JP6747335B2 - Disposable diapers - Google Patents

Description

The present invention relates to a disposable diaper.

Conventionally, disposable diapers for infants and the elderly have been known. There are various types of disposable diapers, and for example, pants-type disposable diapers and tape-type disposable diapers are known (Patent Document 1, Patent Document 2, and Patent Document 3).

A pants-type disposable diaper is a type of disposable diaper in which both sides of the front body and the back body are joined in advance. As a pants-type disposable diaper, an integrated body in which an outer body on which an absorbent main body is placed is hung from the front body to the back body to be integrated (Patent Document 1), or the outer body is separated from the front body and the back body There is known a separation type (Patent Document 2) in which an absorbent main body is connected so as to bridge between a front body exterior body and a back body exterior body. Further, the tape-type disposable diaper is a type of disposable diaper in which adhesive tapes are attached to both sides of the front body or the back body and the front body and the back body are adhered by using the adhesive tape when worn (Patent Document 3). ).

In a disposable diaper, generally, a plurality of elastic members are fixed in a stretched state at the periphery of a waist opening formed by adhering the front body and the back body. These elastic members form waist gathers by tightening around the waist of the wearer so that the diaper does not slip downward due to the movement of the wearer and the weight of excrement. Thus, the function of forming the waist gathers around the waist opening to prevent the diaper from slipping off is an important function.

JP, 2009-254662, A JP, 2010-233733, A JP, 2005-323685, A

By the way, when a disposable diaper is worn, a part around the waist where waist gathers are formed has a part that easily adheres to the wearer's skin and a part that easily floats from the skin. For example, the diaper tends to adhere to the skin in the widthwise central portion (the portion that contacts the wearer's abdomen), but the sideways portion (the portion that contacts the hip bone) tends to float from the skin. The reverse case may also occur. Therefore, there is a concern that urine may leak in the portion where the diaper easily floats from the skin. However, the conventional disposable diapers have a uniform waist gather adhesion performance, and it has been difficult to prevent local urine leakage.

Therefore, the main object of the present invention is to partially adjust the adhesion performance of waist gathers and prevent local urine leakage.

The inventor of the present invention, as a result of extensive studies on means for achieving the above object, has fixed a plurality of elastic stretchable members around the abdomen of the front body and/or the back body in a stretched state along the width direction of the diaper and waist. It was found that the gathers are formed and the stretch rate at the central portion in the width direction of these elastic members is made different from the stretch rate at the side portions in the width direction. As described above, by partially changing the extension ratio of the elastic expansion/contraction member and fixing it to the front body or the back body, it is possible to partially adjust the adhesion to the wearer's skin. Therefore, for example, by increasing the extension rate of the portion that easily floats from the skin, it is possible to prevent urine leakage from that portion. Then, the present inventor has realized that the problems of the prior art can be solved based on the above knowledge, and completed the present invention.

The present invention relates to a disposable diaper. The present invention can be applied to both pants-type and tape-type disposable diapers. In particular, the present invention is preferably applied to a pants-type disposable diaper. The disposable diaper is divided in its longitudinal direction into a front body 1, a back body 2, and a crotch portion 3 located therebetween. A plurality of elastic stretchable members 43 are fixed to the front body 1 and/or the back body 2 or to any one of the bodies in a stretched state along the width direction at intervals in the longitudinal direction. As a result, waist gathers are formed around the abdomen of the front body 1 and the back body 2. Here, the elastic expansion/contraction member 43 has a center portion 43C in the width direction and left and right side portions 43L, 43R in the width direction. In this case, the elastic expansion/contraction member 43 is characterized in that the extension rate in the central portion 43C and the extension rate in at least one of the left and right side portions 43L and 43R are different when the body is completely extended in the width direction. To do.

The "stretching rate" is a ratio showing an increase in the length of the elastic stretchable member in the stretched state, with the length of the elastic stretchable member in the contracted state (natural state) being 100%. For example, when the elastic stretchable member of 10 cm is stretched to 20 cm, the extension rate is 200%. Further, the "state in which the body is completely stretched in the width direction" means a state in which the body to which the elastic expansion and contraction member is fixed is stretched to the maximum in the width direction so that the body does not break or tear. ..

As in the above-described configuration, by making the expansion ratio of the elastic expansion/contraction member 43 different between the central portion 43C and the side portions 43L and 43R, the adhesion performance of the waist gathers can be partially adjusted. For example, when the diaper easily floats from the skin in the side portions 43L and 43R of the diaper, the adhesion of the diaper can be improved by increasing the extension rate of the elastic stretchable member 43 in the side portion. Further, when the diaper easily floats from the skin in the central portion 43C of the diaper, the expansion rate of the elastic stretchable member 43 in the central portion 43C may be increased.

In the disposable diaper according to the present invention, the elastic expansion/contraction member 43 preferably has a higher extension rate in the side portions 43L and 43R than in the central portion 43C. For example, the extension rate in the side portions 43L and 43R may be 1.1 times or more, preferably 1.2 times or more, or 1.5 times or more, as compared with the extension rate in the central portion 43C. ..

Generally, the side part of the diaper easily floats from the wearer's skin, and it is preferable to improve the leakage of urine from this part. Therefore, such a problem can be effectively solved by increasing the expansion rate in the lateral portions 43L and 43R of the elastic expansion/contraction member 43 as in the above-described configuration.

