Absorbent article and method for manufacturing absorbent article
阅读说明:本技术 吸收性物品和吸收性物品的制造方法 (Absorbent article and method for manufacturing absorbent article ) 是由 藤井敬司 植田麻穗 于 2018-04-05 设计创作,主要内容包括:一种吸收性物品(1),其设置有腰身部(2),其中腰身部(2)在厚度方向上设置有皮肤侧无纺布(21、31)和非皮肤侧无纺布(22、32),贯通皮肤侧无纺布(21、31)的皮肤侧孔(41)与贯通非皮肤侧无纺布(22、32)的非皮肤侧孔(42)连通,皮肤侧无纺布(21、31)在皮肤侧孔(41)的边缘部设置有朝向非皮肤侧突出的突出部(43),突出部(43)在厚度方向上与非皮肤侧无纺布(22、32)的至少一部分重叠。(An absorbent article (1) provided with a waist part (2), wherein the waist part (2) is provided with skin-side nonwoven fabrics (21, 31) and non-skin-side nonwoven fabrics (22, 32) in the thickness direction, skin-side holes (41) penetrating the skin-side nonwoven fabrics (21, 31) communicate with non-skin-side holes (42) penetrating the non-skin-side nonwoven fabrics (22, 32), the skin-side nonwoven fabrics (21, 31) are provided with protruding parts (43) protruding toward the non-skin side at the edge parts of the skin-side holes (41), and the protruding parts (43) overlap with at least a part of the non-skin-side nonwoven fabrics (22, 32) in the thickness direction.)
1. An absorbent article, comprising:
a waist portion configured to contact a waist of a wearer,
the waistline portion includes:
a skin-side nonwoven fabric sheet disposed on the skin side in the thickness direction of the waist portion,
the skin side is the side that is against the skin of the wearer; and
a non-skin side nonwoven fabric sheet disposed on the non-skin side in the thickness direction with respect to the skin side nonwoven fabric sheet,
the non-skin side is the side that is not against the skin of the wearer,
the skin side nonwoven fabric sheet has a skin side hole penetrating the skin side nonwoven fabric sheet,
the non-skin side nonwoven fabric sheet has non-skin side holes penetrating the non-skin side nonwoven fabric sheet,
the skin side apertures are in communication with the non-skin side apertures,
the skin-side nonwoven fabric sheet includes a protruding portion at an edge of the skin-side hole, the protruding portion protruding toward the non-skin side,
the protruding portion overlaps at least a part of the non-skin side nonwoven fabric sheet in the thickness direction.
2. The absorbent article of claim 1,
the protruding portion does not protrude on the non-skin side surface of the non-skin side nonwoven fabric sheet in the thickness direction from the non-skin side surface.
3. The absorbent article according to claim 1 or 2, wherein,
the non-skin-side nonwoven fabric sheet includes a second protruding portion at an edge of the non-skin-side hole, the second protruding portion protruding toward the non-skin-side hole and protruding toward the non-skin-side hole
The length in the thickness direction from the non-skin-side surface of the non-skin-side nonwoven sheet to the highest point of the second protruding portion is shorter than the length in the thickness direction from the non-skin-side surface of the skin-side nonwoven sheet to the highest point of the protruding portion.
4. The absorbent article according to any one of claims 1 to 3, wherein,
the diameter of the fibers constituting the non-skin side nonwoven fabric sheet is larger than the diameter of the fibers constituting the skin side nonwoven fabric sheet.
5. The absorbent article according to any one of claims 1 to 4, wherein,
the melting point of the fibers constituting the non-skin side nonwoven fabric sheet is higher than the melting point of the fibers constituting the skin side nonwoven fabric sheet.
6. The absorbent article according to any one of claims 1 to 5, wherein,
the waistline portion includes a plurality of thread-like elastic members which are arranged side by side in a predetermined direction and are positioned between the skin-side nonwoven fabric sheet and the non-skin-side nonwoven fabric sheet,
the skin-side hole and the non-skin-side hole are formed between a plurality of linear elastic members arranged side by side in the predetermined direction, and
the skin-side nonwoven fabric sheet and the non-skin-side nonwoven fabric sheet are bonded together with an adhesive by the thread-like elastic member.
