JP4204367B2 - Absorbent articles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorbent article such as a sanitary napkin, a panty liner, an incontinence pad, and a disposable diaper, and more particularly to an absorbent article that does not leak even when it is a bladeless type.
[0002]
[Prior art]
Various absorbent articles such as a sanitary napkin comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body positioned between the top sheet and the back sheet have been proposed and widely used. It is used.
Such sanitary napkins include, for example, a bladed type in which a pair of left and right wings are formed, and a bladeless type without the wings.
Conventionally proposed sanitary napkins have a problem that, when used for a long time, the user's movement causes misalignment and misalignment, resulting in leakage and soiling underwear. The bladeless type is “no blades”, so it does not rub, it is easy to use, and does not take much time to wear. On the other hand, it is more likely to cause misalignment and twisting due to “no blade fixing”. .
[0003]
Therefore, various sanitary napkins have been proposed that do not leak even when a gap or misalignment occurs. For example, Japanese Patent Application Laid-Open No. 2001-309944 (Patent Document 1) discloses a menstruation comprising a first absorbent member that is in close contact with a body and a second absorbent member that is positioned between the first absorbent member and underwear. A napkin has been proposed. Also, Japanese Patent Publication No. 2002-512849 (Patent Document 2) proposes a sanitary napkin in which a narrow absorbent material tube formed by covering an absorbent body with a liquid-permeable sheet on a top sheet is attached. Has been.
[0004]
[Patent Document 1]
JP 2001-309944 A (Claim 1, FIG. 1, etc.)
[Patent Document 2]
JP-T-2002-512849 (Claim 1, FIG. 1 etc.)
[0005]
[Problems to be solved by the invention]
All of the sanitary napkins of the above-mentioned patent documents are provided with a middle-high part on the napkin body, and the middle-high part is made to follow the movement of the user, thereby preventing displacement and twisting. Since the mid-high part absorbs body fluids, the wet mid-high part is in contact with the body during use, causing not only discomfort but also blurring due to stuffiness.
For this reason, development of the absorbent article which can prevent a shift | offset | difference, a twist, and does not produce discomfort, a swelling, etc., especially the absorbent article applicable to a bladeless type is desired.
[0006]
The present invention has been made by paying attention to the above-mentioned conventional problems, and has an ease of use of an absorbent article, particularly a sanitary napkin without a blade, which does not leak due to deviation or twisting. It is an object of the present invention to provide an absorbent article that is free from rashes and rubs and that is free from leakage due to misalignment.
[0007]
[Means for Solving the Problems]
In order to achieve this object, the invention of claim 1 has an absorbent property comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber positioned between the top sheet and the back sheet. In goods,
The body fluid guiding means provided on the top sheet for guiding the excreted body fluid to the absorber, and the body fluid guiding means following the user's movement and closely contacting the user's body fluid excretion part The follow-up / contact means comprises an elastic member having a hydrophilic portion and a hydrophobic portion fixed to a top sheet, and the body fluid guiding means is a hydrophilic member formed on the elastic member. It is an absorbent article characterized by comprising a part .
According to the invention of claim 1, both body fluid guiding performance and follow-up / adhesion performance are improved, and the discharged body fluid can be guided to the absorbent body and absorbed without being affected by deviation or twisting, thereby preventing leakage. can do.
[0008]
The invention according to claim 2 is the absorption according to claim 1, wherein the hydrophilic portion and the hydrophobic portion of the elastic member are each plate-like, and are superposed and bonded alternately so that the overall shape is a quadrangular prism shape. It is a sex product.
[0009]
The invention according to claim 3 is the absorbent article according to any one of claims 1 and 2, wherein the hydrophilic part of the elastic member is a polyurethane foam subjected to hydrophilic treatment, and the hydrophobic part is a polyurethane foam. .
[0010]
The invention according to claim 4 is the absorbent article according to any one of claims 1 to 3 , wherein the absorbent article is of a bladeless type.
According to the invention of claim 4 , the effect of being easy to mount and not sliding or rashing is obtained by the bladeless type.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a sanitary napkin 1 according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 to 3, the sanitary napkin 1 includes a liquid permeable top sheet 7, a liquid impermeable back sheet 3, and an absorbent body 5 positioned between the top sheet 7 and the back sheet 3. It consists of.