The disposable diaper according to the present invention preferably has a so-called “flute structure”. That is, in the disposable diaper, the cushion portion 40 is formed on both or one of the front body 1 and the back body 2. The cushion portion 40 includes the elastic stretchable member 43, the inner sheet 41, the outer sheet 42, and the cushion forming sheet 44. The outer sheet 42 is located on the non-skin-facing surface side of the inner sheet 41. The cushion forming sheet 44 is intermittently formed on the inner sheet 41 and/or the outer sheet 42 such that the joint portions 51 and the non-joint portions 52 extending in the longitudinal direction are alternately continuous in the width direction. It is joined. The elastic stretchable member 43 is fixed by being sandwiched between the inner sheet 41 and the outer sheet 42 in a stretched state along the width direction.

As in the above configuration, the flute structure has a pair of seats 41 and 42 for sandwiching and fixing the elastic expansion and contraction member 43, and a cushion forming seat 44 for wrinkle formation joined thereon by intermittent joints 51. Have. In the flute structure, when the elastic expansion/contraction member 43 contracts, the cushion forming sheet 44 floats in the non-bonding portion 52. In this way, by forming an air passage (space) between the cushion forming sheet 44 and the pair of sheets sandwiching the elastic expansion/contraction member 43, the hardness of the pair of sheets sandwiching the elastic expansion/contraction member 43 is directly increased. It becomes difficult to reach the skin. Therefore, by forming a flute structure, it is possible to impart breathability, flexibility, and cushioning properties to the entire waist gather.

In the disposable diaper which concerns on this invention, it is preferable that the space|interval in the width direction of the joint part 51 in side part 43L, 43R is wider than the space|interval of the joint part 51 in the center part 43C.

As described above, the present invention enhances the adhesion performance of the diaper by partially increasing the expansion rate of the elastic expansion/contraction member 43. However, the tightening becomes strong in the portion where the elongation rate is high, which may give the wearer a feeling of pressure and tightening. In this respect, as described above, by widening the spacing between the joint portions 51 for forming the flute structure in the portions (lateral portions 43L, 43R) where the elastic expansion and contraction member 43 has a high elongation rate, the portions are increased in that portion. It is possible to form a relatively large ventilation path (cushion) having a high cushioning effect. As a result, it is possible to improve the adhesion performance of the diaper and avoid giving the wearer a feeling of pressure.

The disposable diaper according to the present invention further includes an absorbent main body 30. The absorbent main body 30 is provided so as to extend in the longitudinal direction from the crotch part 3 to the front body 1 and the back body 2. The absorbent main body 30 includes an absorbent body 31, a top sheet 32 arranged on the skin facing surface side of the absorbent body 31, a back sheet 33 arranged on the skin non-facing surface side of the absorbent body 31, and a top sheet 32. It has a pair of side sheets 34 arranged on both left and right sides of the skin facing surface side. The side seats 34 form a so-called “three-dimensional gather”. That is, the side sheet 34 has a joining line 61 extending along the longitudinal direction, a joining region 62 joined to the skin-facing surface of the top sheet 32 outside the joining line 61 in the width direction, and a width wider than the joining line 61. And an upright region 63 on the inner side in the direction. At least a part of the standing region 63 is a free portion 63a that is not joined to the top sheet 32, and one or a plurality of three-dimensional gather elastic members 35 are fixed to the free portion 63a in an extended state along the longitudinal direction. Has been done. Here, the three-dimensional gather elastic member 35, in a state in which the side sheet 34 is completely extended in the longitudinal direction, has an extension rate in the central portion 35C in the longitudinal direction and at least one of the front and rear end portions 35F, 35R in the longitudinal direction. Different rates are preferred. In addition, "a state in which the side sheet is completely extended in the width direction" means that the side sheet 34 to which the three-dimensional gather elastic member 35 is fixed is the maximum in the longitudinal direction to the extent that the side sheet 34 does not break or tear. Means a state of extended stretch.

As described above, it is preferable to partially adjust not only the elastic expansion/contraction member 43 forming the waist gathers but also the expansion rate of the three-dimensional gather elastic members 35 forming the three-dimensional gathers. As a result, the rising performance and the adhesion performance of the three-dimensional gather can be appropriately adjusted according to the type and size of the disposable diaper. For example, the extension rate of the three-dimensional gather elastic member 35 may be increased in a region where urine leakage easily occurs.

In the present invention, it is preferable that the three-dimensional gather elastic member 35 has a higher extension rate in the end portions 35F and 35R than in the center portion 35C. For example, the extension rate in the end portions 35F and 35R may be 1.1 times or more, and preferably 1.2 times or more, or 1.5 times or more, the extension rate in the central portion 35C.

As in the above-described configuration, the extension ratios at the front and rear end portions 35F and 35R of the three-dimensional gather elastic member 35 are increased. Generally, since the three-dimensional gathers are easily separated from the wearer's skin in the front and rear portions in the longitudinal direction, by increasing the extension rate of the three-dimensional gather elastic member 35 in this portion, the three-dimensional gathers are easily attached to the skin. Urine leakage can be effectively prevented.

According to the present invention, the adhesion performance of waist gathers can be partially adjusted to prevent local urine leakage.

FIG. 1 is an external perspective view showing an embodiment of a disposable diaper according to the present invention. FIG. 2 is a development view showing an embodiment of the disposable diaper according to the present invention. FIG. 3 is a sectional view taken along line III-III shown in FIG. FIG. 4 is an enlarged development view conceptually showing the exterior body. FIG. 5 is an enlarged development view conceptually showing the absorbent main body. FIG. 6 is a sectional view taken along the line VI-VI shown in FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the modes described below, and includes those appropriately modified from the modes below within the scope obvious to those skilled in the art.

