JP3856941B2 - Absorbent articles - Google Patents

Absorbent articles Download PDF

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Publication number
JP3856941B2
JP3856941B2 JP10485998A JP10485998A JP3856941B2 JP 3856941 B2 JP3856941 B2 JP 3856941B2 JP 10485998 A JP10485998 A JP 10485998A JP 10485998 A JP10485998 A JP 10485998A JP 3856941 B2 JP3856941 B2 JP 3856941B2
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JP
Japan
Prior art keywords
absorbent article
sheet
absorbent
contact surface
skin contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP10485998A
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Japanese (ja)
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JPH11299821A (en
Inventor
稔 中西
淳 村井
宏典 河崎
浩美 滝田
奈美江 糸井
Original Assignee
花王株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to JP10485998A priority Critical patent/JP3856941B2/en
Publication of JPH11299821A publication Critical patent/JPH11299821A/en
Application granted granted Critical
Publication of JP3856941B2 publication Critical patent/JP3856941B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

BACKGROUND OF THE INVENTION
[0001]
The present invention relates to an absorbent article such as a sanitary napkin or an incontinence pad, which has excellent fit, and has high twist prevention and leakage prevention performance.
[0002]
[Background Art and Problems to be Solved by the Invention]
Conventionally, as absorbent articles such as sanitary napkins and incontinence pads, a liquid-permeable surface layer, a liquid-impermeable leak-proof layer and a liquid-retaining absorbent layer interposed between the two layers are provided. What is formed substantially vertically long is widely used.
Such absorbent articles are required to have high fit and prevent leakage, and various proposals have been made.
[0003]
For example, in Japanese Patent Application Laid-Open No. 7-502438 and Japanese Patent Application Laid-Open No. 7-446, an absorbent article having a hollow loop that is spaced apart from the absorbent layer by arranging an elastic member outward in the width direction of the absorbent layer. Proposed.
However, those having a loop separated from the absorbent layer as described above cannot have a size that can provide sufficient fit, and stress from the left and right such as the movement of the wearer's foot. Even when it was applied, it could not be buffered at the loop portion, and stress was applied directly to the absorption layer, resulting in twisting, and the leakage prevention property was not sufficient.
[0004]
Accordingly, an object of the present invention is to provide an absorbent article that has high fit and is excellent in preventing twisting and leakage.
[0005]
[Means for Solving the Problems]
As a result of studying to solve the above problems, the present inventors have provided an absorbent article in which elastic sheets are provided on both left and right side edges of the absorbent layer, and hollow hollow parts are formed on both side edges of the absorbent layer. It has been found that the above object can be achieved.
[0006]
The present invention relates to an absorbent article comprising a liquid-permeable surface layer, a liquid-impermeable leak-proof layer, and a liquid-retaining absorbent layer interposed between the two layers and formed substantially vertically. In the left and right side edges of the absorbent article, elastic sheets having a belt-like stretchability are disposed so that both side edges are located inward of the absorbent article rather than the side edges of the absorbent layer. The elastic sheet forms a pair of left and right loop-shaped hollow portions, and the elastic sheet extends in the longitudinal direction of the absorbent article and / or the skin contact surface side of the absorbent article and / or It is fixed to the non-skin contact surface side and is curved concavely toward the skin contact surface side in the longitudinal direction of the absorbent article due to the contraction force of the elastic sheet, and the width direction of the absorbent article In this case, the pair of left and right hollow portions are raised upward from the skin contact surface. It is intended to provide an absorbent article, characterized in that.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the absorbent article of the present invention will be described in more detail with reference to the drawings.
Here, FIG. 1 is a perspective view showing a sanitary napkin as a first embodiment of the absorbent article of the present invention, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1.
[0008]
The sanitary napkin 1 according to the first embodiment shown in FIGS. 1 to 3 includes a surface sheet 21 as a liquid-permeable surface layer 2, a back sheet 41 as a liquid-impermeable leak-proof layer 4, and a gap between both layers. It has an absorbent body 31 as an intervening liquid-retaining absorbent layer 3 and is formed substantially vertically.