7. A method for manufacturing an absorbent article having a plurality of absorbent layers,
the absorbent article includes a waist portion configured to contact a waist of a wearer,
the waistline portion includes:
a skin-side nonwoven fabric sheet disposed on the skin side in the thickness direction of the waist portion,
the skin side is the side that is against the skin of the wearer; and
a non-skin side nonwoven fabric sheet disposed on the non-skin side in the thickness direction with respect to the skin side nonwoven fabric sheet,
the non-skin side is the side that is not against the skin of the wearer,
the method comprises the following steps:
a step of forming a non-skin side hole in the non-skin side nonwoven sheet by pushing a pin through the non-skin side nonwoven sheet from a non-skin side surface of the non-skin side nonwoven sheet in the thickness direction,
the pins are heated to a temperature lower than the melting point of the fibers constituting the skin-side nonwoven sheet and the melting point of the fibers constituting the non-skin-side nonwoven sheet;
a step of forming a skin side hole in the skin side nonwoven sheet by pushing a pin through the skin side nonwoven sheet from a non-skin side surface of the skin side nonwoven sheet in the thickness direction,
the pins are in a state of penetrating the non-skin side non-woven fabric sheet; and
a step of forming a protruding portion in an edge portion of the skin-side hole of the skin-side nonwoven fabric sheet by withdrawing the pin from the skin-side nonwoven fabric sheet toward the non-skin-side nonwoven fabric sheet,
the protruding portion is a portion protruding toward the non-skin side,
the protruding portion overlaps at least a part of the non-skin side nonwoven fabric sheet in the thickness direction.
Technical Field
The present invention relates to an absorbent article and a method for manufacturing the absorbent article.
Background
One known example of an absorbent article is a pants-type disposable diaper. Patent document 1 discloses a pants-type disposable diaper having a stretchable sheet composed of a first sheet provided with holes, a second sheet, and a plurality of elastic members arranged between the first sheet and the second sheet, and the stretchable sheet is used as a waist belt member. The breathability of the diaper is improved by the apertures provided in the first panel.
Disclosure of Invention
Problems to be solved by the invention
However, the nonwoven fabric sheet typically used in the belt member is composed of entangled fibers. Thus, the hole tends to close. In view of this, the shape of the hole is more easily maintained by piercing the nonwoven fabric sheet with the heated pin to form the hole. However, since the heated pin is pushed through and then withdrawn, the fibers present in the hole portions form protrusions. The protruding fibers harden due to heat, and thus there is a risk of irritation to the wearer's skin.
The present invention has been made in view of the conventional problems such as described above, and it is an aspect of the present invention to provide an absorbent article in which the shape of the hole formed in the waistline portion is maintained and irritation to the wearer's skin is suppressed, and a method of manufacturing such an absorbent article.
Means for solving the problems
A main aspect of the present invention for achieving the above-described aspect is an absorbent article including: a waistline portion configured to contact a waistline of a wearer, the waistline portion comprising: a skin-side nonwoven fabric sheet disposed on the skin side in the thickness direction of the waist portion, the skin side being the side that is closer to the skin of the wearer; and a non-skin-side nonwoven fabric sheet disposed on a non-skin side in a thickness direction with respect to the skin-side nonwoven fabric sheet, the non-skin side being a side not to be exposed to the skin of a wearer, the skin-side nonwoven fabric sheet having a skin-side hole penetrating through the skin-side nonwoven fabric sheet, the non-skin-side nonwoven fabric sheet having a non-skin-side hole penetrating through the non-skin-side nonwoven fabric sheet, the skin-side hole communicating with the non-skin-side hole, the skin-side nonwoven fabric sheet including a protruding portion at an edge portion of the skin-side hole, the protruding portion being a portion protruding toward the non-skin side, the protruding portion overlapping with at least a portion of the non-skin-side nonwoven fabric sheet in the thickness direction.