In the present specification, the “front body” means a portion that covers the ventral side (front of the body) of the wearer when the wearer wears the diaper. Further, the "inseam" means a portion that covers the inseam of the wearer when the wearer wears the diaper. Further, the "rear body" means a portion that covers the wearer's back side (back of the body) when the wearer wears the diaper.
In addition, in the present specification, the "longitudinal direction" basically means a direction (Y direction) connecting the front body and the back body of the disposable diaper. The "width direction" basically means the direction (X direction) orthogonal to the longitudinal direction of the disposable diaper.
Further, in the present specification, “A to B” means “A or more and B or less”.

[1. Overall configuration of disposable diaper]
The present invention is widely applicable to, for example, known pants-type disposable diapers and tape-type disposable diapers. The pants-type disposable diaper is a disposable diaper of a type in which both sides of the front body and the back body are joined in advance (for example, Patent Document 1). Further, a tape-type disposable diaper is a type of disposable diaper in which adhesive tapes are attached to both sides of the front body or the back body and the front body and the back body are adhered by using the adhesive tape when worn (for example, patent Reference 3). In addition, the pants-type disposable diaper is an integral type in which the exterior body is integrated from the front body to the back body (for example, Patent Document 1), or a separation in which the exterior body of the front body and the exterior body of the back body are separated. There is a type (for example, Patent Document 2). Of the various types of disposable diapers described below, the content of the present invention will be specifically described by taking the separation type of pants-type disposable diapers as an example.

FIG. 1 is an external perspective view showing an example of the disposable diaper 100 viewed from the front side. Further, FIG. 2 is a development view showing an example of a disposable diaper, showing a state in which the disposable diaper is viewed from the skin facing surface side. As shown in the development view of FIG. 2, the disposable diaper 100 has a front body 1 that contacts the abdomen of the wearer when worn, a back body 2 that contacts the back of the wearer, and a wearer in the longitudinal direction. It is divided into a crotch part 3 which is applied to the crotch part of the. In the present embodiment, in the disposable diaper 100, the front body exterior body 10 constitutes the front body 1, and the rear body exterior body 20 constitutes the rear body 2. The absorptive main body 30 is arranged so as to span the crotch portion 3 between the front body exterior body 10 and the rear body exterior body 20. That is, one end of the absorbent main body 30 is fixed to the front body exterior body 10, and the other end of the absorbent main body 30 is fixed to the rear body exterior body 20.

From the unfolded state shown in FIG. 2, the front body exterior body 10 and the rear body exterior body 20 are joined at their widthwise ends to be assembled into the state shown in FIG. As shown in FIG. 1, the waist opening 4 is formed by the upper edge of the front body exterior body 10 and the upper edge of the rear body exterior body 20. Further, by joining the both ends of the front body exterior body 10 and the rear body exterior body 20 to each other, the leg openings 5 located around the legs of the wearer are formed at the time of wearing. Therefore, the wearer can put on the disposable diaper 100 by inserting both legs from the waist opening 4 and pulling out the legs from the leg openings 5.

Further, as shown in FIG. 2, in the present embodiment, a cushion portion 40 is formed on each of the front body exterior body 10 and the rear body exterior body 20. The cushion portion 40 is formed so as to extend in the width direction along the edge that forms the waist opening 4. The cushion portion 40 includes a plurality of waist elastic members 43 (elastic elastic members). Further, the cushion portion 40 may include a plurality of Tammy elastic members 46 (elastic elastic members). The plurality of waist elastic members 43 extend in the width direction of the disposable diaper along the end portions of the front body exterior body 10 and the rear body exterior body 20 corresponding to the opening edges of the waist opening portion 4. The plurality of waist elastic members 43 are fixed in a stretched state, and by contracting the plurality of waist elastic members 43, waist gathers are formed near the waist opening 4. The plurality of tammy elastic members 46 extend in the width direction at positions closer to the crotch than the waist elastic members 43. The plurality of tammy elastic members 46 are fixed in an expanded state, and when the plurality of tammy elastic members 46 contract, a tammy gather is formed. In addition, as shown in FIG. 2, it is preferable that the Tammy elastic member 46 loses the contracting force by cutting at the portion where the absorbent main body 30 overlaps. As a result, it is possible to prevent the absorbent main body 30 from bending when the tammy elastic member 46 contracts.

In the present embodiment, the cushion portion 40 is provided on both the front body exterior body 10 and the rear body exterior body 20. However, in the present invention, the cushion portion 40 may be provided on at least one of the front body exterior body 10 and the rear body exterior body 20.

[2. Parts of disposable diaper]
Next, an example of the configuration of each part of the disposable diaper 100 will be described with reference to the drawings.

[2-1. Basic structure of cushion part]
FIG. 3 shows a cross-sectional view taken along the line III-III shown in FIG. In the cross-sectional view of FIG. 3, various sheet members constituting the disposable diaper are drawn with a conceptual thickness, but the sheet member constituting the disposable diaper is usually very thin.

As shown in FIG. 3, the front body exterior body 10 and the back body exterior body 20 (hereinafter, also collectively referred to as “exterior body 10, 20”) are configured to include a cushion portion 40. The cushion portion 40 is a means for forming waist gathers around the waist opening 4 of the disposable diaper, and is composed of a plurality of sheet members and elastic members.