[0009]
Thus, in the sanitary napkin 1 of the present embodiment, the belt-like elastic sheets 51 are respectively provided on the left and right side edges 3 a and 3 b of the napkin, and the both side edges 51 a and 51 b are the side edges 31 a of the absorber 31. , 31b is disposed so as to be located inward of the sanitary napkin 1, and a pair of left and right loop-shaped hollow portions 5 are formed by the elastic sheet.
[0010]
More specifically, each of the pair of hollow portions 5 and 5 has a state of standing upward from the skin contact surface of the napkin 1. That is, in the present embodiment, the elastic sheet 51 has elasticity and is fixed to the skin contact surface side and the non-skin contact surface side of the napkin 1 in a state of being stretched in the longitudinal direction of the napkin 1. The hollow portion 5 is erected upward due to the contraction force of the elastic sheets 51, 51. The sanitary napkin 1 has a cup shape as shown in FIG. That is, in the longitudinal direction, as shown in FIG. 3, it is concavely curved toward the skin contact surface side, and in the width direction, the left and right hollow portions 5 are erected as shown in FIG. The whole is cup-shaped.
Here, “standing” means a state in which the upper surface of the loop-shaped hollow portion (the uppermost portion) is positioned above the skin contact surface (surface sheet 21), preferably the hollow portion is It means a state that is in an inclined form and is in such a state.
As shown in FIGS. 2 and 3, the absorbent body 31 is mounted on the lower absorbent body 32 having a large thickness and a central portion of the lower absorbent body 32, and is convex at the central portion of the sanitary napkin. And an upper layer absorber 33 that forms the raised portion 34 of the upper layer.
The top sheet 21 is arranged so that the side edge portion is located on the back side of the absorbent body 31 at the side portion of the sanitary napkin 1 so as to cover the left and right side edges of the absorbent body 31. Further, the back sheet 1 is formed wider than the absorber 31. At both ends in the longitudinal direction of the sanitary napkin 1, the top sheet 21 and the back sheet 41 are directly joined. In addition, although joining can be performed via a heat seal or an adhesive agent, in this embodiment, it joins by heat seal.
[0011]
The elastic sheets 51 are arranged one by one on the left and right side edges 3a and 3b of the absorber 31, respectively. Each elastic sheet 51 has one side edge 51 a located on the surface on the skin contact surface side so as to sandwich the top sheet 21 and the absorber 31, and the other side edge 51 b between the top sheet 21 and the back sheet 41. It is arranged to be located in. The other side edge 51b side of the elastic sheet 51 is also bonded to the back sheet 41, but it is not necessary that all the portions that contact the back sheet 41 are bonded, and in this embodiment, the region where the absorber 31 exists. Is bonded, but not on the outside.
The hollow portion 5 has an elliptical shape and is erected obliquely above the absorber 31.
[0012]
The outer peripheral length L of the hollow portion 5 (see FIG. 2, the length of the portion not fixed to another member) is preferably 20 to 80 mm.
If the outer peripheral length L is less than 20 mm, the fit may be reduced or the twist prevention effect may be insufficient. If it exceeds 80 mm, the loop shape is too large to fit between the crotch. This is not preferable.
The height of the hollow portion is preferably 5 to 40 mm.
If the height is less than 5 mm, the cup shape of the sanitary napkin as a whole may be impaired, and the leakage prevention effect may be lost. If the height exceeds 40 mm, the fit of the sanitary napkin center may be impaired. Therefore, it is not preferable.
[0013]
As shown in FIG. 1, a groove portion 6 is provided in the peripheral portion of the upper layer absorbent body 33, from the side portion to both end portions of the sanitary napkin 1, and in the one side edge portion 51 a of the elastic sheet 51. The groove 6 prevents liquid flow and maintains the shape of the absorber and the joined state of the elastic sheet.
On the surface of the back sheet, a pressure-sensitive adhesive is applied to form a shift preventing portion 7.
[0014]
Next, materials for forming each member constituting the sanitary napkin will be described.
As a material for forming the topsheet 21, the backsheet 41, and the absorber 31, any material that can be used for absorbent articles such as sanitary napkins can be used without particular limitation.
[0015]
The elastic sheet preferably has stretchability, and when the loop shape is formed, the elastic sheet needs to have a rigidity that allows the loop shape to be formed and freely deformed without any sense of incongruity while maintaining the loop shape. Further, it preferably has liquid impermeability.