Features of the present invention other than the above will become apparent from the description of the present specification with reference to the accompanying drawings.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is possible to provide an absorbent article in which irritation to the skin of a wearer is suppressed while maintaining the shape of a hole formed in a waistline portion, and a method of manufacturing such an absorbent article.
Drawings
Fig. 1 is a schematic perspective view of a pants-type disposable diaper 1.
Fig. 2 is a schematic plan view of the diaper 1 in an unfolded and stretched state as viewed from the skin side.
Fig. 3 is a schematic sectional view taken along line a-a in fig. 2.
Fig. 4 is a schematic side view of a
Fig. 5 is a cross-sectional explanatory view of the
Fig. 6 is a sectional explanatory view of a step for forming the
Fig. 7 is a cross-sectional explanatory view of the
Detailed Description
At least the following matters will become clear from the description of the present specification and the accompanying drawings.
An absorbent article, comprising: a waistline portion configured to contact a waistline of a wearer, the waistline portion comprising: a skin-side nonwoven fabric sheet disposed on the skin side in the thickness direction of the waist portion, the skin side being the side that is closer to the skin of the wearer; and a non-skin-side nonwoven fabric sheet disposed on a non-skin side in a thickness direction with respect to the skin-side nonwoven fabric sheet, the non-skin side being a side not to be exposed to the skin of a wearer, the skin-side nonwoven fabric sheet having a skin-side hole penetrating through the skin-side nonwoven fabric sheet, the non-skin-side nonwoven fabric sheet having a non-skin-side hole penetrating through the non-skin-side nonwoven fabric sheet, the skin-side hole communicating with the non-skin-side hole, the skin-side nonwoven fabric sheet including a protruding portion at an edge portion of the skin-side hole, the protruding portion being a portion protruding toward the non-skin side, the protruding portion overlapping with at least a portion of the non-skin-side nonwoven fabric sheet in the thickness direction.
According to the absorbent article, the protrusions can be prevented from irritating the skin of the wearer. Further, the skin-side holes and the non-skin-side holes are easily maintained in their shapes by the projecting portions extending toward the non-skin-side nonwoven fabric sheet. Thus, improvement in air permeability and visibility of the holes is achieved.
In this absorbent article, the protruding portion does not protrude on the non-skin side surface of the non-skin side nonwoven fabric sheet in the thickness direction from the non-skin side surface.
According to the absorbent article, the skin of the child care provider or the skin of the caregiver can be prevented from being irritated by the protrusions.
In this absorbent article, the non-skin side nonwoven sheet includes a second protruding portion at an edge portion of the non-skin side hole, the second protruding portion protruding toward the non-skin side, and a length in a thickness direction from a non-skin side surface of the non-skin side nonwoven sheet to a highest point of the second protruding portion is shorter than a length in the thickness direction from the non-skin side surface of the skin side nonwoven sheet to the highest point of the protruding portion.
According to this absorbent article, the length of the protruding portion is set to be long so that the skin side hole and the non-skin side hole can maintain their shapes, and also the skin of the child care provider or the skin of the caregiver can be suppressed from being irritated by the second protruding portion.
In this absorbent article, the diameter of the fibers constituting the non-skin side nonwoven fabric sheet is larger than the diameter of the fibers constituting the skin side nonwoven fabric sheet.
According to this absorbent article, the length of the protruding portion in the thickness direction can be set longer than the length of the second protruding portion in the thickness direction.
In this absorbent article, the melting point of the fibers constituting the non-skin side nonwoven fabric sheet is higher than the melting point of the fibers constituting the skin side nonwoven fabric sheet.
According to this absorbent article, the length of the protruding portion in the thickness direction can be set longer than the length of the second protruding portion in the thickness direction.
In this absorbent article, the waistline portion includes a plurality of thread-like elastic members which are arranged side by side in a predetermined direction and are positioned between the skin-side nonwoven fabric sheet and the non-skin-side nonwoven fabric sheet, the skin-side holes and the non-skin-side holes are formed between the plurality of thread-like elastic members which are arranged side by side in the predetermined direction, and the skin-side nonwoven fabric sheet and the non-skin-side nonwoven fabric sheet are bonded together by the thread-like elastic members with an adhesive.
