longitudinal direction in the predetermined region (the SCS dorsal region or the SCS ventral region) by the opening stretchable members 28a and 28b is within the above range. By setting it as such a range, it becomes possible to give moderate elastic force to a skin contact sheet. For example, when natural rubber is used, one having a thickness of 0.2 to 0.25 mm and a width of 1.6 to 2.4 mm is 150 to 300% (a natural length of 1.5 to 1.5%). (3 times) is preferably stretched and fixed. When urethane rubber is used, it is preferable to use 2 to 3 thread rubbers having a thickness of about 620 Dtex and extend them to 200 to 300% and arrange them in parallel.

  The opening stretchable material as described above is fixed to the skin contact sheet by an adhesive or other means. The fixing method may be, for example, adhesion using a hot melt adhesive or other highly fluid adhesive, or may be welding by heat such as heat sealing or ultrasonic waves.

  The opening stretchable material is preferably fixed in the stretched state, that is, in the stretched state, in order to exert a sufficient stretch force on the skin contact sheet. For example, when the opening stretchable material is natural rubber or synthetic rubber, it is preferably fixed in a stretched state of 100 to 400%, and more preferably fixed in a stretched state of 200 to 300%. When the material is natural rubber, it is preferably stretched and fixed to 150 to 300% as described above. By fixing in the stretched state in such a range, it is possible to cause a sufficient stretching force to act on the stretchable region of the skin contact sheet and to prevent the skin contact sheet from being reduced more than necessary.

  The arrangement method of the opening stretchable material is not particularly limited. For example, as in the disposable diaper 1 shown in FIGS. 1 to 3, the skin contact sheet 24 is bonded to two sheet materials (upper sheet 24 a and liner sheet 24 b). It is preferable to arrange them so that the opening elastic members 28a and 28b are sandwiched between the upper sheet 24a and the liner sheet 24b. Employing such an arrangement method is preferable because it can impart stretching force to the skin contact sheet with the minimum necessary stretching material.

  In the disposable diaper according to the present embodiment, a separation wall that divides the space between the skin contact sheet and the top sheet into a space communicating with the urine passage opening and a space communicating with the stool passage opening. It is preferable to provide it. When urine and feces are mixed, ammonia is generated. This ammonia makes the environment alkaline, and the enzymes in the stool are strongly activated in an alkaline atmosphere. The weakened areas of the skin are inflamed by this enzyme and ammonia, causing diaper rash. Has been reported to occur (Kazuya Yamamoto, Dermatology 30, 949-956 (1998)). By providing the separation wall as described above, it becomes possible to absorb and hold the urine excreted by the wearer in a state separated from the stool, so that the urine and the stool are hardly mixed, and diaper rash is effectively prevented. can do.

  As a method for fixing the skin contact sheet, (1) a method for fixing the skin contact sheet 24 on the surface of the top sheet 18 (or back sheet 20), and (2) when a three-dimensional gather is provided, A method of fixing the skin contact sheet 24 to the surface can be exemplified.

[1-2] Absorber:
The absorber is a member for absorbing and holding the wearer's urine. The absorber is made of an absorbent material because it needs to absorb and retain the wearer's urine and body fluid.

  Examples of the absorbent material constituting the absorber include conventionally known absorbent materials usually used for disposable diapers and other absorbent articles, such as fluff pulp, super absorbent polymer (Super Absorbent Polymer; hereinafter referred to as “SAP”). And a hydrophilic sheet. It is possible to use wood pulp or non-wood pulp defibrated as fluff pulp, sodium polyacrylate as SAP, tissue, absorbent paper, hydrophilized nonwoven fabric as hydrophilic sheet preferable.

  These absorbent materials are usually used as a single-layer or multi-layer mat. Under the present circumstances, 1 type may be used independently among the said absorptive materials, and 2 or more types may be used together. Especially, what used together about 10-500 mass parts SAP with respect to 100 mass parts of fluff pulp is preferable. At this time, the SAP may be uniformly mixed in each mat of fluff pulp, or may be arranged in layers between the layers of the multilayer fluff pulp.