Regarding the stretchable physical properties of the elastic sheet, the stress when stretched 5 to 50% in the longitudinal direction of the sanitary napkin is preferably 50 to 500 gf / 25 mm, more preferably 100 to 300 gf / width 25 mm. If the stress is less than 50 gf / 25 mm, the stretching force is too weak, the loop does not stand up, and a preferable curve in the longitudinal direction cannot be obtained, resulting in insufficient fit, and the stress is 500 gf / width 25 mm. Exceeding this is not preferable because the curve becomes tight in the longitudinal direction and the fitting property is similarly reduced.
[0016]
Next, the rigidity of the elastic sheet is preferably 5 to 200 gf, more preferably 10 to 100 gf in terms of bulk softness value. If the bulk softness value is less than 5 gf, the loop shape is too soft to be stable, and if it exceeds 200 gf, it is not preferable because it does not deform freely or becomes uncomfortable when worn.
Bulk softness can be measured as follows.
That is, the elastic sheet is cut out as a strip having a size of 150 mm in the longitudinal direction and 30 mm in the width direction, and both ends of the strip in the longitudinal direction are overlapped with each other by 5 mm so as to form a cylindrical shape. Two places are fixed with staples at a position of about 10 mm from the upper and lower edges of the cylinder.
Next, the sample is compressed with a Tensilon compression tester at a compression rate of 10 mm / min, and the maximum compressive strength until the cylinder buckles is measured. The average value of 5 measurements is taken as the bulk softness value.
[0017]
The elastic material of the elastic sheet is not particularly limited as long as it is a sheet material having the above-mentioned elastic properties and rigidity. For example, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, natural rubber, polyurethane , A film made of an ethylene-α olefin copolymer such as polyethylene-ethyl acrylate, a non-woven fabric, a woven fabric, a foam, and the like.
Moreover, the said elastic sheet is what touches skin directly on both sides of a napkin, and when the touch etc. are considered, the nonwoven fabric material is more preferable than a film etc.
In addition, even stretchable films are laminated with other thermoplastic non-woven fabrics made of polystyrene / polyester, polyethylene / polypropylene, and polypropylene for the purpose of improving the heat sealability and rigidity with the absorbent material and surface material. It may be used as When such a non-woven fabric is used, the non-woven fabric itself preferably has an elastic material, and it is preferable that the fiber itself is crimped to be made into a non-woven fabric. The stretched stretchable film may be stretched to a non-woven fabric that is not stretched, and these layers may be combined and bonded together by hot melt or heat sealing to be used as a sheet that stretches as a whole.
And as a curvature which curves to the skin contact surface side in the longitudinal direction of a sanitary napkin, it is desirable that the curvature radius r is preferably 50 to 300 mm, more preferably 100 to 200 mm. If the radius of curvature r is less than 50 mm, the napkin will be too curved and the fit will be lowered and it will be difficult to attach to the shorts, and if it exceeds 300 mm, it will be difficult to obtain a good fit to the body.
[0018]
The sanitary napkin 1 of the present embodiment configured as described above is used by being attached to underwear such as shorts via the stopper 7 during use.
And since it can always hold | maintain in the state fitted to the body and can absorb menstrual blood without creating a clearance gap, it is particularly excellent in side leakage prevention.
Specifically, since the hollow portion 5 is formed of an elastic sheet, even when the wearer moves during use, the hollow portion can be freely deformed to prevent a gap from being generated in the wearing portion, and To fit. In addition, even when the wearer walks and receives stress from the width direction of the absorbent article, since the hollow portion receives stress and relaxes, the stress received by the absorber is small, so it is difficult to twist, High fit and hardly leaks. This effect is particularly remarkable when the elastic sheet is directly bonded to the absorber.
[0019]
The sanitary napkin 1 according to the present embodiment, after packaging the absorbent body 31 with the top sheet 21, arranges the elastic sheet 51 on the left and right side edges 3a, 3b, and further arranges the back sheet 41 on the back side, Finally, it can be obtained by embossing to form a predetermined groove.
[0020]
Hereinafter, another embodiment of the present invention will be described with reference to FIGS.
Here, FIGS. 4 to 7 are cross-sectional views showing the main parts of other forms of the absorbent article of the present invention (the side portions in the cross section obtained by cutting the sanitary napkin at the center in the longitudinal direction similarly to FIG. 2). FIG.