The sanitary napkin of the present embodiment is a so-called bladeless type, and the top sheet 7 and the back sheet 3 are bonded by hot melt, heat sealing or the like so as to surround the periphery of the absorbent body 5.
[0012]
Moreover, the absorber 5 is comprised by the absorption core 5a and the crepe paper 5b which wraps this.
On the back surface of the back sheet 3, a plurality of adhesive portions 3 b are provided by applying an adhesive usually used in this type of absorbent article in order to fix the sanitary napkin 1 to shorts. The backsheet 3 is made of a water shielding material such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on the water shielding material, and a waterproof plastic film interposed between the water shielding material and the nonwoven fabric. The laminated nonwoven fabric etc. which are formed are mentioned.
Examples of the material for the top sheet of the top sheet 7 include non-porous or perforated nonwoven fabrics and porous plastic sheets.
[0013]
The absorbent core 5a is formed by dispersing and mixing a highly water-absorbent resin in a water-absorbing fiber. Examples of the water-absorbing fiber include pulp, that is, cellulose fibers, and those made of artificial cellulose fibers such as rayon and acetate.
Furthermore, hydrophobic synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters, and polyamides may be used in combination.
Examples of the superabsorbent resin include cross-linked polyacrylate, self-crosslinked polyacrylate, saponified acrylate-vinyl acetate copolymer cross-linked, isobutyne / maleic anhydride copolymer cross-linked, polysulfonic acid Examples thereof include a partially cross-linked water-swellable polymer such as a salt cross-linked product, polyethylene oxide, and polyacrylamide. Of these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred.
[0014]
Then, the sanitary napkin 1 of this embodiment, provided on the top sheet 7, excreted body fluid (in this embodiment, menstrual blood) fluid conducting means for guiding to the absorber 5, and the Following / contact means for following the body fluid guiding means to the user's movement and bringing it into close contact with the user's body fluid excretion part (in this embodiment, the blood drainage port) is provided.
Specifically, the follow-up / contact means includes an elastic member 11 fixed to the top sheet 7, and the body fluid guiding means covers the elastic member 11 and is fixed to the top sheet 7. The cover sheet 21 is provided.
[0015]
The elastic member 11 is a quadrangular prism having a rectangular cross-sectional shape. The height H is preferably 0.5 to 20 mm, more preferably 2.0 to 12.0 mm, from the viewpoint of further improving the follow-up and adhesion to the user's skin. The elastic member 11 is arranged at least in a contact portion (a portion that is designed to have a high absorption performance on the assumption that the user's blood discharge port comes into contact when designing a product), The length L is preferably 15% or more of the entire length of the sanitary napkin 1 in order to obtain the desired effect more effectively in the present invention, and it is 29% or more for any type of product. It is more preferable because a sufficient effect can be obtained. In the present embodiment, the sanitary napkin 1 is disposed over substantially the entire length direction.
The width W of the elastic member 11 is preferably 5 to 50% of the entire width of the absorbent article. Since the average blood drainage port width is 1 cm, the width of the contact portion is preferably 10 to 30 mm in consideration of individual body type differences and deviations. In addition, since the product width of the sanitary napkin is currently 60 to 116 mm, 5 to 50% is set to be the optimum shape.
[0016]
The covering sheet 21 covers a surface other than the bonding surface of the elastic member 11 and is bonded and fixed to the top sheet 7 by heat sealing or hot melt in the vicinity 21a of the side edge of the elastic member 11. Further, both end portions 21b of the covering sheet 21 are sealed together with the top sheet 7 and the back sheet 3 by heat sealing or hot melt at the end portions of the sanitary napkin 1, respectively.
[0017]
The elastic member 11 is not particularly limited as long as it is hydrophobic, returns to its original shape even when compressed, and has elasticity. For example, urethane foam, sponge, natural rubber, polyurethane elastic body, etc. Rubbers such as synthetic rubber are used.
