JP4035341B2 - Sanitary napkin - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sanitary napkin that absorbs and retains menstrual blood and prevents leakage to the back side, and more particularly to a sanitary napkin having a surface embossed row in which unit surface embosses are arranged at small intervals.
[0002]
[Prior art]
As the sanitary napkin, there are so-called daytime napkins suitable for use during the day with a large amount of exercise and so-called night napkins suitable for use at bedtime. The night napkin has a shape in which the buttocks side is greatly projected to prevent back leakage that is likely to occur particularly at bedtime, and is an asymmetrical shape.
[0003]
On the other hand, the commercially available daytime napkin is small so that its use is not conspicuous (usually the length in the longitudinal direction is 15 to 20 cm for a so-called light day, 20 to 24 cm for a normal-long time, and long. 24 to 28 cm for time), and has a symmetric shape. Thus, since the daytime napkin has a symmetrical shape, it can be mounted regardless of the front-rear direction.
[0004]
In any napkin, it is the most important matter required for a product to prevent leakage in the front-rear and left-right directions.
[0005]
There are various means for this purpose. Broadly speaking, a means for quickly introducing menstrual blood into the absorbent body, a depth of 30% or more of the thickness of the absorbent core from the liquid-permeable topsheet side in the front and rear and / or side portions. By means of squeezing, the groove is formed, and a means for inducing menstrual blood along the groove, a flap standing on the use surface side at the side or a gather sheet provided with an elastic elastic member on the flap There are means to prevent side leakage by blocking blood. For this purpose, various concrete means have been proposed.
[0006]
[Problems to be solved by the invention]
In the center of the product in the longitudinal direction (slightly forward from the center in the longitudinal direction on the night napkin extending to the heel side), embossing is formed only on the liquid-permeable top sheet mainly from the viewpoint of design, and the above menstrual blood As a means for quickly guiding the liquid into the absorbent body, there is also known one in which the liquid-permeable top sheet to the surface portion of the lower absorbent body are integrated.
[0007]
On the other hand, the formation of the above-mentioned groove is effective for preventing leakage and also effective for preventing twisting when the napkin is attached, and is a technique that has been widely used in recent years.
[0008]
However, by forming a large number of grooves in the vicinity of the edge of the absorber (for example, a plurality of rows spaced in the longitudinal direction), even if the leakage prevention effect is enhanced, it is mainly at the position of the groove on the center side. The specified absorption holding area (volume) becomes small, which is undesirable from the viewpoint of absorption capacity. In addition, it has been found that when a large number of grooves are formed in the vicinity of the edge of the absorber, the rigidity of the groove forming region is increased, the fitting property at the time of wearing is hindered, and leakage is liable to occur.
[0009]
Then, the main subject of this invention is to prevent the leakage from a peripheral part effectively, without inhibiting the fitting property at the time of mounting | wearing. Another problem is to prevent leakage from the peripheral portion while limiting the number of the grooves as much as possible even if the grooves are formed. Another problem will become clear in relation to the effects described later.
[0010]
[Means for Solving the Problems]
The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A sanitary napkin in which menstrual blood passing through a liquid-permeable top sheet is held by an absorbent element material including an absorbent core and leakage to the back side is prevented,
On the use surface side of the liquid-permeable top sheet of at least one end portion of the front and rear end portions of 80 mm or less from the front and rear end edges of the absorbent core,
A plurality of surface embossed rows that extend over a length range of at least 10 mm to the left and right across a longitudinal line passing through the center of contact with the blood outlet of the product along a line extending in the width direction are spaced in the longitudinal direction. Formed side by side,
Each surface embossed row In contact with the absorbent element material, And the unit surface emboss which consists of a recessed part of 10% or less of the thickness of an absorption core which does not change an absorption core is formed and arranged at intervals of 4 mm or less,
Furthermore, it extends in the width direction at least one side before and after the longitudinal intermediate portion of the sanitary napkin, and the high-pressure squeezed portions and the low-pressure squeezed portions appear alternately and are compressed at a depth of 30% or more of the thickness of the absorbent core. Curved toward the front and rear ends Front and rear groove When,
On the left and right of the widthwise intermediate part of the sanitary napkin, the side groove is squeezed with a depth of 30% or more of the thickness of the absorbent core extending in the longitudinal direction,
A blood drainage contact portion is located between the front and rear grooves, and the surface embossed row is outward in the longitudinal direction of the front and rear grooves. positioned, A sanitary napkin characterized by that.
