JP2007117117A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article achieving both softness and twist resistance. <P>SOLUTION: The absorbent article has a thickness of 1.0-2.0 mm, a Gurley stiffness of 0.3-0.9 mN/25 mm in the longitudinal and transverse directions, and a WC (compression rigidity) value of ≥1.2 N/m, a RC (compression recovery) value of ≥50% and a bending hysteresis 2HB (bending recovery) of ≤0.8×10<SP>-2</SP>N/m in KES measurement. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an absorbent article, and more specifically, to an absorbent article having both physical properties of softness and difficulty.

Absorbent articles used by women attached to underwear may cause bending due to external forces such as bending or twisting caused by the wearer's movement during wearing, resulting in `` bending ''. It was a problem. In particular, thin panty liners and the like are prone to this “smoothness”, and various sheets have been proposed in order to prevent “smoothness”. For example, in the sheet for absorbent articles described in Patent Document 1, a sheet having a high recovery force in the CD direction, which is a direction perpendicular to the fiber orientation direction, specifically, a CD recovery force of 0.7 cN or more and a compressive strength By incorporating a sheet of 100 cN or less into the absorbent article, it is possible to effectively prevent twisting in the surface direction. In addition, the body fluid absorbing material described in Patent Document 2 is composed of a cellulosic fiber as a surface material that comes into contact with the skin, is highly resistant to rashes, and has excellent moisture absorption.
JP 2001-238910 A Japanese Patent No. 3200673

  However, although the absorbent article sheet described in Patent Document 1 has a resilience and is effective as a countermeasure against twisting, it has a strong repulsion such as an upper limit of compressive strength of 100 cN and gives a firm feeling of wearing. Will harm you. And since it has such a physical property, the intensity | strength of sheet | seat itself is strong during use, and especially softness and softness | flexibility important for thin absorbent articles like a panty liner cannot be expressed. In addition, because some of the components are highly rigid, it is difficult to fit along the wearer's body line (curve) as a whole sheet for absorbent articles, leaving the feeling of being used in use and comfortable. Not.

  Moreover, although the cotton fiber is mentioned as a surface material of patent document 2, as for the fiber diameter of a cotton fiber, 3 dtex is common and the surface material is comprised by the spunlace manufacturing method. The cotton spunlace nonwoven fabric configured in this way has a squeaky feeling in itself and is not soft to the touch.

  The present invention solves the above-described conventional problems, and an object thereof is to provide an absorbent article that achieves both an effect on twist and a good touch.

  In order to solve such a problem, the present inventors used a sheet having a high twist preventing effect and a good touch on the surface material, and also used an absorbent body and a back material that do not impair the softness. Specifically, the absorptive article as a whole has a structure in which predetermined physical properties, that is, thickness, Gurley rigidity, compression stiffness, bending rigidity, and compression recovery property of the KES method are within a predetermined range, thereby solving the above problems. Furthermore, the top sheet as the surface material is provided with hydrophobicity so that the hydrophilicity is lower than that of the absorbent sheet as the absorber, so that the anti-reverse effect is provided. More specifically, the present invention provides the following.

  (1) An absorbent article capable of absorbing a substantially vertically long body fluid having a longitudinal direction and a lateral direction, and having a thickness dimension of 1.3 mm to 2 mm, and a Gurley in the longitudinal direction and the lateral direction An absorbent article having a stiffness value of 0.3 mN / 25 mm to 0.9 mN / 25 mm.

  The absorbent article (1) has an appropriate thickness that does not give "anxiety that it is too thin" or "an unpleasant feeling that it is thick" especially when used as a panty liner. Moreover, since the rigidity value is 0.3 mN / 25 mm or more, it does not hang down when the absorbent article is picked up, and does not cause a problem when worn on underwear such as shorts. In this respect, if the rigidity value is less than 0.3 mN / 25 mm, the rigidity of the absorbent article is remarkably lowered, and it makes the wearer feel unreliable when the wearer holds it. Further, in the present invention, the rigidity is as low as 0.9 mN / 25 mm or less at the maximum, so when wearing, it will be deformed in synchronization with the underwear along the body line, and the absorbent article is used. It does not give a strong sense to the wearer and can be used comfortably.

(2) WC (compression stiffness) value in KES measurement is 1.2 N / m or more, RC (compression recovery) value is 50% or more, bending hysteresis 2HB (bending recovery property) is 0.8 × 10 ⁻² N / The absorbent article of (1) which is m or less.

  Since the absorbent article (2) has a high compression recovery property of 50 or more, it has a restoring property. For this reason, even when the absorbent article is deformed along the wearer's body at the time of use, the absorbent article is deformed away from the body, such as when the wearer lowers the underwear with the absorbent article attached. When released from the state, it can return to its original shape. That is, since the deformed state can be corrected by simply lowering the underwear, it is possible to prevent the wearer from continuing wearing with a twist or deformation, and when the absorbent article is replaced, the absorbent article after wearing is in a twisted state. Can be reduced. In this regard, looking at an absorbent article that has been twisted makes a woman feel like a messy and very disgusting woman, but according to the present invention, It is less likely to cause psychological adverse effects by looking at the absorbent articles that are distorted. Moreover, since the bend recovery property is 0.8 or less and it is easy to bend when bent, even if it is in a deformed state, twisting is unlikely to occur in the first place.

  Moreover, since the WC value is 1.2 N / m or more, the thickness of the absorbent article is easily deformed with a small force, and the amount of change in the thickness of the absorbent article when touched is large. For this reason, even if the thickness is 1.5 mm or more and the same as the conventional product, the wearer feels soft when he / she holds the absorbent article of the present invention. Thus, since the absorbent article of the present invention is easily compressed and has physical properties that easily return to its original shape even when compressed, a soft cushion feeling is expressed.