  The absorber needs to be interposed at least in part between the top sheet and the back sheet. Usually, the absorber is interposed between the top sheet and the back sheet by being sandwiched between the top sheet and the back sheet and sealing the peripheral edge thereof. Therefore, the flap part in which the absorber is not interposed is formed between the top sheet and the back sheet at the peripheral part of the absorber.

  It is preferable that the absorber is entirely wrapped with a hydrophilic sheet. Such a configuration has an advantage that SAP can be prevented from leaking from the absorber and shape stability can be imparted to the absorber.

  Although there is no restriction | limiting in particular about the shape of an absorber, The shape used in the conventional disposable diaper and other absorbent articles, for example, a rectangular shape, an hourglass type, a gourd type, a T shape etc. can be mentioned.

[1-3] Top sheet:
A top sheet is a sheet | seat arrange | positioned so that the upper surface (surface located in a wearer's skin side at the time of mounting | wearing of a diaper) may be coat | covered. At least a part (all or a part) of the top sheet is made of a liquid-permeable material because the absorber disposed on the lower surface side needs to absorb the wearer's urine.

  Examples of the liquid permeable material constituting the top sheet include a woven fabric, a nonwoven fabric, and a porous film. Among these, it is preferable to use a non-woven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon and subjected to a hydrophilic treatment.

  The top sheet may be composed of a single sheet material, but may be composed of a plurality of sheet materials. For example, in the case of a tape-type diaper, a top sheet (center sheet) made of a liquid-permeable material is arranged at the center of the diaper, and a top sheet (side sheet) made of a water-repellent material at the side flap portion of the diaper. A form of arranging is often used.

[1-4] Backsheet:
A back seat | sheet is a sheet | seat arrange | positioned so that the lower surface (surface located in a wearer's clothing side at the time of mounting | wearing of a diaper) may be coat | covered. The back sheet is made of a liquid-impermeable material because it is necessary to prevent the wearer's urine from leaking outside the diaper.

  Examples of the liquid-impermeable material constituting the backsheet include a liquid-impermeable film made of a resin such as polyethylene. Among these, a microporous polyethylene film is preferably used. This microporous polyethylene film has a large number of fine pores of 0.1 to several μm, and is liquid impervious but has moisture permeability, so that the inside of the diaper can be prevented from being steamed There is.

  Note that a sheet material (cover sheet) may be bonded to the outer surface of the back sheet. This cover sheet is used to reinforce the back sheet and improve the feel (tactile feeling) of the back sheet.

  Examples of the material constituting the cover sheet include woven fabric and non-woven fabric. Especially, it is preferable to use the dry nonwoven fabric and wet nonwoven fabric which consist of thermoplastic resins, such as polyethylene, a polypropylene, and polyester.

[1-5] Absorbent body:
In the two-piece type pants-type diaper, the top sheet, the back sheet, and the absorbent body are configured as one member called an “absorbent body” that is responsible for absorption and holding functions, and an exterior member that is manufactured separately. A disposable diaper is formed by joining. Like the sanitary napkin, this absorbent main body has a top sheet on the upper surface side of the absorbent body and a back sheet on the lower surface side. The absorbent body is interposed between the top sheet and the back sheet. It has a structured. For example, the disposable diaper 1 shown in FIG. 1 to FIG. 3 includes the top sheet 18 and the back sheet by sandwiching the absorbent body 22 between the top sheet 18 and the back sheet 20 and sealing the periphery of the absorbent body 22. 20 is an example in which the absorbent main body 14 having a structure in which an absorber 22 is interposed between the absorbent body 14 and the absorbent body 14 is configured.

  An absorptive main body is comprised by the size which covers at least the crotch part of a diaper. However, in order to ensure the effect of preventing leakage, it is preferable to have a size that covers not only the crotch part but also a part of the front body and the back body. The absorptive main body can be fixed to the exterior member using, for example, a hot melt adhesive.

[1-6] Exterior member:
The exterior member is a member having a mounting function for encapsulating the wearer's body, and specifically, is a sheet-like member that forms the front body, the crotch portion, and the back body.

