JP4424880B2 - Absorbent articles - Google Patents

Description

表１に示される生データに基づいて、初回係合力と、デニール数、波のピッチ及び波加工の高さとの関係が明確になるようにグラフを描いた。図６は縦軸を初回係合力(g)、横軸を使用不織布のデニール数としてグラフ化した結果を示し、図７は縦軸を初回係合力(g)、横軸を波のピッチ（mm）〔高さは０．５mmで一定〕としてグラフ化した結果を示し、図８は縦軸を初回係合力(g)、横軸を波の高さ（mm）〔ピッチは２mmで一定〕としてグラフ化した結果を示したものである。
【００３２】
上記図６のグラフより、使用不織布のデニール数が１．８デニール以下であるとグラフの勾配が急激に大きくなる傾向を示し初回係合力が上昇していることが分かる。したがって、前記ウイング状フラップＷの肌当接面側の不織布は、１．８デニール以下の繊維によって形成された不織布を使用するのが望ましいことが判明した。
【００３３】
上記図７のグラフより、３本のグラフ線は共に波のピッチ１mmを最大値とする山形の線を描くことが判明した。したがって、波のピッチは０．２〜２mmの範囲が望ましいことが判明した。
【００３４】
上記図８のグラフより、３本のグラフ線は波の高さが高くなるほど初回係合力が大きくなる傾向を示した。したがって、波加工の高さは０．５mm以上が望ましいことが判明した。
【００３５】
【発明の効果】
以上詳説のとおり本発明によれば、ウイング状フラップを備える吸収性物品において、ウイング状フラップに雄型面ファスナーを取付け、その雄型面ファスナーが係合する他方のウイング状フラップの不織布に波状加工を施すようにしたため、違和感が無く十分に良好な装着感が得られるようになるとともに、体動に対して十分な係合力が得られるようになる。
【図面の簡単な説明】
【図１】 本発明に係る生理用ナプキン１の一部破断展開図である。
【図２】 その裏面図である。
【図３】 図１のIII−III線矢視図である。
【図４】 その要部拡大断面図である。
【図５】 本生理用ナプキン１の装着状態図である。
【図６】 実施例における試験結果を示すグラフ（その１）である。
【図７】 実施例における試験結果を示すグラフ（その２）である。
【図８】 実施例における試験結果を示すグラフ（その３）である。
【図９】 従来の生理用ナプキンＮの展開図である。
【図１０】 その横断面図である。
【図１１】 その装着状態図である。
【符号の説明】
【００３６】
１…生理用ナプキン、２…不透液性裏面シート、３…透液性表面シート、４…吸収体、５…クレープ紙、６…サイド不織布、１０…雄型面ファスナー、１１…粘着剤層、Ｗ…ウイング状フラップ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorbent article provided with a wing-shaped flap, and relates to an absorbent article employing a hook-and-loop fastener in place of an adhesive layer formed on the non-skin contact surface side of the wing-shaped flap.
[0002]
[Prior art]
Conventionally, as an absorbent article N such as a sanitary napkin, a panty liner, a cage sheet, an incontinence pad, and the like, as shown in FIGS. 2. Description of the Related Art There is known a structure in which an absorbent body 52 made of cotton pulp or the like is interposed between a back sheet 50 and a liquid permeable top sheet 51 made of a nonwoven fabric or a permeable plastic sheet.
[0003]
In order to prevent misalignment, this type of absorbent article N has, for example, one or a plurality of adhesive layers 53, 53 formed on the non-use surface side (outer surface), and on both sides in the longitudinal direction of the napkin body. The wing-shaped flaps W, W extending outward are integrally formed, and the pressure-sensitive adhesive layer is formed on the surface of the wing-shaped flaps W, W on the liquid-impermeable back sheet 50 side (non-skin contact surface side). There exist some which provided 54,54. In the product state, a release paper is temporarily attached to each of the pressure-sensitive adhesive layers 53.
[0004]
When fixing the absorbent article N to the undergarment 30, first, as shown in FIG. 11, after peeling off the release paper temporarily attached to the non-skin contact surface side, the absorbent article N is locally The wing-shaped flaps W, W protruding sideways are taken out from the underwear, the wing-shaped flaps W, W are folded back at the folding lines RL, RL, and the crotch portion of the underwear 30 is wound around the crotch portion of the underwear. Adhere to the outer surface.