According to this absorbent article, the adhesive is not provided at the edge portions of the skin-side holes and the non-skin-side holes, and thus the curing of the adhesive can be prevented from being accompanied by the curing of the fibers at the edge portions. Therefore, the edge portions of the skin-side holes and the non-skin-side holes can be made as soft as possible, and irritation to the skin of the wearer and the like can be suppressed.
Further, a method of manufacturing an absorbent article including a waistline portion configured to be brought into contact with a waistline of a wearer, the waistline portion including: a skin-side nonwoven fabric sheet disposed on the skin side in the thickness direction of the waist portion, the skin side being the side that is closer to the skin of the wearer; and a non-skin side nonwoven fabric sheet disposed on a non-skin side in a thickness direction with respect to the skin side nonwoven fabric sheet, the non-skin side being a side not to be close to the skin of the wearer, the method comprising: a step of forming a non-skin side hole in the non-skin side nonwoven sheet by pushing a pin, which is heated to a temperature lower than a melting point of a fiber constituting the skin side nonwoven sheet and a melting point of a fiber constituting the non-skin side nonwoven sheet, through the non-skin side nonwoven sheet from a non-skin side surface of the non-skin side nonwoven sheet in the thickness direction; a step of forming a skin-side hole in the skin-side nonwoven sheet by pushing a pin, which is in a state of penetrating the non-skin-side nonwoven sheet, from a non-skin-side surface of the skin-side nonwoven sheet in the thickness direction through the skin-side nonwoven sheet; and forming a protruding portion in an edge portion of the skin-side hole of the skin-side nonwoven fabric sheet by retracting the pin from the skin-side nonwoven fabric sheet toward the non-skin-side nonwoven fabric sheet, the protruding portion being a portion protruding toward the non-skin-side, the protruding portion overlapping at least a portion of the non-skin-side nonwoven fabric sheet in the thickness direction.
According to this method for manufacturing an absorbent article, it is possible to manufacture an absorbent article in which the skin of the wearer is inhibited from being irritated by the protrusions, and in which the shapes of the skin-side holes and the non-skin-side holes are maintained by the protrusions extending toward the non-skin-side nonwoven fabric sheet.
Embodiments of the present invention are described in detail below with reference to the accompanying drawings
Next, an embodiment of the absorbent article according to the present invention will be described taking a pants-type disposable diaper for infants as an example. It should be noted that the absorbent article according to the present invention is not limited to this example, and can also be applied to an adult-use disposable diaper, a panty-shaped sanitary napkin, a belt-type disposable diaper attached to a wearer by a hook belt, or the like.
< < Structure of pants-type Disposable diaper 1> >)
Fig. 1 is a schematic perspective view of a pants-type disposable diaper 1 (hereinafter referred to as "diaper") according to the present embodiment. Fig. 2 is a schematic plan view of the diaper 1 in an unfolded and extended state as viewed from the skin side. Fig. 3 is a schematic sectional view taken along line a-a in fig. 2.
The diaper 1 comprises three rectangular members: an absorbent
The diaper 1 has a longitudinal direction, a transverse direction and a thickness direction. With respect to the thickness direction, the side that is in contact with the wearer will be referred to as the skin side, and the side that is not in contact with the wearer will be referred to as the non-skin side.