[0011]
(Function and effect)
The blood drainage contact part is located at the longitudinal center of the product (or the absorbent body) (slightly forward from the longitudinal center in the case of a night napkin extending to the buttocks side) and includes the blood drainage contact part In the middle region, it is important to quickly drain the menstrual blood into the absorber. However, the diffusion flow that flows mainly in the front-rear direction along the surface of the liquid-permeable top sheet may not be completely prevented. In particular, when a movement in which the local part tilts back and forth is added, the tendency becomes strong. If other means are employed to completely prevent this diffusion flow, other characteristics such as fit may be hindered as described above.
Therefore, in the present invention, since the amount of menstrual blood per unit time to be received is small at the front and rear end portions of 80 mm or less from the front and rear end edges of the absorber, a shallow surface emboss is formed instead of a deep compressed groove that provides high rigidity. Then, if the diffusion flow in the front-rear direction is suppressed, the absorbent penetrates in the meantime, and therefore the main idea is that leakage in the front-rear direction can be prevented without impairing the fit.
[0012]
For this purpose, the surface along the line extending in the width direction over a length range of 10 mm or more at least from side to side across the longitudinal line of the product with unit surface embossing from the use surface side of the liquid-permeable top sheet being 4 mm or less. An emboss row is formed. Here, the unit surface emboss is In contact with the absorbent element material Do not deform the absorbent core, or In contact with the absorbent element material The recess is formed within a range of 10% or less of the thickness of the absorbent core.
[0013]
The unit surface embossing of the present invention does not deform or substantially does not deform the absorbent core. Therefore, as described above, forming a groove by excessive squeezing or the like increases the rigidity and does not cause a situation in which the fitting property at the time of wearing is inhibited.
[0014]
If the surface embossing row is formed according to the present invention, the diffusion flow in the front-rear direction will stay there and the diffusion rate will be slow. Since there is an absorber below the surface emboss row, menstrual blood having a slow diffusion rate penetrates into the absorber. As a result, the diffusion flow (amount or speed) of menstrual blood going outward from the surface embossed row becomes small and eventually permeates the absorbent body. As a result, front-rear leakage can be prevented.
[0015]
Although a continuous linear shape is conceivable instead of the surface embossed row formed by the unit surface embossed group, menstrual blood flows along the line to cause side leakage. Therefore, it is desirable that the unit surface embossing be a surface embossing row with an interval of 4 mm or less. The lower limit interval is desirably 1 mm or more from the viewpoint of preventing side leakage. It has been found that when the unit surface emboss interval exceeds 4 mm, there is no effect of slowing the surface diffusion flow.
[0016]
In addition, when there is a large amount of blood drainage that exceeds the speed at which the absorbent can receive the discharged menstrual blood, the amount of flow before and after diffusion also increases, and it may not be possible to prevent front and back leakage only by forming a surface embossed row. . Furthermore, menstrual blood that has once penetrated the absorbent body may flow back and forth in the absorbent body due to compression or deformation of the absorbent body due to the movement of the wearer, and may leak from the front and rear edges. On the other hand, the surface diffusion flow is formed by forming front and rear grooves that extend in the width direction before and after the longitudinal intermediate portion of the sanitary napkin and are compressed with a depth of 30% or more of the thickness of the absorbent core. And the flow in the front-rear direction in the absorbent body can be substantially prevented.
Although the front and rear groove per se is a known one, the present invention alternately presents a high-pressure squeezed portion and a low-pressure squeezed portion, and is a groove that is squeezed at a depth of 30% or more of the thickness of the absorbent core. A surface embossing row is formed outside the longitudinal groove in the longitudinal direction. Therefore, even if a surface diffusion flow exceeding the front and rear grooves is generated, the surface diffusion flow amount is relatively small, and therefore the front and rear leakage can be prevented by the formed surface embossing row. Further, when the side groove is formed, the same effect as that of the front and rear grooves is obtained (this is simply a word substitution, and the description is omitted).
[0017]
Further, by forming a plurality of surface embossed rows at intervals in the longitudinal direction, the front-rear leakage prevention effect is further enhanced.
[0018]
<Invention of Claim 2>
The distance between the surface embossed rows is Greater than the distance between the unit surface embossing in the width direction The sanitary napkin according to claim 1.