As shown in the cross-sectional view of FIG. 3, the cushion portion 40 includes an inner sheet 41 located on the skin facing surface side, an outer sheet 42 located on the skin non-facing surface side, and the inner seat 41 and the outer seat 42. A plurality of waist elastic members 43 and a tammy elastic member 46 (also collectively referred to as “elastic elastic member” in the present specification) fixed between the two. As shown in FIG. 3, the inner sheet 41 and the outer sheet 42 together form the longitudinal edges of the disposable diaper. That is, the inner sheet 41 and the outer sheet 42 form the edges along the waist opening 4 of the disposable diaper. Further, as shown in the plan view of FIG. 2, the plurality of elastic stretchable members 43, 46 extend in parallel along the width direction of the disposable diaper. Further, the plurality of elastic expansion/contraction members 43, 46 are arranged at predetermined intervals in the longitudinal direction of the disposable diaper. Although the inner sheet 41 and the outer sheet 42 are separated from each other in the example shown in FIG. 3, these sheets 41 and 42 may be connected and integrally formed. That is, one sheet member may be folded back at the waist edge so that the skin-facing surface side portion becomes the inner sheet 41 and the skin-non-facing surface side portion becomes the outer sheet 42.

The plurality of elastic expansion/contraction members 43, 46 are fixed between the inner sheet 41 and the outer sheet 42 in a state of extending in the width direction. The expansion rate when the plurality of waist elastic members 43 are fixed is preferably, for example, in the range of 150 to 400%, 180 to 380%, or 200 to 360%. In this way, since the elastic elastic members 43, 46 in the stretched state are formed between the inner sheet 41 and the outer sheet 42, when the elastic elastic members 43, 46 contract, the inner sheet 41 and the outer sheet 42. Wrinkles (gathers) are formed on the. It is preferable to use a thread-shaped elastic rubber or a band-shaped elastic rubber as the elastic expansion/contraction members 43 and 46. As such a rubber material, a material such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, or polyester can be used.

Further, in the present embodiment, the cushion portion 40 includes a cushion forming sheet 44 arranged on the skin facing surface side of the inner sheet 41. The cushion forming sheet 44 is a sheet member that comes into direct contact with the skin of the wearer of the disposable diaper, and has a function of forming wrinkles (gather) on the skin-facing surface side of the inner sheet 41. The cushion forming sheet 44 may be further arranged on the non-skin-facing surface side of the outer sheet 42. Further, the cushion forming sheet 44 laminated on the inner sheet 41 and the cushion forming sheet 44 laminated on the outer sheet 42 may be integrally connected.

The joint portion 51 between the cushion forming sheet 44 and the inner sheet 41 is formed intermittently along the width direction (X direction) of the diaper. That is, the cushion forming sheet 44 and the inner sheet 41 are joined along the width direction of the diaper so that the joining portions 51 and the non-joining portions 52 are alternately continuous. It is preferable that the widthwise intervals of the joint portions 51 be, for example, 5 to 20 mm, 6 to 18 mm, or 7 to 16 mm. At the joint portion 51, the cushion forming sheet 44 and the inner sheet 41 may be joined by a hot melt adhesive or the like, or the cushion forming sheet 44 and the inner sheet 41 may be fused by heat sealing or ultrasonic sealing. Good. In addition, the joint portion 51 is basically formed linearly along the longitudinal direction (Y direction) of the diaper. Each joint 51 may be formed by one straight joining line. Further, each of the joint portions 51 may be formed by a group of joint points in which a plurality of linear or dot-shaped (dotted) joint points are intermittently formed in the longitudinal direction (Y direction). The lateral width of each joint 51 is narrower than the width of the non-joint 52, and is preferably 1/2 or less of the width of the non-joint 52. In the example shown in the figure, one joint portion 51 is formed by a group of a plurality of linear joint points, and a predetermined gap (about 0.5 to 2 mm) is provided between the joint points. ing. At least, the distance in the longitudinal direction between the joint points that form a certain joint 51 is smaller than the distance between the joints 51 in the width direction.

The elastic stretchable members 43, 46 are sandwiched and fixed in a stretched state between the inner sheet 41 and the outer sheet 42. Further, the cushion forming sheet 44 is joined to the skin facing surface side of the inner sheet 41 at the joining portion 51 formed intermittently in the width direction. Wrinkles are formed on the cushion forming sheet 44 as the elastic stretchable members 43 and 46 contract. That is, when the elastic stretchable members 43 and 46 contract, the cushion forming sheet 44 separates from the inner sheet 41 at the non-joint portion 52, and a ventilation path (space) is formed between the cushion forming sheet 44 and the inner sheet 41. It is formed. Such a structure is referred to as a "flute structure" in the present specification. In this way, by forming an air passage between the joints 51 formed intermittently, the hardness of the inner sheet 41 sandwiching the elastic stretchable members 43 and 46 is directly applied to the wearer's skin. It becomes difficult to communicate. In addition, by forming a “flute structure”, breathability, flexibility, and cushioning properties can be imparted to the entire waist gather.

Moreover, in this embodiment, as shown in FIG. 3, the inner sheet 41 extends toward the crotch portion 3 of the diaper. Then, a part of the inner sheet 41 is superposed on the longitudinal end of the absorbent body 30 (skin-facing surface). In this way, by superposing a part of the inner sheet 41 on the absorbent main body 30, the absorbent main body 30 is firmly fixed to the outer casings 10 and 20 and becomes hard to come off.