[0005]
[Problems to be solved by the invention]
However, in the absorbent article N provided with the wing-shaped flaps W, W, the wing-shaped flaps W, W are directly picked and pulled out by hand, so that the adhesive of the adhesive layer 54 adheres to the hand. In addition, there are problems that the adhesive is transferred to the underwear and soils the underwear, and that the adhesive is easily detached due to intense body movement.
[0006]
Therefore, the main problem of the present invention is that, in an absorbent article having a wing-shaped flap, a hook-and-loop fastener is used instead of the adhesive layer for fastening the wing-shaped flap, and there is no sense of incongruity and a sufficiently good wearing feeling is obtained. Another object of the present invention is to provide an absorbent article that can be obtained and that can provide sufficient engagement force with respect to body movement.
[0007]
[Means for Solving the Problems]
The inventors initially tried to attach one side of a hook-and-loop fastener to the wing-shaped flap W in place of the pressure-sensitive adhesive layer and mechanically engage the hook-and-loop fastener with the outer surface of an undergarment. However, when engaging with the undergarment, there are problems such as a large difference in engagement force depending on the material of the undergarment, stretching of the fibers of the undergarment, and inability to engage depending on the material.
[0008]
Therefore, the protruding length of the wing-shaped flap is lengthened so that there is an overlap margin when folded back to the back side, a male surface fastener is fixed to one side of this overlapping portion, and a female surface fastener is fixed to the other side. I fixed it. In this case, although it is possible to obtain a sufficient engaging force, it has been found that the overlapping portion of the hook-and-loop fastener becomes extremely hard, and the feeling of wearing is greatly impaired due to the uncomfortable feeling. In addition, problems such as an increase in cost occurred.
[0009]
As a result of further investigation, the protruding length of the wing-shaped flap is lengthened so that it has an allowance when folded back to the back side, a male surface fastener is fixed to one side of this overlapping portion, and the other wing is fixed. It was made to engage directly with the nonwoven fabric which covers the skin contact surface side of a shape-like flap. However, in this case, it was confirmed that the uncomfortable feeling was considerably eliminated and the wearing feeling was improved, but the engagement was weak and the engagement was naturally released when there was intense body movement.
[0010]
As a result of various studies for increasing the engagement force between the surface fastener and the nonwoven fabric, the present inventors have obtained knowledge that the engagement force can be increased by applying a wave-like process to the nonwoven fabric. The present invention has been made based on this finding.
[0011]
As a result, as the present invention according to claim 1 for solving the above-mentioned problem, an absorbent body is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet and protrudes laterally on both sides. In the absorbent article in which the wing-shaped flap was formed,
A side nonwoven fabric is provided on the both sides of the absorbent article along the longitudinal direction and over substantially the entire length of the absorbent article, and a part of the side nonwoven fabric extends laterally. In addition, a part of the liquid-impermeable back sheet extends laterally, and the wing-shaped flap is formed by the side nonwoven fabric and the liquid-impermeable back sheet that extend laterally. It is a non-woven fabric formed of 1.8 denier fibers or less, and the wing-shaped flap region portion is subjected to undulations by irregularities along the longitudinal direction of the absorbent article, and this undulation process has a height dimension of 0.5 mm. As described above, the interval between the convex portions or the concave portions is 0.2 to 2 mm.
The wing-shaped flaps, when folded to the back side, are formed to have a overlap leading ends of the respective wing-shaped flaps Rutotomoni, these non-skin contact surface side to the surface fastener of the wing-shaped flaps secured When the wing-shaped flaps are folded back to the back side in an arbitrary order, the hook-and-loop fastener of one wing-shaped flap is engaged with the side nonwoven fabric surface of the first folded wing-shaped flap. An absorbent article is provided.
[0012]
As the present invention according to claim 2, nonwoven skin contact surface side of the wing-shaped flaps, the absorbent article according to claim 1 Symbol mounting a spunbond nonwoven fabric is provided.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a partially broken development view of a sanitary napkin 1 according to the present invention, FIG. 2 is a rear view thereof, and is a view taken along the line III-III of FIG.
