Patent Application
20150297426
The present invention relates to a disposable diaper.
Conventionally, there is known a disposable diaper having; a front waistline region; a back waistline region; and a crotch region which is positioned between the front waistline region and the back waistline region, a pair of leg-hole opening units being formed therein, the disposable diaper being provided with an absorber running across the crotch region and extending to the front waistline region and the back waistline region.
Here, in Patent Literature 1, there is described the disposable diaper as mentioned above, in which a fastening tape is composed of a transparent film, and when the disposable diaper as mentioned above is worn by a wearer, the disposable diaper is structured so that a wearing assistant can visually recognize a target tape (refer to Patent Literature 1).
[PTL 1]Japanese Unexamined Patent Application Publication No. H05-507753
Here, a structure of the fastening tape in the disposable diaper as mentioned above (a structure which is capable of visually recognizing a target tape) is formed with the emphasis on usability.
On the other hand, in recent years, there has been a growing demand from users (purchasers) for disposable diapers, and in particular, there has been a growing desire from the users to reduce a burden on a skin of an infant as much as possible.
However, in the disposable diaper as mentioned above, the fastening tape imparts a large sense of discomfort in texture or appearance in comparison with another portion of the disposable diaper that is formed of a nonwoven cloth, and for users who have a growing demand or desire for disposable diapers, there has been a problem that it is mistakenly recognized that the fastening tape is a foreign matter.
Accordingly, the present invention has been made in view of such a circumstance, and it is an object of the present invention to provide a disposable diaper which is capable of imparting an impression that a visual sense of integrity is felt between the fastening tape and another portion which is formed of a nonwoven cloth.
A first characteristic of the present invention is summarized as a disposable diaper having; a front waistline region; a back waistline region; and a crotch region which is positioned between the front waistline region and the back waistline region, the disposable diaper comprising an absorber running across the crotch region and extending to the front waistline region and the back waistline region, and the disposable diaper having; a product longitudinal direction which is oriented from the front waistline region to the back waistline region and a product widthwise direction which is orthogonal to the product longitudinal direction, wherein a pair of fastening tapes are provided so as to extend from both side edges of the disposable diaper in either the front waistline region or the back waistline region to an outside in the product widthwise direction, wherein the fastening tapes each are composed of a plurality of nonwoven cloth sheets, wherein embossment is provided at a first nonwoven cloth sheet which is provided at a most non-skin contact surface side of a respective one of nonwoven cloth sheets which correspond to a joint region in which the fastening tapes are joined in both of the side edges, and
[
[
[
[
With reference to
It is noted that, in the description of the drawings below, identical or similar symbols are assigned to identical or similar portions. However, it should be noted that the drawings are schematic and ratios of respective dimensions and the like are different from actual ones.
Therefore, a specific dimension and the like should be determined in view of the following description. Moreover, among the drawings, the respective dimensional relations or ratios may differ.
It is to be noted that although explanation is made citing a tape-type disposable diaper 10 as an example in the present embodiment, the present invention is also applicable to a pant-type disposable diaper 10.
As illustrated in
Here, the front waistline region 20 is the portion that is in contact with the front waistline portion of the wearer, the back waistline region 30 is the portion that is in contact with a back waistline portion of the wearer, and the crotch region 25 is the portion that positioned between the front waistline region 20 and the back waistline region 30.
In the present embodiment, the direction from the front waistline region 20 towards the back waistline region 30 is called the product longitudinal direction L, and the direction perpendicular to the product longitudinal direction L is called the product widthwise direction W.
The disposable diaper 10 according to present embodiment includes an absorber 40 spanning the crotch region 25 and extending toward at the front waistline region 20 and the back waistline region 30. The absorber 40 is configured by an absorbent core and a core wrap.
The absorber core is same as in the conventional disposable diaper, and can be configured appropriately by using popular components and materials, such as ground pulp and high absorbent polymer. The absorber core is wrapped by the sheet-like core wrap. p The core wrap is a sheet for wrapping the absorber core. A part of at least the skin surface contact side of the core wrap is configured by various fibrous nonwoven fabrics or a tissue sheet having liquid-permeability.
For example, an air-through fibrous nonwoven cloth, a spunbond nonwoven cloth, or an SMS (spunbond-meltblown-spunbond) nonwoven cloth having a mass of approximately 10 to 30 g/m2, or a tissue sheet having a mass of approximately 10 to 30 g/m2 can be used as the component configuring the core wrap.
Further, as shown in
For example, the leg stretching units 75 each may be composed of a predetermined number of elastic members (two elastic members in the example of
Also, a topsheet (not shown) which is a transparent nonwoven cloth sheet is provided at a surface side (a skin contact surface side) of an absorber 40, and a backsheet 60 which is composed of a nonwoven cloth sheet is provided at a back face side (a non-skin contact surface side) of the absorber 40.
Furthermore, a liquid-impermeable leakage preventing sheet (not shown) is provided between the topsheet 50 and the backsheet 60.
A side flap 70 is provided at both side edges in the product widthwise direction W of the absorber 40. The side flaps 70 are made of one or two or more pieces of nonwoven fabrics overlapping one another.
Also, as shown in
In addition, the disposable diaper 10 according to the embodiment is provided with a target tape 90B in a predetermined region of the non-skin contact surface side of the back waistline region 30 (or the front waistline region 20).
Here, as shown in
Here, the fastening tape 90 is composed of a plurality of nonwoven cloth sheets. As shown in
In addition, as shown in
On the other hand, as shown in
It is to be noted that the same shapes of embossment denotes that patterns which is formed of embossments 60a and 91a or dimensions which constitute the patterns (such as areas of the respective lattices) are the same as each other.