The outer casings 10 and 20 are configured to further include an inner sheet 45 and a tammy elastic member 46. That is, as shown in FIG. 3, in the present embodiment, the outer sheet 42 extends in the direction of the crotch portion 3, and a part of the outer sheet 42 is located on the skin non-facing surface side of the absorbent main body 30. There is. Here, the inner sheet 45 is arranged on the skin facing surface side of the extending portion of the outer sheet 42. Between the extending portion of the outer sheet 42 and the inner sheet 45, one or a plurality of Tammy elastic members 46 are sandwiched and fixed. Similar to the elastic stretchable members 43, 46, the tammy stretchable member 46 is fixed between the extending portion of the outer sheet 42 and the inner sheet 45 in the stretched state along the width direction of the diaper.

[2-3. Expansion rate of elastic stretchable members]
Next, the elastic stretchable member (especially the waist stretchable member 43) forming the waist gather will be described in more detail. FIG. 4 is an enlarged view of the rear body exterior body 20. FIG. 4A shows a typical example of the rear body exterior body 20, and FIG. 4B shows a modified example of the rear body exterior body 20. Although the rear body exterior body 20 is shown as an example here, it can be replaced with the front body exterior body 10. Therefore, here, both the outer casings 10 and 20 will be described.

As shown in FIG. 4( a ), a plurality of waist-surrounding regions of the outer casings 10 and 20, specifically, a region between the longitudinal edge of the absorbent main body 30 and the edge of the waist opening are provided with a plurality of regions. The waist elastic member 43 is fixed in a stretched state along the width direction. Therefore, the waist elastic members 43 are arranged so as not to overlap the absorbent main body 30. Each waist elastic member 43 has a central portion 43C, a left side portion 43L located on the left side of the central portion 43C, and a right side portion 43R located on the right side of the central portion 43C. In the example shown in FIG. 4(a), the portion where the absorbent main body 30 is present in the longitudinal direction is the central portion 43C, and the left and right portions where the absorbent main body 30 is not present in the longitudinal direction are respectively The left side portion 43L and the right side portion 43R are used.

Here, when the waist elastic member 43 is fixed to the exterior body 10 or 20, the expansion rate in the central portion 43C is different from that in both the left side portion 43L and the right side portion 43R, or at least one of them. There is. The extension rate in the central portion 43C may be different from the extension rate of both the left side portion 43L and the right side portion 43R, or different from the extension rate of either one of the left side portion 43L and the right side portion 43R. It may be the same as the elongation rate of the other. In the present invention, the extension rate of the central portion 43C is different from the extension rates of both the left side portion 43L and the right side portion 43R, and the extension rates of the left side portion 43L and the right side portion 43R are substantially the same. Is preferred.

More specifically, the waist elastic member 43 preferably has an extension rate at the left and right side portions 43L and 43R higher than that at the central portion 43C. For example, the extension rates of the left and right side portions 43L and 43R are preferably 1.1 to 3 times, 1.2 to 2.5 times, or 1 times the extension rate of the central portion 43C. It is preferably 0.5 to 2 times. However, it is preferable that the extension rate in each part (43C, 43L, 43R) of the waist elastic member 43 is in the range of 150 to 400%, 180 to 380%, or 200 to 360%. The extension rate of at least a part of the left and right side portions 43L, 43R may be set higher than the extension rate of at least a part of the central portion 43C, and the left and right side portions 43L, 43R do not necessarily have to have the same extension ratio. The extension rate does not have to be set higher than the extension rate of the entire central portion 43C. When measuring the extension rate of the waist elastic member 43, the measurement is performed in a state where the outer casings 10 and 20 to which the waist elastic member 43 is fixed are completely extended in the width direction. Specifically, each part (43C, 43L, 43R) of the waist elastic member 43 is cut by a predetermined length α (eg, α=30 mm) in a state where the outer casings 10 and 20 are completely extended in the width direction. Then, the elongation rate (α/β) is determined by comparing the length β of the cut pieces in the natural state (contracted state) with the predetermined length α.

In this way, by making the extension rate of the waist elastic member 43 different between the central portion 43C and the side portions 43L and 43R, the adhesion performance of the waist gathers can be partially adjusted. For example, when the diaper easily floats from the skin in the side portions 43L and 43R of the diaper, the adhesion of the diaper can be improved by increasing the extension rate of the elastic stretchable member 43 in the side portion. Further, when the diaper easily floats from the skin in the central portion 43C of the diaper, the extension rate of the waist elastic member 43 in the central portion 43C may be increased. In particular, since the side part of the diaper easily floats from the wearer's skin, it is preferable to improve urine leakage from this part. Therefore, such a problem can be effectively solved by increasing the expansion rate in the lateral portions 43L and 43R of the elastic expansion/contraction member 43 as in the above-described configuration.

When the waist elastic member 43 is fixed to the outer casing 10, 20, the waist elastic member 43 is sandwiched between the inner sheet 41 and the outer sheet 42. For example, the waist elastic member 43 itself may be coated with an adhesive, and the waist elastic member 43 coated with the adhesive may be sandwiched between the inner sheet 41 and the outer sheet 42. Alternatively, for example, after applying the adhesive to both or one of the inner sheet 41 and the outer sheet 42, the waist elastic member 43 can be sandwiched between the sheets 41 and 42 and fixed. In this way, when the waist elastic member 43 is fixed to the outer casing 10, 20, the expansion rate of the waist elastic member 43 is partially increased or decreased. Thereby, the extension rate of the waist elastic member 43 can be partially adjusted.