In the diaper 1 in the developed state shown in fig. 2, the lateral center portion of the abdomen-
In this example, the absorbent
As shown in fig. 3, the ventral portion 20 (dorsal portion 30) includes: a skin-side nonwoven fabric sheet 21(31) disposed on the skin side in the thickness direction; a non-skin side nonwoven fabric sheet 22(32) disposed on the non-skin side of the skin side nonwoven fabric sheet 21; a linear elastic member 23 (33); and a cover nonwoven fabric sheet 24 (34). The skin-side nonwoven fabric sheets 21 and 31 and the non-skin-side nonwoven fabric sheets 22 and 32 are disposed on the non-skin side with respect to the absorbent
The skin-side nonwoven fabric sheets 21 and 31, the non-skin-side nonwoven fabric sheets 22 and 32, and the cover
The linear elastic members 23(33) are arranged side by side in the longitudinal direction between the skin-side nonwoven fabric sheets 21(31) and the non-skin-side nonwoven fabric sheets 22(32), and are fixed therebetween in a state of being stretched in the transverse direction. This imparts stretchability to the
The abdomen-side portion 20 (back-side portion 30) is provided with
< method for producing
Fig. 4 is a schematic side view of a
The
The outer circumferential surface of the
First, the non-skin-side nonwoven fabric sheets 22 and 32 (continuous body) are wound up with their respective skin-
The skin-side nonwoven fabric sheets 21 and 31 (continuous bodies) are wound up with their respective skin-
The skin-side nonwoven fabric sheet 21(31) and the non-skin-side nonwoven fabric sheet 22(32) are pressed between the outer peripheral surface of the intermediate roller 52 (the portion between the pins 55) and the outer peripheral surface of the downstream roller 53 (the portion between the recesses 56) at a position where the
At this time, the
Thereafter, as the
Note that the
< < <
Fig. 5 is a cross-sectional explanatory view of the
The waist portion 2 (the stomach-
The skin side hole 41 communicates with the non-skin side hole 42. Specifically, the positions of the skin side holes 41 and the positions of the non-skin side holes 42 are aligned with each other when viewed from the thickness direction. This achieves good air permeability of the
In addition, in order to improve the texture of the
It should be noted that when the
In view of this, in the present embodiment, as shown in fig. 6 (B), when the
Therefore, as shown in fig. 5, the skin-side nonwoven fabric sheets 21 and 31 of the present embodiment include a protruding
Further, the protruding
In addition, in the diaper 1 in a natural state (for example, when the diaper 1 is not put on), the
In particular, in the present embodiment, the non-skin side nonwoven fabric sheets 22 and 32 are less likely to melt than the skin side nonwoven fabric sheets 21 and 31 (which will be described in detail later). In this case, the non-skin side holes 42 are more easily closed and more easily collapsed when the
In addition, if holes are formed in a multi-layer (here, two layers) nonwoven fabric sheet as in the present embodiment, the holes are liable to become misaligned (misaligned), contrary to the case where holes are formed in a single-layer nonwoven fabric sheet. If such misalignment occurs, the air permeability will be lower than if the positions of the apertures were aligned in multiple layers, and the visibility of the apertures will also be reduced.
In order to solve this problem, in the present embodiment, the protruding
In the
Note that there is no limitation to the above configuration, and such a configuration is also possible: the
In addition, it is preferable that, as shown in fig. 5, the protruding
According to this configuration, for example, the skin-side nonwoven fabric sheets 21 and 31 can be inhibited from being irritated by the
In addition, when the diaper 1 is used for an infant, a child-care provider (child-care) who purchases the diaper 1 does not wear the diaper 1, and therefore does not easily feel a good texture on the skin side of the
Note that there is no limitation on the above-described configuration, and as illustrated in the modification of fig. 7, the protruding
In this case, the texture on the non-skin side is inferior to that in the case of the
In addition, it is preferable that the non-skin side hole 42 is also formed similarly to the skin side hole 41. As shown in fig. 6 (a) and 6 (C), the
As shown in fig. 5, it is preferable that the thickness direction length h2 from the non-skin-
The length h1 of the protruding
For this reason, it is preferable that the fibers constituting the non-skin side nonwoven fabric sheets 22 and 32 have a larger diameter than the fibers constituting the skin side nonwoven fabric sheets 21 and 32. In other words, it is preferable that heat is more easily conducted to the fibers constituting the skin-side nonwoven fabric sheets 21 and 31, and that heat is less easily conducted to the fibers constituting the non-skin-side nonwoven fabric sheets 22 and 32.