In the following description, differences from the above-described first embodiment will be particularly described. The points described above are appropriately applied to points that are not particularly described.
[0021]
The sanitary napkin 1 according to the second embodiment shown in FIG. 4 is a so-called wing in which a back sheet 41 at a substantially central portion in the longitudinal direction is extended outward in the width direction to form a pair of left and right wing portions 8. A type of napkin.
[0022]
The sanitary napkin 1 of the third embodiment shown in FIG. 5 is arranged so that both side edges 51a and 51b of the elastic sheet 51 are located above the top sheet 21, and the top sheet 21 and the back sheet 41 are The outer edge of the absorber 31 is heat-sealed and joined.
[0023]
The sanitary napkin 1 according to the fourth embodiment shown in FIG. 6 is configured such that both side edges 51 a and 51 b of the elastic sheet 51 are positioned between the absorber 31 and the top sheet 21. Further, the top sheet 21 stops only covering the skin contact surface side of the absorber, the back sheet 41 covers the side surface of the absorber 31 and is positioned on the front side, and both side edges 51a and 51b of the elastic sheet 51 are Both of them are clamped and fixed by the back sheet 41 and the top sheet 21.
[0024]
In the sanitary napkin 1 of the fifth embodiment shown in FIG. 7, one side edge 51 a of the elastic sheet 51 is located between the absorber 31 and the top sheet 21, and the other side edge 51 b is the absorber 31 and the back sheet 41. It is made to be located between. Further, the top sheet 21 and the back sheet 41 are not present on the side surfaces of the absorber 31.
[0025]
In addition, the absorbent article of this invention is not restrict | limited to the above-mentioned form, A various change is possible in the range which does not deviate from the meaning of this invention.
For example, in the 1st-5th form, it can be set as the form which does not provide the groove part 6. FIG. In the fifth embodiment, the other side edge 51b is positioned on the surface of the back sheet 41, the one side edge 51a is positioned on the surface of the top sheet 21, and the other side edge 51b is positioned on the surface of the back sheet 41. It is good also as a form.
[0026]
【The invention's effect】
The absorbent article of the present invention is excellent in fit, twist prevention, and leakage prevention properties, and can effectively prevent side leakage in particular.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of an absorbent article of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a cross-sectional view taken along the line III-III in FIG.
FIG. 4 is a cross-sectional view showing the main part of another embodiment of the absorbent article of the present invention.
FIG. 5 is a cross-sectional view showing the main part of another embodiment of the absorbent article of the present invention.
FIG. 6 is a cross-sectional view showing the main part of another embodiment of the absorbent article of the present invention.
FIG. 7 is a cross-sectional view showing another embodiment of the absorbent article of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sanitary napkin 2 Surface layer 21 Surface sheet 3 Absorption layer 3a, 3b Side edge part 31 Absorber 31a, 31b Side edge 32 Lower layer absorber 33 Upper layer absorber 34 Raised part 4 Leak-proof layer 41 Back surface sheet 5 Hollow part 51 Elasticity Sheet 51a, 51b Side edge 6 Groove part 7 Slip prevention part

Claims (3)

  1. In an absorbent article comprising a liquid-permeable surface layer, a liquid-impermeable leak-proof layer, and a liquid-retaining absorbent layer interposed between the two layers, and formed substantially vertically, the absorptivity On the left and right side edges of the article, elastic sheets having a belt-like stretchability are arranged so that both side edges are located inward of the absorbent article with respect to the side edges of the absorbent layer. A pair of left and right loop-shaped hollow portions are formed by the sheet,
    The elastic sheet is fixed to the skin contact surface side and / or the non-skin contact surface side of the absorbent article in a state of being stretched in the longitudinal direction of the absorbent article, and due to the contraction force of the elastic sheet, In the longitudinal direction of the absorbent article, it is concavely curved toward the skin contact surface side, and in the width direction, the pair of left and right hollow portions stand up from the skin contact surface. Absorbent article characterized by.
  2.   The absorbent article according to claim 1, wherein an outer peripheral length of the hollow portion is 20 to 80 mm.
  3.   The absorbent article according to claim 1, wherein a height of the hollow portion is 5 to 40 mm.
JP10485998A 1998-04-15 1998-04-15 Absorbent articles Expired - Fee Related JP3856941B2 (en)

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