Next, FIG. 4(b) shows a modification of the embodiment shown in FIG. 4(a). The embodiment of FIG. 4(b) is the same as the embodiment of FIG. 4(a) in that the expansion rate of the left and right lateral portions 43L, 43R is set higher than the expansion rate of the central portion 43C. On the other hand, in the embodiment of FIG. 4B, the spacing between the joints 51 for forming the flute structure is smaller in the left and right side portions 43L and 43R than in the central portion 43C. Widely set.

More specifically, in FIG. 4B, the distance between the joints 51 in the side portions 43L and 43R is indicated by reference numeral S1, and the distance between the joints 51 in the central portion 43C is indicated by reference numeral S2. .. For example, the interval S1 is preferably set to 1.1 times to 2.5 times or 1.2 times to 2 times the interval S2. However, it is preferable that the widthwise intervals S1 and S2 of the joint portion 51 be within a range of 5 to 20 mm, 6 to 18 mm, or 7 to 16 mm. In this way, by widening the interval S1 between the joint portions 51 in the side portions 43L and 43R, the width of the ventilation passage (space) formed in the side portions 43L and 43R when the waist elastic member 43 contracts. growing. The air passage with a large width has a high cushioning property. As described above, in the present embodiment, since the diaper adhesion performance is enhanced by partially increasing the extension ratio of the waist elastic member 43 in the side portions 43L and 43R, the wearer can feel a feeling of pressure and tightening. Although there is a possibility of giving it, in the portion where the extension rate of the waist elastic member 43 is set to be high, the gap between the joint portions 51 is widened to enhance the cushioning action, thereby enhancing the adhesion performance of the diaper and the wearer. It is possible to avoid giving a feeling of pressure to the.

[2-4. Absorbent body]
As shown in FIG. 2 and FIG. 3, the absorbent main body 30 is held in a state of being bridged between the front body exterior body 10 and the back body exterior body 20, and is worn when the disposable diaper 100 is worn. It is located in the crotch of the wearer and absorbs and holds liquid such as urine excreted by the wearer. The absorptive main body 30 is arranged centering on the crotch part 3 of the disposable diaper and extending over the front body 1 and the back body 2. 5 is a plan view showing the absorbent main body 30 extracted, and FIG. 6 is a sectional view taken along line VI-VI of FIG. As shown in FIGS. 5 and 6, the absorbent main body 30 includes an absorbent body 31, a top sheet 32, a back sheet 33, a side sheet 34, a three-dimensional gather elastic member 35, a leg elastic member 36, and a cover sheet. 37 are provided.

The absorber 31 is a member for absorbing a liquid such as urine and holding the absorbed liquid. The absorber 31 is arranged between a liquid-permeable top sheet 32 and a liquid-impermeable back sheet 33. The absorber 31 has a function of absorbing the liquid that has passed through the top sheet 32, and is made of an absorbent material. A known material can be adopted as the absorbent material forming the absorber 31. As the absorbent material, for example, flap pulp, super absorbent polymer, or hydrophilic sheet may be used. The absorbent body 31 is preferably wrapped with the core wrap sheet 31a. As the core wrap sheet 31a, tissue paper, absorbent paper, hydrophilic non-woven fabric or the like can be appropriately used.

The top sheet 32 is a member for directly contacting the skin of the crotch of the wearer and allowing liquid such as urine to pass through to the absorber 31. Therefore, the top sheet 32 is made of a liquid-permeable material having high flexibility. The top sheet 32 is arranged so as to cover the skin contact surface side of the absorber 31. An example of the liquid-permeable material forming the top sheet 32 is a woven cloth, a non-woven cloth, or a porous film. As the top sheet 32, fibers made of thermoplastic resin such as polypropylene, polyethylene, polyester, and nylon may be hydrophilically treated to form a non-woven fabric.

The back sheet 33 is a member for preventing the liquid that has penetrated the top sheet 32 and is absorbed by the absorber 31 from leaking to the outside of the diaper. Therefore, the back sheet 33 is made of a liquid impermeable material. The back sheet 33 covers the absorber 31 from the non-skin contact side in order to prevent liquid leakage from the bottom surface of the absorber 31. An example of the impermeable material forming the back sheet 33 is a liquid impermeable film made of polyethylene resin. In particular, it is preferable to use a microporous polyethylene film having a plurality of fine pores of 0.1 to 4 μm formed.

Next, a structure for forming a three-dimensional gather will be described. As shown in FIGS. 5 and 6, a pair of side sheets 34 are superposed on the left and right sides in the width direction on the skin facing surface side of the top sheet 32 over the entire longitudinal direction. The pair of side sheets 34 are sheet members that stand up along both side edges of the absorber 31 to form a solid gather that prevents lateral leakage of urine. Therefore, the side sheet 34 is made of a liquid impermeable material. In particular, it is preferable to use a sheet member having water repellency and air permeability as the side sheet 34. For example, as the side sheet 34, a spunbonded non-woven fabric (SS, SSS, etc.), an SMS non-woven fabric (SMS, SSMMS, etc.), a melt-blown non-woven fabric having excellent flexibility is subjected to a water repellent treatment with silicone or the like. Can be preferably used. In particular, as the side sheet 34, it is preferable to use a nonwoven fabric sheet such as SMS or SMMS having high waterproofness and air permeability, which is subjected to a water repellent treatment.