[0014]
The sanitary napkin 1 includes a liquid-impervious back sheet 2 made of a polyethylene sheet, a polypropylene sheet, etc., a liquid-permeable front sheet 3 that allows permeation of menstrual blood, cages, and the like, and a space between the two sheets 2 and 3. An absorbent body 4 made of cotton-like pulp or synthetic pulp intervening in the sheet, crepe paper 5 surrounding the absorbent body 4 for maintaining the shape and improving the diffusibility of the absorbent body 4, and longitudinally on both sides of the surface. It is comprised from the side nonwoven fabrics 6 and 6 formed along the direction. Around the absorber 4, at the upper and lower edge portions, the outer edge portions of the liquid-impervious back sheet 2 and the liquid-permeable surface sheet 3 are joined by an adhesive such as hot melt or an adhesive means such as heat seal. In addition, the liquid-impervious backsheet 2 and the side nonwoven fabric 6 that extend laterally from the absorbent body 4 at both side edges thereof are joined by an adhesive such as hot melt or an adhesive means such as heat seal. Has been.
[0015]
Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impermeable back sheet 2, a sheet material having at least water shielding properties such as an olefin resin sheet such as polyethylene or polypropylene is used. In addition, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or A nonwoven fabric sheet (in this case, the waterproof film and the nonwoven fabric constitute a liquid-impervious back sheet) can be used after substantially impervious to liquid imperviousness by interposing a waterproof film. In recent years, those having moisture permeability tend to be used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. It is a sheet.
[0016]
Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. In the illustrated example, the liquid-permeable surface sheet 3 has a two-layer structure including a porous plastic sheet 3A on the front surface side and a hydrophilic nonwoven fabric 3B on the back surface side.
[0017]
When the two-layered sheet is used as the liquid-permeable surface sheet 3, menstrual blood and urine (hereinafter collectively referred to as body fluid) are quickly absorbed, and the skin and The contact surface has excellent dry touch properties. In this case, as in this example, a crepe paper 5 surrounding the absorbent body 4 is provided, so that the crepe paper 5 is interposed between the liquid-permeable surface sheet 3 and the absorbent body 4 as a result. For example, the crepe paper 5 having excellent absorbability quickly diffuses body fluid and prevents reversal of these menstrual blood.
[0018]
On the other hand, on the upper surface of the liquid-permeable surface sheet 3, side embosses 7 and 7 are formed on both sides of the blood drainage corresponding site, respectively along the substantially longitudinal direction, and arcuate embossing 8 and 8 is formed.
[0019]
The absorbent body 4 interposed between the liquid-impervious back sheet 2 and the liquid-permeable top sheet 3 is made of, for example, fluffy pulp and a water-absorbing polymer. The water-absorbing polymer is mixed in the pulp constituting the absorber as, for example, granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolving pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price.
[0020]
Side sanitary napkins 1 are provided with side nonwoven fabrics 6 and 6 on both sides of the surface of the sanitary napkin 1 along the longitudinal direction and substantially the entire length of the absorbent article. A part of the liquid-impervious back sheet 2 extends sideways, a part of the liquid-impervious back sheet 2 extends sideways, and the side nonwoven fabric 6 portion and the liquid-impervious back sheet that extend sideways. The wing-shaped flaps W, W are formed by joining the two portions with a hot melt adhesive or the like, and the surface of the wing-shaped flaps W, W on the liquid-impervious back sheet 2 side is a male surface fastener 10, 10 is fixed. When the wing-shaped flaps W, W are folded back to the back side, the leading ends of the wing-shaped flaps W, W overlap each other, and the male surface fastener 10 of one wing-shaped flap W is folded back first. The wing-shaped flap W is engaged with the nonwoven fabric surface (side nonwoven fabric 6 surface).
[0021]
As the side nonwoven fabric 6, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of important functions. For example, if importance is placed on functions such as preventing permeation of menstrual blood or vaginal discharge, or enhancing the touch feeling, water repellent treatment coated with silicon, paraffin or alkylchromic chloride water repellent It is desirable to use a nonwoven fabric. Further, if importance is attached to the absorption of menstrual blood and the like in the wing-shaped flaps W, W, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the process of producing a synthetic fiber, , By treating with a metal salt such as stannic chloride, partially dissolving the surface to make it porous, and depositing metal hydroxides to swell or make the synthetic fiber porous, applying capillary action to make it hydrophilic It is desirable to use a hydrophilic treated non-woven fabric provided with.
[0022]
Further, the nonwoven fabric used by the side nonwoven fabric 6 is a range including at least an engagement portion with the male surface fastener 10 in the side nonwoven fabric 6 in order to increase the engagement force with the male surface fastener 10, specifically In this example, as shown in FIG. 4, a wavy process is applied to the region of the wing-shaped flap W.