The material of the covering sheet 21 is not particularly limited as long as it has a sparse / dense region. For example, a large number of hydrophobic non-woven fabrics made of hydrophobic fibers such as polyolefin and hydrophobic sheets such as polyolefin sheets can be used. A porous sheet provided with apertures (the same as that used for the top sheet can be used) or the like can be used. The dense area 21c extends from the contact portion to the blood drainage port of the user to the top sheet 7 (and further the absorber 5), and the dense area 21c constitutes a body fluid guiding means.
The appearance of the sanitary napkin 1 appears to have a mid-high portion shaped like a ridge fixed on the top sheet 7.
[0018]
And the sanitary napkin 1 of this embodiment can be used by sticking the adhesion part 3b to underwear similarly to a normal sanitary napkin. During use, since the elastic member 11 is provided as a follow-up / contact means, the covering sheet 21 is continuously drained by the elastic member 11 expanding and contracting even when the user's body moves. It can be brought into contact with the mouth.
The menstrual blood discharged against the covering sheet 21 as fluid guiding means is induced by capillary action to the topsheet 7 along the cover sheet 21.
[0019]
Therefore, also can be guided absorbed into the absorbent body discharged menstrual blood without being affected by the shift-twist as napkins without wings as in this embodiment, it is possible to prevent leakage. In addition, since there is no leakage as a sanitary napkin without wings in this way, the advantages of the sanitary napkin without wings, that is, wearing and detaching are easier and easier to use than those with wings. In addition, there is no rash or rubbing by the blades, and an effect that the feeling of use is good can be exhibited.
[0020]
Next, other embodiments of the sanitary napkin as the absorbent article of the present invention will be described.
Here, in the following description, it demonstrates centering on a different point from the above-mentioned embodiment. For the points that are not particularly described, the description in the above-described embodiment is applied as appropriate.
The sanitary napkin 101 shown in FIG. 4 has a covering sheet in which the following / contact means is made of an elastic member 111, and the body fluid guiding means covers the entire surface of the elastic member 111 and is fixed to the top sheet 107. The elastic member 111 is provided on the top sheet 107 with the covering sheet 121 interposed therebetween.
[0021]
Specifically, after covering the entire surface of the quadrangular prism-shaped elastic member 111 with the covering sheet 121, the side edge portion 121 b of the covering sheet 121 is fixed to the top sheet 7 by heat sealing or hot melt. As a result, a bag-like body fluid guiding means is formed, and a follow-up / contact means is formed in the body fluid guiding means by the elastic member 111 in a state of being fixed to nothing.
And since the sanitary napkin 1 of this embodiment is a state with a high freedom degree in which the elastic member 111 is not fixed to anything, the follow-up and contact | adherence performance to a user's skin is improved more, and more leakage is carried out. This can be prevented and the user can move more easily.
[0022]
In the sanitary napkin 201 of the form shown in FIG. 5, the following contact means includes an elastic member 211 fixed to the top sheet 207, and the body fluid guiding means covers the elastic member 211, and the top sheet 207 The covering sheet 221 is a fixed covering sheet 221 formed by forming a hydrophilic portion 221b in a predetermined pattern on a hydrophobic sheet. That is, in the sanitary napkin 201 of the present embodiment, the covering sheet 221 has a hydrophobic portion 221a and a hydrophilic portion 221b.
[0023]
Specifically, in the sanitary napkin 201 of the present embodiment, the covering sheet 221 is formed with a lattice-shaped hydrophilic portion 221b and a plurality of rectangular hydrophobic portions 221a separated by the hydrophilic portion 221b. Has been. And the hydrophilic part 221b is extended from the contact part to a user's blood drain opening to the top sheet 7 (and also the absorber 5), and the bodily fluid guidance | induction means is comprised by this hydrophilic part 221b. .
When making the hydrophilic part 221b linear, the thickness T of each hydrophilic part 221b shall be 1-30 mm, and the formation ratio of the hydrophilic part 221b is 40-60% with respect to the area of the coating sheet 221 whole. It is preferable to improve the body fluid induction effect.
[0024]
As the hydrophobic sheet, a non-woven fabric made of hydrophobic fibers such as polyolefin, a porous sheet in which a number of openings are provided in a plastic sheet made of the hydrophobic resin, and the like are used. And the hydrophilic part 221b can be formed by pattern-applying a hydrophilic treatment agent such as a surfactant in the production line (or outside the production line).