  In the two-piece type pants-type diaper, the absorbent main body serves exclusively for the absorption / holding function of absorbing and holding the excrement of the wearer, so a liquid-impermeable material as a material constituting the exterior member There is no need to use. Examples of the material constituting the exterior member include a nonwoven fabric composed of synthetic fibers made of polyethylene, polypropylene, polyester, and other thermoplastic resins.

  And in order to fix an exterior member in the state which pinched | interposed the elastic material etc. around the leg, it is often configured by bonding two or more nonwoven fabrics together. For example, in the disposable diaper 1 shown in FIGS. 1 to 3, the exterior member 16 is composed of two non-woven fabrics, and the leg elastic member 40, the waist elastic member 42, and the belly elastic member between the two non-woven fabrics. This is an example in which 44 is sandwiched and fixed.

[1-7] Various elastic materials:
In a pants-type disposable diaper, it is common to arrange an elastic material around the legs, arrange an elastic material around the waist, and more preferably arrange an elastic material around the abdomen.

  The leg circumference elastic material is an elastic material arranged along the leg circumference opening. By arranging the leg-stretchable material, a gather (leg gather) rich in stretchability can be formed in the leg-surrounding opening. Therefore, it is difficult to form a gap around the leg, and urine leakage from the opening around the leg can be effectively prevented.

  The waist elastic material is an elastic material arranged along the waist opening. By arranging the elastic material around the waist, a gather (waist gather) rich in elasticity can be formed in the waist opening. This waist gather makes it difficult for gaps to be formed around the waist, preventing urine leakage from around the waist, and improving the fit of the diaper to the wearer, thereby preventing the diaper from falling down.

  An abdominal circumference elastic material is an elastic material arrange | positioned in the part (namely, part equivalent to a wearer's abdominal circumference) between a waist circumference opening part and a leg circumference opening part. By arranging the elastic material around the abdomen, it is possible to form a highly elastic tammy gather around the abdomen of the wearer. This Tammy Gather, together with West Gather, can make the diaper fit and anti-slip effect even better.

  In the disposable diaper 1 shown in FIGS. 1 to 3, a plurality of leg-holes elastic members 40 are arranged on the periphery of the leg-hole openings 12 a and 12 b, and the waist-hole opening is provided on the periphery of the waist-hole opening 10. A plurality of waist elastic members 42 are disposed so as to surround 10, and a portion between the waist opening 10 and the leg openings 12 a and 12 b (that is, a portion corresponding to the wearer's abdomen). This is an example in which a plurality of belly stretchable members 44 are arranged so as to surround the wearer's belly.

  About these elastic materials, the structure similar to the opening part elastic material already described is employable. Then, after considering the degree of gather contraction and the like, the constituent material, the elongation rate of the material, the stretched state at the time of fixing, etc. may be determined.

[1-8] Solid gathering:
In order to prevent side leakage of urine excreted by the wearer, a three-dimensional gather may be provided. The three-dimensional gather is a member for preventing side leakage of the urine excreted by the wearer, and is a leak-proof wall configured to stand up three-dimensionally. Even if urine is excreted on the skin contact sheet and the urine is diffused through the skin contact sheet by forming the three-dimensional gather, the three-dimensional gather becomes a breakwater, and the opening around the leg of the diaper etc. Leakage (so-called “lateral leakage”) can be effectively prevented.

  The structure of a three-dimensional gather can employ | adopt the structure used for the conventional disposable diaper and other absorbent articles. For example, it is possible to suitably use a material in which a stretchable material (a three-dimensional gathered stretchable material) is arranged on a part of the sheet material, and a gather is formed on the sheet material by the three-dimensional gathered stretchable material.

[2] Manufacturing method:
Hereinafter, an example of the method of manufacturing the disposable diaper of the present invention will be described with reference to an example of manufacturing the disposable diaper 1 (two-piece type pants-type diaper) shown in FIGS.