[0023]
Although it is possible to increase the engagement force with the male surface fastener 10 by applying the wavy processing, the side nonwoven fabric 6 is more preferably formed of fibers of 1.8 denier or less from the examples described later. What is desirable, and the method of forming the nonwoven fabric can be natural fibers, synthetic fibers or regenerated fibers, etc., and can be formed by an appropriate processing method. It is desirable in terms of relatively higher tensile strength than other non-woven fabrics and no pulling out of fibers.
[0024]
Moreover, as for the wave-like process of the said nonwoven fabric, it is desirable for the height dimension (apparent thickness _tv ) to be 0.5 mm or more from the Example mentioned later, and the space | interval S between convex parts or concave parts is 0.2. It is desirable that it is ˜2 mm.
[0025]
On the other hand, a plurality of pressure-sensitive adhesive layers 11 and 11 are formed on the non-skin contact surface of the liquid-impermeable back sheet 2 by an appropriate application pattern for fixing to the shorts, as shown in FIG. In an unused product state, a release paper (not shown) that covers the adhesive layer is provided.
[0026]
As the pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer 11, for example, a styrene polymer, a tackifier, or a plasticizer, which is a main component, is preferably used. Examples of the styrenic polymer include styrene-ethylene-butylene-styrene block copolymers, styrene-butylene-styrene block copolymers, and styrene-isobutylene-styrene copolymers. It may be used or two or more polymer blends. Among these, a styrene-ethylene-butylene-styrene block copolymer is preferable in terms of good thermal stability. As the tackifier and plasticizer, those that are solid at room temperature can be preferably used. Examples of the tackifier include C5 petroleum resins, C9 petroleum resins, dicyclopentadiene petroleum resins, and rosin petroleum resins. Polyterpene resin, terpene phenol resin, etc., and examples of the plasticizer include monomer plasticizers such as trifresil phosphate, dibutyl phthalate, dioctyl phthalate, and polymer plasticizers such as vinyl polymers and polyesters. It is done.
[0027]
In order to attach the sanitary napkin 1 to an undergarment, after peeling off the release paper, as shown in FIG. 5, the wing-shaped flap W protruding sideways is applied to the sanitary napkin 1 locally. W is taken out from the underwear, the wing-shaped flaps W, W are folded in order, and the male surface fastener 10 of the other wing-shaped flap W is engaged with the nonwoven fabric surface (side nonwoven fabric 6 surface) of the first folded wing-shaped flap W. The napkin 1 is fixed to the underwear by combining.
[0028]
By the way, although the wing-shaped flap W was comprised as a laminated body of the side nonwoven fabric 6 and the liquid-impermeable back sheet 2 in the said example, the wing-shaped flap W may be comprised by the side nonwoven fabric 6 independently, and liquid-imperviousness may be comprised. You may make it laminate | stack a small nonwoven fabric only on the front-end | tip part of the back surface sheet 2. FIG. Further, although the male surface fastener 10 is provided on each of the wing-shaped flaps W, W, it may be provided only on one side. In this case, however, the turn-back order of the wing-shaped flaps W, W is limited at the time of wearing.
[0029]
【Example】
In this example, the relationship between the engagement force of the male surface fastener and the engagement force of the male surface fastener was tested while changing the wavy processing conditions (height and pitch) of the side nonwoven fabric. .
The shape of the engagement piece of the male surface fastener was limited to a mushroom-like engagement piece, and a product number CS-200 (2500 pin) manufactured by Sumitomo 3M Limited was used. In the test, a surface fastener test piece with a width of 15 mm x 50 mm was engaged with a target body composed of a plurality of types of non-woven fabrics with different heights and pitches applied to a polyethylene film, and a 2 kg rubber roller. And reciprocating and crimping at a speed of 50 mm / sec. (Engagement surface is 15 mm x 15 mm), a non-woven fabric-polyethylene film laminate is placed on a strograph chuck, and a surface fastener test piece is sandwiched between the other chuck, The tensile engagement force was measured at a speed of 300 mm / sec.
[0030]
In the case of a sanitary napkin, since it is not used repeatedly, the initial engagement force was used as the engagement force. The target engagement force was estimated to be 100 g or more as an engagement force that does not peel when worn. Further, the nonwoven fabric was made of three types of denier, 3 denier, 1.8 denier, and 1.1 denier, and each of the nonwoven fabrics prepared with a basis weight of 18 g / m ² was used. The test results are shown in Table 1.