[0019]
(Function and effect)
The distance between the surface emboss rows is preferably larger than the distance between the unit surface embosses in the width direction. When the distance is equal or small, the degree of surface diffusion flow prevention between adjacent surface embossed rows becomes excessive, and side leakage tends to occur. In addition, fit and skin feel deteriorate.
[0020]
<Invention of Claim 3>
On the side of the liquid-permeable top sheet used on the left and right side portions of 25 mm or less from the width direction side edge of the absorbent core and on the outer side in the width direction of the side groove,
At least across the transverse line passing through the center of contact with the blood outlet of the product along the line extending in the longitudinal direction Back and forth A side surface embossed row extending over a length range of 25 mm or more is formed,
Each side surface embossed row is In contact with the absorbent element material, 3. The sanitary napkin according to claim 1 or 2, wherein the unit surface embossing is formed so as not to deform the absorbent core or to have a unit surface emboss composed of recesses of 10% or less of the thickness of the absorbent core with an interval of 4 mm or less.
[0021]
(Function and effect)
Although the inventions of the first to third aspects relate to surface embossing for preventing front and rear leakage, surface embossing at the side portions can be formed to prevent side leakage. Of course, it includes an aspect in which both front and rear surface embossing and side surface embossing are formed.
In any case, by forming the surface embossing at the side part, the same effect is obtained with the same principle as the case of surface embossing at the front and rear (this is just a word substitution, so the description is omitted) To do).
[0022]
<Invention of Claim 4>
The sanitary napkin according to claim 2, wherein a plurality of side surface embossed rows are formed at intervals in the width direction, and the distance between the surface embossed rows is longer than the lengthwise interval between the unit surface embosses.
[0023]
(Function and effect)
Lateral leakage is further prevented.
[0024]
<Invention of Claim 5>
In the blood outlet contact part, In contact with the absorbent element material Do not deform the absorbent core, or In contact with the absorbent element material The sanitary napkin according to claim 1 or 2, wherein a large number of surface-absorbing embosses that form recesses are dispersed and formed within a range of 10% or less of the thickness of the absorbent core.
[0025]
(Function and effect)
In the intermediate region including the blood outlet contact portion, it is important to quickly guide the discharged menstrual blood into the absorbent body. By dispersing and forming a large number of the surface absorption embosses, menstrual blood can be quickly introduced into the absorbent body through the surface absorption embossed portions.
In this case, if the distance between the adjacent surface absorption embosses is not larger than the distance between the unit surface embosses along the surface emboss row, the effect of rapidly guiding the discharged menstrual blood into the absorbent body is very small.
[0026]
<Invention of Claim 6>
The sanitary napkin according to any one of claims 1 to 5, wherein in the region where the absorbent core is present, outward leakage preventing means is provided outward from the product from the surface embossed row.
[0027]
(Function and effect)
In the region where the absorption core is present, it is desirable that an outward leakage prevention means is provided outside the product from the surface embossed row.
[0028]
<Invention of Claim 7>
The sanitary napkin according to claim 6, wherein the outer leakage preventing means is a groove that is squeezed at a depth of 30% or more of the thickness of the absorbent core along a direction intersecting the inner and outer directions.
[0029]
(Function and effect)
When the outer leakage prevention means is a groove that is squeezed at a depth of 30% or more of the thickness of the absorbent core along the direction intersecting the inner and outer directions, the surface diffusion flow beyond the surface embossing row can be prevented. In addition, the longitudinal flow in the absorbent body can be substantially prevented.
[0030]
<Invention of Claim 8>
The absorbent element material has an absorption promoting sheet on the side facing the back surface of the liquid permeable top sheet, and the liquid permeable top sheet and the absorption promoting sheet are integrated by surface embossing by heat fusion. The sanitary napkin according to any one of claims 1 to 7, wherein the sanitary napkin is overlapped with the other absorbent element materials except the absorption promoting sheet.
[0031]
(Function and effect)
According to the present invention, when an absorption promoting sheet is provided on the side facing the back surface of the liquid permeable top sheet, rapid absorption of menstrual blood that has passed through the liquid permeable top sheet into the absorbent element material is promoted by the absorption promoting sheet. The retention of menstrual blood at the surface of the liquid-permeable top sheet is reduced. Therefore, combined with the formation of the surface embossed row, the peripheral leakage is effectively prevented. At this time, the liquid permeable top sheet and the absorption accelerating sheet are integrated by surface embossing by heat fusion, so that the absorption accelerating sheet can be fixed, and the liquid permeable top is used as a means for fixing the absorption accelerating sheet. It is not necessary to use a hot melt adhesive that causes clogging of the sheet. In addition, the liquid-permeable top sheet and the absorption promoting sheet are integrated by surface embossing by heat fusion, so that menstrual blood passing through the liquid permeable top sheet is surely transferred to the absorption promoting sheet. , The speed of diffusion in the napkin deployment direction is reduced.