The covering sheet 221 used in this case is not limited to the pattern shown in FIG. 5 in which the hydrophilic portion 221b is formed, and other patterns, for example, the covering sheet 221 ′ in the sanitary napkin 201 ′ shown in FIG. As described above, a pattern in which three linear hydrophilic portions 221b are arranged to intersect each other may be used.
The sanitary napkin of the present embodiment has further improved body fluid guiding performance, and can further prevent leakage.
[0025]
In the sanitary napkin 301 of the form shown in FIGS. 7 and 8, the following / contact means includes an elastic member 311 having a hydrophilic portion 311b and a hydrophobic portion 311a, and the body fluid guiding means is attached to the elastic member 311. The hydrophilic portion 311b is formed.
The hydrophilic portion 311b and the hydrophobic portion 311a are each plate-shaped, and are alternately overlapped and bonded by hot melt or the like, so that the shape of the entire elastic member is a quadrangular prism shape.
[0026]
Examples of the material for forming the hydrophilic portion 311b of the elastic member 311 include hydrophilic polyurethane foam, and examples of the material for forming the hydrophobic portion 311a include polyurethane foam (which is usually hydrophobic).
The sanitary napkin of this embodiment is further improved in both body fluid guiding performance and follow-up / adhesion performance.
[0027]
Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. Included in the invention.
The present invention can be applied not only to sanitary napkins but also to absorbent articles such as panty liners, incontinence pads, and disposable diapers.
The shape of the elastic member is not limited to the above-described quadrangular prism shape, and may be various shapes such as a bowl-like shape.
The body fluid guiding means only needs to extend from the contact portion to the body fluid excretion portion of the user to the top sheet (and further the absorber), and there are various patterns other than those described above.
[0028]
【The invention's effect】
As described above, the absorbent article of the present invention has the ease of use of an absorbent article that does not leak due to misalignment or twisting, particularly a sanitary napkin without blades, and is free from rashes and rubs. There is no leakage caused by misalignment or misalignment.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a preferred embodiment of an absorbent article of the present invention.
2 is a cross-sectional view taken along the line II-II of the absorbent article according to the embodiment shown in FIG.
3 is a cross-sectional view taken along the line III-III of the absorbent article according to the embodiment shown in FIG.
FIG. 4 is a cross-sectional view in the width direction (corresponding to FIG. 2) showing another embodiment of the absorbent article of the present invention.
FIG. 5 is a perspective view showing another embodiment of the absorbent article of the present invention.
FIG. 6 is a perspective view showing another embodiment of the absorbent article of the present invention.
FIG. 7 is a perspective view showing another embodiment of the absorbent article of the present invention.
8 is a VIII-VIII cross-sectional view of the absorbent article shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 3 ... Back sheet, 5 ... Absorber, 5a ... Absorption core, 5b ... Crepe paper, 7 ... Top sheet, 11 ... Elastic member, 21 ... Cover sheet, 21c ... Dense area | region

Claims (4)

In an absorbent article comprising a liquid permeable top sheet, a liquid impermeable back sheet, and an absorbent body positioned between the top sheet and the back sheet,
The body fluid guiding means provided on the top sheet for guiding the excreted body fluid to the absorber, and the body fluid guiding means following the user's movement and closely contacting the user's body fluid excretion part The follow-up / contact means comprises an elastic member having a hydrophilic portion and a hydrophobic portion fixed to a top sheet, and the body fluid guiding means is a hydrophilic member formed on the elastic member. absorbent article characterized in that it consists of parts. 2. The absorbent article according to claim 1, wherein the hydrophilic portion and the hydrophobic portion of the elastic member are each plate-like, and are superposed and bonded alternately to form a quadrangular prism shape as a whole . The absorbent article according to any one of claims 1 and 2 , wherein the hydrophilic portion of the elastic member is a polyurethane foam subjected to hydrophilic treatment, and the hydrophobic portion is a polyurethane foam . The absorbent article according to any one of claims 1 to 3 , wherein the absorbent article is of a bladeless type.

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