[0031]
[Table 1]

Based on the raw data shown in Table 1, the graph was drawn so that the relationship between the initial engagement force, the denier number, the wave pitch, and the wave machining height could be clarified. FIG. 6 is a graph showing the results obtained by graphing the initial engagement force (g) on the vertical axis and the denier number of the nonwoven fabric used, and FIG. 7 shows the initial engagement force (g) on the vertical axis and the wave pitch (mm) on the horizontal axis. ) [The height is constant at 0.5 mm] and the graph shows the results. FIG. 8 shows the initial engagement force (g) on the vertical axis and the wave height (mm) on the horizontal axis (pitch is constant at 2 mm). The result of graphing is shown.
[0032]
From the graph of FIG. 6 above, it can be seen that when the denier number of the nonwoven fabric used is 1.8 denier or less, the slope of the graph tends to increase rapidly and the initial engagement force increases. Accordingly, it has been found that it is desirable to use a nonwoven fabric formed of fibers of 1.8 denier or less as the nonwoven fabric on the skin contact surface side of the wing-shaped flap W.
[0033]
From the graph of FIG. 7, it has been found that the three graph lines both draw a mountain-shaped line with the maximum value of the wave pitch of 1 mm. Accordingly, it has been found that the wave pitch is preferably in the range of 0.2 to 2 mm.
[0034]
From the graph of FIG. 8, the three graph lines showed a tendency that the initial engagement force increased as the wave height increased. Therefore, it has been found that the height of wave machining is preferably 0.5 mm or more.
[0035]
【The invention's effect】
As described above, according to the present invention, in an absorbent article having a wing-shaped flap, a male surface fastener is attached to the wing-shaped flap, and the non-woven fabric of the other wing-shaped flap engaged with the male surface fastener is corrugated. Therefore, a sufficiently good wearing feeling can be obtained without causing a sense of incongruity, and a sufficient engaging force can be obtained for body movement.
[Brief description of the drawings]
FIG. 1 is a partially broken development view of a sanitary napkin 1 according to the present invention.
FIG. 2 is a rear view thereof.
FIG. 3 is a view taken along the line III-III in FIG. 1;
FIG. 4 is an enlarged cross-sectional view of a main part thereof.
FIG. 5 is a mounting state diagram of the sanitary napkin 1;
FIG. 6 is a graph (part 1) showing test results in the examples.
FIG. 7 is a graph (part 2) showing test results in the examples.
FIG. 8 is a graph (part 3) showing test results in the examples.
FIG. 9 is a development view of a conventional sanitary napkin N.
FIG. 10 is a cross-sectional view thereof.
FIG. 11 is a diagram showing the mounting state.
[Explanation of symbols]
[0036]
DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid-impermeable back sheet, 3 ... Liquid-permeable surface sheet, 4 ... Absorber, 5 ... Crepe paper, 6 ... Side nonwoven fabric, 10 ... Male surface fastener, 11 ... Adhesive layer , W ... Wing flap

Claims (2)

In the absorbent article in which the absorbent body is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet, and the wing-like flaps protruding sideways are formed on both sides, respectively.
A side nonwoven fabric is provided on the both sides of the absorbent article along the longitudinal direction and over substantially the entire length of the absorbent article, and a part of the side nonwoven fabric extends laterally. In addition, a part of the liquid-impermeable back sheet extends laterally, and the wing-shaped flap is formed by the side nonwoven fabric and the liquid-impermeable back sheet that extend laterally. It is a non-woven fabric formed of 1.8 denier fibers or less, and the wing-shaped flap region portion is subjected to undulations by irregularities along the longitudinal direction of the absorbent article, and this undulation process has a height dimension of 0.5 mm. As described above, the interval between the convex portions or the concave portions is 0.2 to 2 mm.
The wing-shaped flaps, when folded to the back side, are formed to have a overlap leading ends of the respective wing-shaped flaps Rutotomoni, these non-skin contact surface side to the surface fastener of the wing-shaped flaps secured When the wing-shaped flaps are folded back to the back side in an arbitrary order, the hook-and-loop fastener of one wing-shaped flap is engaged with the side nonwoven fabric surface of the first folded wing-shaped flap. Absorbent article. The side nonwoven fabric, an absorbent article according to claim 1 Symbol mounting a spunbond nonwoven.

Images