[0032]
<Invention of Claim 9>
Unit surface embossed area is 0.5-30mm ² The sanitary napkin according to any one of claims 1 to 7.
[0033]
(Function and effect)
Unit surface embossed area is 0.5-30mm ² Then, menstrual blood can be effectively transferred from the surface material to the absorbent element material.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the sanitary napkin according to the present invention is a daytime one having a substantially symmetric shape in the daytime or extending for the buttock side and having a shape in which the buttock side is greatly projected, and for the side part. It does not matter whether it is a so-called wing type having an overhanging wing or a non-wing type sanitary napkin having no wing. Since the thing for night use and the thing of a non-wing type sanitary napkin can be guessed by the following structure description, the revised description is abbreviate | omitted. In addition, the sanitary napkin according to the present invention can be suitably used, for example, as the above-mentioned daytime napkin, and can be suitably provided especially for "long use" having a longitudinal length of 24 to 28 cm.
[0035]
<First embodiment of sanitary napkin>
The sanitary napkin 1 according to the first embodiment of the present invention shown in FIG. 1 to FIG. 3 is a liquid-impermeable back sheet 2 made of a polyethylene sheet, a polypropylene sheet, etc. And a liquid-permeable top sheet 3 to be permeated through. Between these two sheets 2 and 3, an absorbent core 4 made of cotton pulp or synthetic pulp, and a crepe paper 5 surrounding the absorbent core 4 in order to maintain the shape of the absorbent core 4 and improve the diffusibility. The containing absorber is interposed. This absorber constitutes an absorption element material together with an absorption promotion sheet described later.
[0036]
Side nonwoven fabrics 6 and 6 formed along the longitudinal direction are provided on both sides of the surface. Note that the crepe paper 5 reaches the both ends in the longitudinal direction of the absorbent core 4 although not shown in FIG.
[0037]
Around the absorbent core 4, at the upper and lower edge portions, the outer edge portions of the liquid-impervious back sheet 2 and the liquid-permeable top sheet 3 are bonded by an adhesive such as hot melt or an adhesive means such as heat seal. In addition, the liquid-impervious back sheet 2 and the side nonwoven fabric 6 that extend laterally from the absorbent core 4 at both side edges are joined by an adhesive such as hot melt or an adhesive means such as heat seal. Has been.
[0038]
Hereinafter, the structure and materials of the sanitary napkin 1 will be described in more detail. As the liquid-impermeable back sheet 2, a sheet material having at least a water shielding property such as an olefin resin sheet such as polyethylene or polypropylene is used. However, in addition to this, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or a nonwoven fabric sheet that is substantially impervious to water through a waterproof film (in this case, the waterproof film and the nonwoven fabric are impermeable. A liquid back sheet is comprised.) Etc. can be used. 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 sheet obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. There is.
[0039]
Next, as the liquid-permeable top 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 embodiment, a porous plastic sheet on the surface side is used as the liquid-permeable top sheet 3.
[0040]
Further, an absorption promoting sheet 7 made of a thick hydrophilic nonwoven fabric is disposed between the liquid-permeable top sheet 3 and the absorbent core 4 (specifically, the crepe paper 5). The absorption promoting sheet 7 is located in the center in the longitudinal direction, extends long on the front side, and is deviated toward the front. By providing the absorption promoting sheet 7, menstrual blood, urine and the like (hereinafter collectively referred to as body fluid) can be quickly absorbed, and the surface in contact with the skin has excellent dry touch properties. It will be a thing.
[0041]
In this case, as in this example, a crepe paper 5 surrounding the absorbent core 4 is provided, so that the crepe paper 5 is interposed between the liquid-permeable top sheet 3 and the absorbent core 4 as a result. For example, the crepe paper 5 having excellent absorbability quickly diffuses body fluid and prevents reversal of these menstrual blood. Since the crepe paper 5 has a function of quickly diffusing body fluid, the crepe paper 5 constitutes the absorption promotion sheet of the present invention in an example in which the absorption promotion sheet 7 is not provided.