According to this configuration, in the skin-side nonwoven fabric sheets 21 and 31, many fibers around the
Specifically, in the nonwoven fabric produced by the meltblowing process (meltblowing process), the fiber diameter is small, and therefore an SMS nonwoven fabric (spunbond/meltblown/spunbond nonwoven fabric) can be used as the skin-side nonwoven fabric sheets 21 and 31, and a spunbond nonwoven fabric can be used as the non-skin-side nonwoven fabric sheets 22 and 32.
It is suggested to compare the fiber diameters using known methods. For example, the cross sections or the surfaces of the skin-side nonwoven fabric sheets 21 and 22 and the non-skin-side nonwoven fabric sheets 22 and 32 are observed for enlargement using an electron microscope. The diameter of the fiber in the magnified image is then measured. It is recommended to measure the diameter of a plurality of fibers and then compare the average values thereof. In addition, in the case of using a nonwoven fabric having a multilayer structure (e.g., SMS nonwoven fabric), the fiber diameter in the layer having the finest fibers is used as the fiber diameter of the nonwoven fabric.
In addition, it is acceptable that the melting point of the fibers constituting the non-skin side nonwoven fabric sheets 22 and 32 is higher than the melting point of the fibers constituting the skin side nonwoven fabric sheets 21 and 32. In other words, it is preferable that the skin-side nonwoven fabric sheets 21 and 31 are more easily melted, and the non-skin-side nonwoven fabric sheets 22 and 32 are less easily melted.
According to this configuration, in the skin-side nonwoven fabric sheets 21 and 31, many fibers around the
Specifically, for the skin-side nonwoven fabric sheets 21 and 31, a nonwoven fabric made of a material having a low melting point such as polyethylene or the like can be used. For the non-skin side nonwoven fabric sheets 22 and 32, a nonwoven fabric made of a material having a high melting point such as polypropylene or the like can be used.
It is recommended to compare the melting points using known methods. For example, it is suggested to obtain the melting points of the skin-side nonwoven fabric sheets 21 and 22 and the non-skin-side nonwoven fabric sheets 22 and 32 by using a Differential Scanning Calorimeter (DSC) for peak melting temperature measurement in accordance with JIS K7121 (test method for transition temperature of plastics), and then compare the melting points. In addition, in the case of using a nonwoven fabric having a multilayer structure (e.g., SMS nonwoven fabric), the melting point in the layer having the lowest melting point is used as the melting point of the nonwoven fabric.
In this way, in the present embodiment, the non-skin side nonwoven fabric sheets 22 and 32 are less likely to melt than the skin side nonwoven fabric sheets 21 and 31. For this reason, it is suggested that the
In addition, as shown in fig. 2, holes 40 (skin-side holes 41 and non-skin-side holes 42) are formed between the linear
In this case, no adhesive is provided at the edge portion of the
In addition, in manufacturing the
In addition, it is preferred that the
Although the embodiments of the present disclosure have been described above, the above embodiments of the present disclosure are only for convenience in understanding the present disclosure, and are not to be construed as limiting the present disclosure in any way. The present disclosure may be variously changed or modified without departing from the gist thereof and includes equivalent structures thereof. For example, variations to be described below are possible.
For example, the length of the second protruding
Description of the reference numerals
A pants-type disposable diaper (absorbent article) 1, a
10, an absorbent body, 11 an absorbent body,
20 ventral portion, 21 skin side nonwoven fabric sheet, 22 non-skin side nonwoven fabric sheet,
23 linear elastic members, 24 cover the nonwoven fabric sheet,
30 back side portion, 31 skin side nonwoven fabric sheet, 32 non-skin side nonwoven fabric sheet,
33 a thread-like elastic member, 34 a nonwoven fabric sheet,
40 holes, 41 skin side holes, 42 non-skin side holes,
43 protrusions, 44 second protrusions, 45 adhesive,
50 waistline unit, 51 upstream roll, 52 intermediate roll,
53 downstream rollers, 54 transport rollers, 55 pins, 56 recesses.
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