It is also to be noted that the similar shapes of embossment denotes that, although the patterns formed of embossment 60a and embossment 91a are the same as each other, dimensions of shapes which constitute the patterns are different from each other or either width or height is stretched or shrunk while the shapes (For example, a triangle or a square) are maintained.
Alternatively, the backsheet (the first nonwoven cloth sheet) and the nonwoven cloth sheet 91 may be composed of a nonwoven cloth which is generated by a same kind of manufacturing method.
In addition, as shown in
Further, as shown in
Furthermore, it is preferable that a value of KES bending rigidity per unit length in the product longitudinal direction L all over the fastening tape 90 and a value of KES bending rigidity per unit length in the product widthwise direction W all over the fastening tape 90 each are adapted to be smaller than 1.45 gf·cm2/cm.
The flexural properties were measured by using KES-FB2 manufactured by KATO TECH CO., LTD., by fixing each sample (such each sample obtained by cutting out the fastening tape 90 together with the nonwoven cloth sheets 91 and 92) between the chucks (while facing down the skin contact surface side (the inside) of the fastening tape 90 in the disposable diaper 10), bending to the front up to maximum curvature +2.5 cm −1, and then bending to the back up to maximum curvature −2.5 cm −1, and then returning to the origin.
The value of KES bending rigidity can be set to be smaller than 1.45 gf·cm2/cm by employing a plurality of nonwoven cloth sheets which constitute the fastening tapes 90 or by controlling types of the respective nonwoven cloth sheets or embossment rate forming a pattern or the like.
Further, at the target tape 90B, there may be provided embossment having a similar shape to that of the embossment 91a that is provided at a respective one of the backsheet (the first nonwoven cloth sheet) and the nonwoven cloth sheet 91.
Here, each nonwoven cloth sheet is formed by laminating single-layered fibers, more preferably by laminating multi-layered fibers.
The target tape 90B is composed of a plurality of nonwoven cloth sheets like the fastening tapes 90 or the backsheet 60.
In this manner, at the time of wearing the disposable diaper 10, when the fastening tape 90 is mounted to the target tape 90B, a visually integrated pattern is formed all over the front waistline region 20 and the back waistline region 30, making it possible to impart a good impression that any element as a foreign matter is not present.
Namely, nonwoven cloth sheets which constitute the target tapes 90B are formed by laminating multi-layered fibers, whereby the durability and engagement property that are required for the target tape 90B are easily achieved while embossment of a same or similar shape are provided.
It is to be noted that, in a case where the exterior sheet is provided at the non-skin contact surface side of the backsheet 60, the first nonwoven cloth sheet that is provided at the most non-skin contact surface side of a respective one of the nonwoven cloth sheets that correspond to the joint region 100 is obtained as the exterior sheet in place of the backsheet 60.
In so far as the disposable diaper 10 according to the embodiment is concerned, the embossment 91a having a same as or a similar shape to that of the embossment 60a that is provided at the backsheet 60 (the first nonwoven cloth sheet) is provided at the nonwoven cloth sheet 91 that is provided at a respective one of the most non-skin contact surface side of the respective one of the nonwoven cloth sheets 91 and 92 that constitute the fastening tapes 90, thus making it possible to impart an impression that a visual sense of integrity is felt between a respective one of the fastening tapes 90 and the backsheet 60 (or the exterior sheet).
Also, the fastening tapes 90 each, as shown in
According to the structure as mentioned above, the fastening tapes 90 are not released out to the non-skin contact surface side of the backsheet 60; and therefore, an impression of a visual sense of integrity all over the front waistline region 20 and the back waistline region 30 is improved more remarkably.
In addition, it is preferable that nonwoven parts of the non-skin contact surface sides of the backsheets 60 and the fastening tapes 90 be composed of a crimped texture.
It is preferable that it be constituted by employing a crimped fiber. As the crimped fiber, for example, there can be employed a fiber obtained by employing a heat shrink crimping approach. In a case where the heat shrink crimping approach is employed, a composite fiber according to a side-by-side type or a core-clad type made of polypropylene and polyethylene, for example, is spun, and then crimping can be developed by a heat shrink difference due to a difference in the melting point.
In particular, it is preferable to employ a composite fiber which is obtained by a heat shrink crimping approach according to an eccentric core-clad type while polypropylene is employed as a core and copolymer of ethylene/propylene is employed as a clad, since a desired crimping count, a crimping rate, a crimping and stretching rate, a crimping and restoring rate or the like can be adjusted.
By employing such a crimped fiber, the bulkiness of the fiber is easily developed, and an image which is closer to a cloth (in particular, a kilting-like cloth in the embodiment) can be exhibited. In addition, together with embossment, an image which is further closer to a cloth (a kilting-like cloth) can be exhibited.
As described above, the present invention has been described in detail by using the above-described embodiment. However, it is apparent to those skilled in the art that the present invention is not limited to the embodiment described in this description. The present invention can be modified and changed without departing from the gist and the scope of the present invention defined by the appended claims. Therefore, the description is aimed at illustration and explanation of the present invention, and does not have any meaning which limits the present invention.
It is to be noted that all the contents of Japanese Patent Application No. 2012-259164 (which was filed in Nov. 27, 2012) are incorporated in the present specification by reference.
It is possible to provide a disposable diaper which is capable of imparting an impression that a visual sense of integrity is felt between a respective one of fastening tapes and another portion which is formed of a nonwoven cloth.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2012-259164 | Nov 2012 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2013/081859 | 11/27/2013 | WO | 00 |