[0042]
On the other hand, on the upper surface of the liquid-permeable top sheet 3, side grooves 8 and 8 are formed on both sides of the blood drainage corresponding site, respectively, along the substantially longitudinal direction, and before and after the longitudinal intermediate portion. The first groove 9F and the second groove 9B are respectively formed by arc-shaped embosses extending in the width direction, and the space between the grooves 9F and 9B is a blood drainage contact portion. End grooves 10F and 10B are formed by arc-shaped embosses extending in the width direction, respectively, outside the grooves 9F and 9B in the front-rear direction and near the front and rear ends of the product.
[0043]
Further, a front leakage prevention groove 11 is formed between the first groove 9F and the end groove 10F in the front by an arc-shaped emboss extending in the width direction.
[0044]
These grooves 8, 9F, 9B, 10F, 10B, 11 are for preventing menstrual blood from the blood outlet contact portion from diffusing outward, and at least the absorbent core 4 is compressed. As long as it is squeezed in a form, there is no limitation on the form of embossing, but a form in which high-pressure parts (high-density parts) and low-pressure parts (low-density parts) appear alternately in the length direction of the grooves It can be. The embodiment also adopts the same form, and the black-painted portion in FIG. 1 indicates a high-pressure squeezed portion (high-density portion), and a space between them is a low-pressure squeezed portion (low-density portion).
[0045]
The absorbent core 4 has a middle height in the front-rear direction and the width direction, and the middle-high portion 4A is located at the center in the front-rear direction and the width direction. In the embodiment, the middle-high portion 4A is configured to extend to a position slightly beyond the groove 9F, 9B.
[0046]
The absorption promotion sheet 7 extends to the vicinity of the pre-leak prevention groove 11 beyond the groove 9F. Moreover, the liquid-permeable top sheet 3 and the absorption promotion sheet 7 are integrated with the surface absorption emboss 12 and the front unit surface emboss 13 by heat fusion. The surface absorption emboss 12 and the front unit surface emboss 13 are squeezed from the liquid permeable top sheet 3 side in a state where the liquid permeable top sheet 3 and the absorption promoting sheet 7 are overlapped, and are positioned between the grooves 9F and 9B. Is an elliptical surface absorption embossing 12, and a circular front unit surface embossing 13 is formed in a portion beyond the groove 9 </ b> F and the middle / high portion 4 </ b> A and close to the front leakage prevention groove 11. The front unit surface emboss 13 is formed along the four arc lines in the embodiment, intermittently along the arc lines extending in the width direction and with a large interval in the longitudinal direction. Since the surface absorption emboss 12 and the front unit surface emboss 13 are applied in a step before being combined with the absorption core 4, there is no deformation of the absorption core 4 and the crepe paper 5.
[0047]
The absorbent core 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 as, for example, granular powder in the pulp constituting the absorbent core. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved 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.
[0048]
On the other hand, in the unfolded state of the sanitary napkin 1, side nonwoven fabrics 6 and 6 are provided on both sides of the surface along the longitudinal direction and over substantially the entire length of the absorbent article, A part of the side nonwoven fabrics 6 and 6 is extended sideways, a part of the liquid-impervious back sheet 2 is extended sideways, and the side nonwoven fabric 6 part is extended sideways. Wing-like overhanging portions W and W are formed by joining the liquid-impermeable back sheet 2 portion with a hot melt adhesive or the like. The wing-like overhanging portions W and W are folded to the back side in the product provision stage (see FIG. 1).
[0049]
As the side nonwoven fabric 6, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used depending on the function regarded as important. 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 If a non-woven fabric is used and if the importance of menstrual blood absorption in the wing-like overhanging portions W and W is emphasized, polymerization is carried out in the presence of a compound having a hydrophilic group, such as an oxidation product of polyethylene glycol, in the synthetic fiber production process. The synthetic fiber is made to swell or become porous by applying a method such as tantalum chloride or by treating it with a metal salt such as stannic chloride, partially dissolving the surface to make it porous, and depositing metal hydroxide. A hydrophilic treated non-woven fabric that has been rendered hydrophilic is used. It is desirable to use a hydrophilic treated nonwoven fabric as the side nonwoven fabric 6. The side nonwoven fabric 6 can be made of natural fibers, synthetic fibers, regenerated fibers, or the like and formed by an appropriate processing method. Preferably, the side nonwoven fabric 6 is made air permeable with a reduced basis weight. Nonwoven fabric should be used.