[2-1] Production of absorbent main body:
An absorber 22 wrapped in a hydrophilic sheet is disposed on the upper surface of the back sheet 20, and a top sheet 18 is disposed on the upper surface. Next, the absorbent main body 14 is obtained by sealing with a hot melt adhesive or the like so that the peripheral edge of the absorbent body 22 is sandwiched between the top sheet 18 and the back sheet 20.

[2-2] Production of skin contact sheet:
The upper sheet 24a is bonded to the upper surface of the liner sheet 24b while arranging the two opening stretchable members 28a and 28b in a predetermined pattern. The upper sheet 24a is configured to cover only the center portion of the liner sheet 24b and to expose both side edges of the liner sheet 24b. As shown in FIG. 4, the two opening stretchable members 28a and 28b intersect at a point between the urine passage opening 26a and the stool passage opening 26b, which will be formed later, and the urine passage opening. It arrange | positions in the pattern which surrounds a part of periphery of the part 26a and the stool passage opening 26b.

  Next, the urine passage opening 26a and the stool passage opening 26b are formed in the bonded liner sheet 24b and upper sheet 24a. By doing so, the two opening elastic members 28a and 28b intersect at a point between the urine passage opening 26a and the stool passage opening 26b, and the urine passage opening 26a and the stool passage opening 26b. A skin contact sheet 24 having a two-layer structure arranged in a pattern surrounding a part of the periphery of the film is obtained.

[2-3] Attaching the skin contact sheet to the absorbent main body:
A skin contact sheet 24 is bonded to the surface of the top sheet 18 constituting the absorbent main body 14 using a hot melt adhesive or the like.

[2-4] Production of exterior member:
First, two nonwoven fabrics to be the exterior member 16 are prepared, and a waist elastic member 42, an abdominal elastic member 44, and a leg elastic member 40 are disposed on and bonded to the upper surface of one of the nonwoven fabrics. And by laminating and fixing another nonwoven fabric on the upper surface, the waist elastic member 42, the belly elastic member 44 and the leg elastic member 40 are interposed between the two nonwoven materials. The exterior member 16 is obtained.

[2-5] Manufacture of disposable diapers:
The absorbent main body 14 is disposed and fixed near the crotch part of the exterior member 16. Next, the absorbent body 14 is turned inside, and the front body 2 and the back body 6 are folded in two so that the front body 2 and the back body 6 are matched, and the front body 2 and the back body 6 are joined by means such as heat sealing to form the joint 8. By doing, the disposable diaper 1 shown in FIGS. 1-3 can be manufactured.

  The series of steps as described above can be continuously performed by mechanical means. For example, by adopting a method / apparatus such as continuously feeding a long sheet material or stretchable material from a roller, it becomes possible to continuously manufacture disposable diapers, which contributes to an improvement in productivity.

[3] Application target of the present invention:
The application object of the disposable diaper of this invention is not restricted to the said 2 piece type underpants type diaper, For example, it can apply also to a 1 piece type underpants type diaper and a tape type diaper. That is, also in these disposable diapers, by disposing a skin contact sheet in which two openings are formed and a predetermined opening stretchable material is disposed above the surface of the top sheet, the disposable diaper of the present invention is arranged. You can enjoy the effects of

  “One-piece type” includes a top sheet, a back sheet, and an absorber as in the case of the two-piece type. However, the absorber that performs absorption and holding functions is interposed between the top sheet and the back sheet. This means a diaper of a type that is (built-in) and configured integrally with a top sheet and / or a back sheet that has a mounting function.

  The “tape-type diaper” includes a top sheet, a back sheet, an absorber interposed in at least a part between the two sheets, and a tape fastener for wearing. It shall mean a disposable diaper that can fix the back and back parts to each other. “Tape-type diapers” also have “1-piece type” and “2-piece type” as in pants-type diapers, but the disposable diaper of the present invention is applicable to any type of tape-type diaper.

  The disposable diaper of the present invention can be suitably used as a diaper for infants or for adults such as elderly people and persons with disabilities who need care. The disposable diaper of the present invention can be used particularly suitably as a disposable diaper for infants because the excreted stool is not easily brought into direct contact with the wearer's skin, and the skin is weak and skin troubles are frequent.