As shown in FIG. 5, the pair of side sheets 34 each include a joining line 61, a joining region 62, and a standing region 63. The joining line 61 of the side sheet 34 is formed in a straight line extending straight along the longitudinal direction and serves as a boundary line between the joining region 62 and the standing region 63. Further, as shown in FIG. 2, the joining line 61 of the side sheet 34 is preferably formed on the skin-facing surface of the top sheet 32.

The joining region 62 of the side sheet 34 is a region located outside the joining line 61 in the width direction. In this joining region 62, the side sheet 34 is entirely joined to the skin-facing surface of the top sheet 32. A known adhesive such as a hot melt adhesive may be used to join the side sheet 34 and the top sheet 32, or they may be fused by heat sealing or ultrasonic sealing. Well

The standing region 63 of the side sheet 34 is a region located inside the joining line 61 in the width direction. The standing region 63 is divided into a free portion 63a located in the crotch portion 3 at the center in the longitudinal direction, a joint portion 63b located on the front body 1 side, and a joint portion 63c located on the rear body 2 side. The side sheet 34 is joined to the skin-facing surface of the top sheet 32 at the front and rear joining portions 63b and 63c. On the other hand, in the free portion 63a located between the joining portions 63b and 63c, the side sheet 34 is not joined to the skin-facing surface of the top sheet 32. Therefore, the side sheet 34 is separated from the top sheet 32 in the free portion 63a of the standing area 63 and can stand up freely. The free portion 63a of the standing area 63 is a portion forming a three-dimensional gather. For this reason, it is preferable that the free portion 63a of the standing region 63 extends at least over the entire crotch portion 3 as viewed in the longitudinal direction and has a length that reaches the front body 1 and the back body 2.

Further, as shown in FIG. 6, in the standing region 63 of the side seat 34, it is preferable that the leading end portion (edge) on the inner side in the width direction is folded back, and the sheet member has a folded portion 64 that is doubly overlapped. .. The folded portion 64 of the side seat 34 is formed over the entire longitudinal direction of the side seat 34. The folding|returning part 64 may be formed so that the inner edge of the side seat|sheet 34 may be folded back toward inner side of the width direction. Although not shown, the folding portion 64 may be formed by folding the inner edge of the side seat 34 toward the outer side in the width direction. One or a plurality of three-dimensional gather elastic members 35 can be sandwiched and fixed to the folded-back portion 64 of the side seat 34.

One or a plurality of three-dimensional gather elastic members 35 are attached to the free portions 63a of the standing regions 63 of the pair of side seats 34, respectively. The three-dimensional gather elastic member 35 is fixed to the free portion 63a of the side seat 34 in an extended state along the longitudinal direction. Specifically, it is preferable that the three-dimensional gather elastic member 35 is fixed by being sandwiched between the folded portions 64 formed in the free portion 63 a of the side seat 34. In this manner, since the three-dimensional gather elastic members 35 are fixed in the stretched state, when the three-dimensional gather elastic members 35 contract, the free portion 63a of the side seat 34 contracts in the longitudinal direction. As a result, the free portion 63 a of the side sheet 34 is erected so as to be separated from the skin-facing surface of the top sheet 32 using the contracting force of the three-dimensional gather elastic member 35. When the three-dimensional gather elastic member 35 contracts, a wrinkle (gather) is formed on the free portion 63a of the side seat 34 which fixes the three-dimensional gather elastic member 35. Therefore, the free portion 63a of the side seat 34 forms a three-dimensional gather that stands up toward the wearer's skin. When fixing the three-dimensional gather elastic member 35 to the side sheet 34, an adhesive may be directly applied to the three-dimensional gather elastic member 35 and fixed to the side sheet 34 in the stretched state. Further, after applying the adhesive to the side sheet 34, the stretched three-dimensional gather elastic member 35 may be attached to the side sheet 34. One, two, or three or more three-dimensional gather elastic members 35 can be provided for each side sheet 34.

Here, as shown in FIG. 5, the three-dimensional gather elastic member 35 includes a central portion 35C, a front end portion 35F located on the front side in the longitudinal direction of the central portion 35C, and a rear portion located on the rear side in the longitudinal direction of the central portion 35C. It has an end portion 35R. In this case, when the three-dimensional gather elastic member 35 is fixed to the side seats 34, the expansion rate at the central portion 35C is different from that at the front end portion 35F and/or the rear end portion 35R. It is preferable. The extension rate in the central portion 35C may be different from the extension rate of both the front end portion 35F and the rear end portion 35R, or different from the extension rate of either one of the front end portion 35F and the rear end portion 35R, and either May be the same as the elongation rate of. In the present invention, it is preferable that the extension rate of the central portion 35C is different from the extension rates of both the front end portion 35F and the rear end portion 35R, and the extension rates of the front end portion 35F and the rear end portion 35R are substantially the same. ..

More specifically, in the three-dimensional gather elastic member 35, it is preferable that the extension rates of the front and rear end portions 35F and 35R be higher than the extension rate of the central portion 35C. For example, the extension ratios at the front and rear end portions 35F and 35R are preferably 1.1 times to 3 times, 1.2 times to 2.5 times, or 1. It is preferably 5 to 2 times. However, it is preferable that the extension rate in each part (35C, 35F, 35R) of the three-dimensional gather elastic member 35 is in the range of 260% to 410%, 280% to 370%, or 310% to 340%. The expansion rate of at least a part of the front and rear end portions 35F and 35R may be set higher than the expansion rate of at least a part of the central portion 35C, and the expansion rate of the entire front and rear end portions 35F and 35R is not necessarily required. However, it does not need to be set higher than the expansion rate of the entire central portion 35C. However, in the preferred embodiment, the overall expansion rate of the front and rear end portions 35F and 35R is higher than the overall expansion rate of the central portion 35C. When measuring the expansion ratio of the three-dimensional gather elastic member 35, the side sheet 34 to which the three-dimensional gather elastic member 35 is fixed is completely stretched in the longitudinal direction. Specifically, with the side sheet 34 completely extended in the longitudinal direction, each part (35C, 35F, 35R) of the three-dimensional gather elastic member 35 is cut by a predetermined length α (eg, α=30 mm). Then, the elongation rate (α/β) is determined by comparing the length β of the cut pieces in the natural state (contracted state) with the predetermined length α.