[0050]
The inner portions of the side nonwoven fabrics 6 and 6 extend inward from the side edges of the absorbent core 4 and are bonded to the hot-melt adhesive on the liquid-permeable top sheet 3 in a double sheet state. The elastic members 6A, 6A such as rubber thread are bonded in an extended state by a hot melt adhesive. The longitudinal front and rear ends of the folded portion of the side nonwoven fabric 6 are bonded to each other in a superposed state with the hot melt adhesive, but the intermediate portion is not bonded. Therefore, in the state of use, as shown on the left side of FIG. 2, the folded portion is raised by the contraction force of the elastic elastic members 6A and 6A, and functions as a barrier for preventing side leakage of menstrual blood.
[0051]
(About front and rear leakage prevention means)
In the present invention, pre-leakage prevention means for preventing the transition of menstrual blood forward in the longitudinal direction from the groove 9F, that is, menstrual blood is provided.
[0052]
In the first embodiment, a pre-leak prevention groove 11 is provided as the pre-leak prevention means. The pre-leak prevention groove 11 is a groove in which a high pressing portion (high density portion) and a low pressing portion (low density portion) appear alternately in the length direction (width direction) of the groove. Further, from the liquid-permeable top sheet 3 side, the absorption promoting sheet 7, the crepe paper 5 and the absorbent core 4 are subjected to concave deformation. The liquid-permeable top sheet 3, the absorption promoting sheet 7 and the crepe paper 5 include Since the concave portion is formed, when a diffusion flow is to be generated forward beyond the front leakage prevention groove 11, the flow in the width direction becomes a flow particularly in the front leakage prevention groove 11 portion of the liquid-permeable top sheet 3. The forward flow is suppressed, and the recesses of the absorbent core 4 are dense, so that the forward flow is blocked through the absorbent core 4. Thus, pre-leakage is prevented.
[0053]
Although not shown, a rear leakage prevention groove similar to the front leakage prevention groove 11 may be provided behind the groove 9B.
[0054]
The end grooves 10F and 10B function as a front leakage prevention unit and a rear leakage prevention unit.
[0055]
The front leakage prevention means is not limited to the front leakage prevention groove 11 and the end groove 10F, but may be a flap 30 provided at the front end as shown in FIG. A substantially liquid impermeable gather sheet can be obtained by providing an elastic elastic member such as rubber thread at the tip of the sheet constituting the flap. In this kind of form, since the weir standing on the use surface side is formed, menstrual blood flowing along the surface of the liquid-permeable top sheet 3 can be prevented.
[0056]
In the front leakage prevention groove 11 or the end groove 10F, 10B, as shown in FIG. 9, the compression depth h (high pressure portion (high density portion) and low pressure portion (low density portion)) of the absorbent core 4 is If it has, the intermediate depth) is preferably 30% or more, particularly 50% or more of the thickness H of the absorbent core 4. The width Q is preferably 1 to 8 mm, particularly 2 to 5 mm. The length extending in the width direction (the straight line length in the width direction of the product) is preferably 20 to 70 mm, particularly 30 to 50 mm.
[0057]
The pre-leak prevention groove 11 can be formed as a so-called heat fusion emboss by embossing while heating from the use surface side in a state where the layers are stacked. Similarly, the heat fusion embossing can be formed with an appropriate arrangement, not as a groove. Even in this case, the area is 0.5 to 30 mm so that the bonding strength with the material on the back side can be maintained as long as the surface texture is not impaired. ² , Especially 3-20mm ² Embossing is desirable.
[0058]
(About surface embossed rows)
In the present invention, at least one of the front and rear end portions of the absorbent core indicated by Z in FIGS. 1 and 3 and having a length of 80 mm or less (which naturally includes at both ends). In which the unit surface embossing from the use surface side of the liquid-permeable top sheet 3 is 4 mm or less (more preferably 3.5 mm or less), preferably 1 mm or more with a distance D (see FIG. 4). A surface embossing row 13S is formed along a line extending in the width direction over a length range W, W of at least 10 mm to the left and right across the line CL (see FIG. 1).
[0059]
The front unit surface emboss 13, 13,... In contact with the absorbent element material Do not deform the absorbent core, or In contact with the absorbent element material The recess is formed within a range of 10% or less of the thickness of the absorbent core. More preferably, as mentioned earlier, In contact with the former absorbent element material In this embodiment, the absorbent core is not deformed.