It is a schematic perspective view which shows one Embodiment of the disposable diaper of this invention, and is a schematic perspective view which shows the state seen from the front of a diaper. It is a top view which shows one Embodiment of the disposable diaper of this invention, is a top view which expand | deploys the disposable diaper shown in FIG. 1, and shows the state seen from the absorptive main body side of the diaper. It is a schematic sectional drawing which shows one Embodiment of the disposable diaper of this invention, and is a schematic sectional drawing which shows the cross section which cut | disconnected the disposable diaper shown in FIG. 2 along the X-X 'line. It is a schematic plan view which shows the skin contact sheet used for one Embodiment of the disposable diaper of this invention. It is a schematic plan view which shows the skin contact sheet used for other embodiment of the disposable diaper of this invention. It is a schematic plan view which shows the skin contact sheet used for other embodiment of the disposable diaper of this invention. It is a schematic plan view which shows the skin contact sheet used for other embodiment of the disposable diaper of this invention.

Explanation of symbols

1: disposable diaper, 2: front body, 2a, 2b: side edge, 4: crotch, 6: back body, 6a, 6b: side edge, 8: joint, 10: waist opening, 12, 12a, 12b: Leg opening, 14: Absorbent body, 16: Exterior member, 18: Top sheet, 20: Back sheet, 22: Absorber, 24: Skin contact sheet, 24a: Upper sheet, 24b: Liner sheet , 26: opening, 26a: urine passage opening, 26b: stool passage opening, 28, 28a, 28b, 28c, 28d, 28e, 28f, 28g, 28h, 28i, 28j: opening stretchable material, 30 : SCS center region, 31: Region where the opening stretchable material is not disposed, 32: SCS ventral region, 34: SCS dorsal region, 36a, 36b: SCS side edge 40: Stretch material around leg, 42: Waist circumference Stretch material, 44: Stretch material around the abdomen, 50, 50a, 50b: SCS side edge region, 51, 51a, 51b: Opening outer region, P1, P2, P3: Intersection, P4: SCS side edge of the stretch elastic material H1, H2, H3, H11, H12: width direction components of the elastic elastic material, L1, L2, L3: length in the longitudinal direction.

Claims (5)

An absorber, a top sheet that is arranged so as to cover the upper surface of the absorber, and at least a part that is made of a liquid-permeable material, and a surface that covers the lower surface of the absorber, and is made of a liquid-impermeable material A disposable diaper comprising a front body, a crotch part and a back body,
A skin contact sheet (SCS) disposed on the top sheet;
The skin contact sheet has a stool passage opening and a urine passage opening through which urine can pass in a portion corresponding to the crotch,
A region (SCS central region) obtained by extending a band-shaped region (inter-opening region) extending in the width direction between the two openings to the front and rear by a length that is half the length between the openings, the SCS central region; It is composed of an SCS ventral region located on the ventral side and an SCS dorsal region located on the dorsal side,
At least the SCS central region of the skin contact sheet has a stretching force in the width direction,
The disposable diaper whose area | region (opening part outer side area | region) located in the longitudinal direction outer side of two said opening parts of the said skin contact sheet is an area | region which does not have the expansion-contraction force of the width direction and a longitudinal direction.   The disposable diaper according to claim 1, wherein both side edge regions (SCS side edge regions) of the skin contact sheet are regions having no stretching force in the width direction and the longitudinal direction.   The disposable diaper according to claim 2, wherein a width of one side of the SCS side edge region is 2.5 to 25% of a width of the entire skin contact sheet.   A stretchable elastic material (opening stretchable material) is disposed along the opening in the SCS central region of the skin contact sheet and extending in the longitudinal direction in the SCS ventral region and the SCS dorsal region. The disposable diaper according to any one of claims 1 to 3, wherein no opening stretchable material is disposed in the region.   The disposable diaper according to any one of claims 1 to 4, wherein the skin contact sheet is composed of a breathable sheet.

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