In this way, by partially adjusting the expansion rate of the three-dimensional gather elastic member 35 forming the three-dimensional gather, the rising performance and the adhesion performance of the three-dimensional gather can be appropriately adjusted according to the type and size of the disposable diaper. it can. For example, the extension rate of the three-dimensional gather elastic member 35 may be increased in a region where urine leakage easily occurs. In particular, the expansion rate at the front and rear end portions 35F and 35R of the three-dimensional gather elastic member 35 is increased. Generally, since the three-dimensional gathers are easily separated from the wearer's skin in the front and rear portions in the longitudinal direction, by increasing the extension rate of the three-dimensional gather elastic member 35 in this portion, the three-dimensional gathers are easily attached to the skin. Urine leakage can be effectively prevented.

Further, as shown in the cross-sectional view of FIG. 6, the absorbent main body 30 may further include a cover sheet 37 that covers the non-skin-facing surface side of the back sheet 33. The cover sheet 37 is a member that reinforces the back sheet 33 and improves the feel thereof. A woven fabric or a non-woven fabric is used as a material forming the cover sheet 37. In particular, as the material forming the cover sheet 37, it is preferable to use a nonwoven fabric or a wet nonwoven fabric made of a thermoplastic resin such as polyethylene, polypropylene or polyester.

As described above, in order to express the content of the present invention, the embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and includes modifications and improvements that are obvious to those skilled in the art based on the matters described in the present specification.

INDUSTRIAL APPLICABILITY The present invention can be suitably used in the manufacturing industry of disposable diapers and the like.

1... front body 2... back body 3... crotch 4... waist opening 5... leg opening 10... front body exterior body 20... back body exterior body 30... absorbent body 31... absorber 32... top sheet 33... back Seat 34... Side seat 35... Three-dimensional gather elastic member 35C... Central part 35F... Front end part 35R... Rear end part 36... Leg elastic member 37... Cover seat 40... Cushion part 41... Inner seat 42... Outer seat 43... Waist elastic member 43C... central part 43L... left side part 43R... right side part 44... cushion forming sheet 45... inner sheet 46... Tammy elastic member 51... joining part 52... non-joining part 61... joining line 62... joining region 63... standing region 63a ... Free part 63b... Joined part 63c... Joined part 64... Folding part 100... Disposable diaper

Claims (3)

A disposable diaper longitudinally divided into a front body (1), a back body (2), and a crotch portion (3) located between the front body (1) and the back body (2),
A cushion part (40) is formed on both or one of the front body (1) and the back body (2),
The cushion part (40) is
A plurality of elastic stretchable members (43) which are fixed in an elongated state along the width direction of the disposable diaper at intervals in the longitudinal direction;
An inner sheet (41),
An outer sheet (42) located on the non-skin facing side of the inner sheet (41),
The joint portion (51) and the non-joint portion (52) extending in the longitudinal direction are alternately continuous to the inner sheet (41) and/or the outer sheet (42) along the width direction. A cushion-forming sheet (44) joined intermittently so that
The resilient and elastic members (43) are sandwiched by and fixed between the said inner sheet (41) under tension along the width direction outer sheet (42),
In the elastic stretchable member (43), when the body is completely stretched in the width direction , at least the right or left side portion (43L, 43R) in the width direction has an extension rate at the center portion in the width direction (43L, 43R). 43C), which is higher than the elongation rate in
The widthwise interval between the joint portions (51) in the side portions (43L, 43R) is wider than the widthwise distance between the joint portions (51) in the central portion (43C). An absorbent main body (30) provided in the longitudinal direction from the crotch part (3) to the front body (1) and the back body (2),
The absorbent body (30) is
An absorber (31),
A top sheet (32) arranged on the skin facing surface side of the absorber ( 31 ),
A back sheet (33) disposed on the skin non-opposing surface side of the absorber ( 31 ),
A pair of side sheets (34) disposed on the left and right sides of the skin-facing surface side of the top sheet (32);
The side seat (34) is
A joining line (61) extending along the longitudinal direction,
A joining region (62) joined to the skin-facing surface of the top sheet (32) outside the joining line (61) in the width direction,
A standing area (63) inside the joining line (61) in the width direction,
At least a part of the standing region (63) is a free part (63a) not joined to the topsheet (32),
One or a plurality of three-dimensional gather elastic members (35) are fixed to the free portion (63a) in an elongated state along the longitudinal direction,
The three-dimensional gather elastic member (35) has an extension rate at a central portion (35C) in the longitudinal direction and at least one of front and rear end portions in the longitudinal direction in a state where the side seat (34) is completely extended in the longitudinal direction. The disposable diaper according to claim 1, wherein the expansion rates in (35F, 35R) are different. The disposable diaper according to claim 2, wherein the three-dimensional gather elastic member (35) has a higher extension rate at the end portions (35F, 35R) than at the center portion (35C).

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