[0060]
On the other hand, the surface embossing row | line | column 13S exhibits the front leak prevention function from a viewpoint of delaying the diffusion speed of the surface diffusion flow of the front-back direction. That is, by forming embossing on the liquid-permeable top sheet 3, the embossed concave bottom part contacts the lower member, and in the embodiment, the absorption promoting sheet 7, so that menstrual blood is absorbed better downward. As a result, the amount of menstrual blood flowing forward is reduced (diffusion speed is reduced), thereby exhibiting a pre-leak prevention function. As a method of forming the surface absorption embossing 12 and the front unit surface embossing 13, embossing can be performed using ultrasonic waves in addition to heat fusion embossing. Even in this case, the area is 0.5 to 30 mm so that the bonding strength with the material on the back side (absorption promoting sheet 7 in the embodiment) is maintained as long as the surface texture is not impaired. ² , Especially 3-20mm ² Is desirable.
[0061]
It is desirable that the surface emboss row 13S is not formed as a single unit but is formed in a plurality at intervals in the longitudinal direction as shown in the figure. In this case, the distance L between the surface emboss rows 13S and 13S shown in FIG. 4 is preferably larger than the distance D between the front unit surface embosses 13 and 13 in the width direction.
[0062]
As shown in FIG. 1, the dispersion pattern of the surface absorption embosses 12, 12... Is different from the dispersion pattern of the front unit surface embossments 13, 13. Moreover, the space | interval of adjacent surface absorption embossing 12 and 12 is formed larger than the space | interval D of front side unit surface embossing 13 and 13 along the surface embossing row | line | column 13S.
[0063]
(Other forms)
As shown in FIG. 5, since the front leakage prevention effect is enhanced by the surface embossing row 13S, the formation of the front leakage prevention groove 11 can be omitted depending on the application. Moreover, as shown in FIG. 6, formation of the end groove 10F (and / or the end groove 10B) can be omitted. Furthermore, the formation of one of the first groove 9F and the second groove 9B or both can be omitted as shown in FIG.
[0064]
The surface embossing row 13S is not limited to an arc shape, but may be a straight line shape, and as shown in FIG. 8, the shape is not limited as long as it follows a line extending in the width direction.
[0065]
(About side leakage prevention form)
As shown in FIG. 11, the unit surface embossing 14 from the use surface side of the liquid-permeable top sheet 3 is at a distance D of 4 mm or less at both left and right side portions 25 mm or less from the widthwise side edge of the absorbent core 4 of the sanitary napkin. A surface embossing row 14S is also proposed in which a surface embossing row 14S is formed along a line extending in the longitudinal direction over a length range X of at least 25 mm or more across the transverse line CW passing through the blood outlet contact center of the product. The
[0066]
As shown on the left side of FIG. 11, a plurality of surface embossing rows 14S can be formed at intervals in the width direction. Further, the space L between the surface embossing rows 14S, 14S is equal to the unit surface embossing 14, 14 mutual. It is desirable that the distance be larger than the longitudinal distance D.
[0067]
In this embodiment, it is desirable to form the side grooves 8, 8 along the longitudinal direction, but this can be omitted. When the side grooves 8 and 8 are formed, the surface embossed rows 14S and 14S are positioned outward in the width direction of the side grooves 8.
[0068]
The surface diffusion flow exceeding the surface embossed rows 14S, 14S is blocked by the menstrual blood side leakage prevention barrier formed by the folded portion of the side nonwoven fabric 6 standing by the contraction force of the elastic elastic members 6A, 6A. The Therefore, the portion functions as a side outward leakage prevention means. By forming a groove along the longitudinal direction on the outer side in the width direction of the surface embossed row 14 </ b> S, the side outward leakage prevention means may be configured.
[0069]
【The invention's effect】
As described above in detail, according to the present invention, if necessary, leakage from the peripheral portion can be effectively prevented without impairing the fit at the time of wearing. Moreover, even if it forms a groove | channel, the leakage from a peripheral part can be prevented, restricting the number as much as possible.
[Brief description of the drawings]
FIG. 1 is a development plan view from the use surface side of a sanitary napkin of the present invention.
FIG. 2 is a view taken along line 2-2.
FIG. 3 is a view taken along line 3-3.
FIG. 4 is an exploded plan view of a main part.
FIG. 5 is a main part development plan view of another example of the surface embossing configuration.
FIG. 6 is a main part development plan view of another example of the surface embossing configuration.
FIG. 7 is a development plan view from the use surface side in another example.
FIG. 8 is a development plan view of a main part in another example of the surface embossing configuration.
FIG. 9 is a longitudinal sectional view of a main part in still another example.
FIG. 10 is a longitudinal sectional view of a main part in another example.
FIG. 11 is a developed plan view from the use surface side in another example of the sanitary napkin of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid-impermeable back sheet, 3 ... Liquid-permeable top sheet, 4 ... Absorption core, 4A ... Middle-high part, 5 ... Crepe paper, 6 ... Side nonwoven fabric, 6A ... Elastic elastic member, 7 Absorption promotion sheet, 8 ... side groove, 9F ... first (front) groove, 9B ... second (rear) groove, 10F, 10B ... end groove, 11 ... front leakage prevention groove , 12 ... surface absorption emboss, 13 ... front unit surface emboss, 13S ... surface emboss row, 14 ... unit surface emboss, 14S ... surface emboss row.

Claims (9)

A sanitary napkin in which menstrual blood passing through a liquid-permeable top sheet is held by an absorbent element material including an absorbent core and leakage to the back side is prevented,
On the use surface side of the liquid-permeable top sheet of at least one end portion of the front and rear end portions of 80 mm or less from the front and rear end edges of the absorbent core,
A plurality of surface embossed rows that extend over a length range of at least 10 mm to the left and right across a longitudinal line passing through the center of contact with the blood outlet of the product along a line extending in the width direction are spaced in the longitudinal direction. Formed side by side,
Each surface embossing row is formed such that unit surface embossing that is in contact with the absorbent element material and does not deform the absorbent core or is formed of recesses of 10% or less of the thickness of the absorbent core is arranged with an interval of 4 mm or less. And
Furthermore, it extends in the width direction at least one side before and after the longitudinal direction intermediate part of the sanitary napkin, and the high-pressure squeezing part and the low-pressure squeezing part appear alternately and are squeezed at a depth of 30% or more of the thickness of the absorbent core. Anteroposterior grooves that curve toward the front and rear ends;
On the left and right of the widthwise intermediate part of the sanitary napkin, the side groove is squeezed with a depth of 30% or more of the thickness of the absorbent core extending in the longitudinal direction,
A sanitary napkin characterized in that a blood drainage contact portion is positioned between the front and rear grooves, and the surface embossed row is positioned outward in the longitudinal direction of the front and rear grooves. The sanitary napkin according to claim 1, wherein the distance between the surface embossed rows is greater than the distance between the unit surface embossed surfaces in the width direction . On the side of the liquid-permeable top sheet used on the left and right side portions of 25 mm or less from the width direction side edge of the absorbent core and on the outer side in the width direction of the side groove,
A side surface embossing row is formed that extends over a length range of 25 mm or more at least forward and backward across a transverse line passing through the blood drainage contact center of the product along a line extending in the longitudinal direction,
Each side surface embossing row is formed by arranging unit surface embossing that is in contact with the absorbent element material and does not deform the absorbent core or is formed of recesses of 10% or less of the thickness of the absorbent core with an interval of 4 mm or less. The sanitary napkin according to claim 1 or 2. The sanitary napkin according to claim 2, wherein a plurality of side surface embossed rows are formed at intervals in the width direction, and the distance between the surface embossed rows is longer than the lengthwise interval between the unit surface embosses. Haichiguchi the contact portion and the absorbent material or not deform the contact absorbent core or absorbent element material on the contact surface absorbs embossed to form recesses in the range of 10% or less of the thickness of the absorbent core is dispersed The sanitary napkin according to claim 1 or 2, wherein a large number are formed. The sanitary napkin according to any one of claims 1 to 5, wherein in the region where the absorbent core is present, outward leakage prevention means is provided outward from the product from the surface embossed row. The sanitary napkin according to claim 6, wherein the outer leakage preventing means is a groove that is squeezed at a depth of 30% or more of the thickness of the absorbent core along a direction intersecting the inner and outer directions. The absorbent element material has an absorption promoting sheet on the side facing the back surface of the liquid permeable top sheet, and the liquid permeable top sheet and the absorption promoting sheet are integrated by surface embossing by heat fusion. The sanitary napkin according to any one of claims 1 to 7, wherein the sanitary napkin is overlapped with the other absorbent element materials except the absorption promoting sheet. Sanitary napkin according to any one of claims 1 to 7 area of the unit surface embossing is 0.5 to 30 mm ^2.

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