(3) The absorbent article includes a liquid-permeable top sheet disposed on the side in contact with the skin of the wearer during use, a liquid-impermeable back sheet disposed on the side in contact with the clothes, and the tops. An absorbent sheet interposed between the sheet and the back sheet, and the total weight of the top sheet, the back sheet, and the absorbent sheet is 70 g / m ² to 110 g / m ² (1 ) Or (2).

According to the absorbent article of (3), the overall basis weight is in the above range. That is, in the case of a three-layer structure of a top sheet, a back sheet, and an absorbent sheet, the total weight per unit of all of them is within the above range, and an unnecessary hard feeling is given to the wearer. There is no. In this regard, if the upper limit is 110 g / m ² , the Gurley rigidity value is not 0.9 mN / 25 mm or less, and it is difficult to bend, resulting in an absorbent article that impairs comfortable use. In addition, there is a problem that the material cost increases when the basis weight increases. In this regard, according to the present invention, since the basis weight is not increased more than necessary, the performance such as softness and flexibility is improved although the basis weight is lower than that of the conventional product. Will be.

(4) The absorbent article according to any one of (1) to (3), wherein the top sheet has a winder finished thickness of 2.0 mm or more when loaded with 3 g / m ² .

  According to the absorbent article of (4), the thickness when the thickness is the thickest in the manufacturing process is the above thickness. For this reason, the thickness of the absorbent article can be increased to 1.5 mm or more by applying heat.

  (5) The absorbent article according to (4), wherein the top sheet is a sheet in which hydrophilic and hydrophobic fibers are mixed at a ratio of 20:80 to 100: 0, or includes the sheet.

  According to the absorbent article of (5), the top sheet contains hydrophobic fibers. For this reason, hydrophilicity becomes low and it is hard to hold | maintain a liquid on the surface, and it can make Klem water absorption power lower than an absorption sheet. Therefore, when the body fluid adheres to the top sheet, the body fluid can be quickly transmitted to the absorbent sheet having a high hydrophilicity. In addition, even if the absorbed and retained body fluid returns to the top sheet, both the hydrophilicity gradient and the gravity must be countered. Therefore, the return of body fluid is prevented.

  (6) The top sheet is composed of two layers of a skin contact layer and a cushion layer having different hydrophilicities, and the skin contact layer has a lower hydrophilicity than the cushion layer (4) or (5) The absorbent article as described.

  According to the absorbent article of (6), the liquid-permeable top sheet consists of two layers, and the skin contact layer on the surface side and the cushion layer on the absorbent sheet side so that the body fluid moves toward the absorbent sheet. Has been placed. For this reason, the hydrophilicity gradient between the top sheet and the absorbent sheet becomes skin contact layer <cushion layer <absorbent sheet, and body fluid can easily shift from the skin contact layer to the absorbent sheet through the cushion layer. On the other hand, even if the body fluid absorbed and retained by the absorbent sheet returns to the skin contact layer, the body fluid must be countered against the three-step hydrophilicity gradient and also against gravity, so that the body fluid is prevented from returning. ing.

  (7) The absorbent article according to (6), wherein the skin contact layer has a fiber thickness of 3 dtex or less, more preferably 1 dtex to 2.6 dtex.

  According to the absorbent article of (7), the skin contact layer is suitable for being in direct contact with the skin and has a good feel to the skin. That is, when the body fluid adheres, it has both hydrophilicity that quickly permeates the lower layer and leaves no liquid on the surface, and good skin feel. For this reason, the touch when touched is good, and a wearer is reminded of the gentleness as an absorbent article used for a delicate part of a woman. As a fiber which comprises such a sheet | seat, it is a thermoplastic fiber and the length of 30 mm-50 mm is preferable.

  (8) The absorbent article according to (5) or (6), wherein the cushion layer has a fiber thickness of 1.7 dtex or more and 4.4 dtex or less.

  According to the absorbent article of (8), the cushion layer does not become hard, and the role as a cushion for improving the wearing feeling is surely achieved. For this reason, it has the function to draw in the bodily fluid which permeate | transmitted from the skin contact layer into the absorption sheet located in a lower layer, and the function which improves a feeling of wear. In addition, in order to maintain a skeletal structure densely, it is preferable that the length of the fiber which comprises such a sheet shall be 30 mm-50 mm.

  The absorbent article according to the present invention as described above, particularly as a panty liner, has a suitable thickness that does not give the wearer a sense of anxiety of absorption and is comfortable to use, and it is difficult to wear and feel when worn. It has become a good balance between the good.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a skin side surface of a panty liner which is an absorbent article according to the present invention, FIG. 2 is a cross-sectional view taken along the line XX ′ of FIG. 1, and FIG. FIG. 4 is a diagram illustrating a production line for restoring the top sheet base material with heat, FIG. 4 and FIG. 5 are diagrams for explaining samples for evaluation tests, and FIG. 6 is a diagram for explaining an evaluation method.

<Overall configuration of absorbent article>
The panty liner 1 is a thin sheet for absorbing and holding bodily fluids (clay, sweat, urine, menstrual blood) excreted from the body when worn on the underwear. As shown in FIG. 2, the panty liner 1 is composed of three sheets, a top sheet 10, a back sheet 20, and an absorbent sheet 30 sandwiched between the two sheets.

  The sheets are bonded with an adhesive (hot melt). Further, a hot emboss seal 40 is applied to a portion inside (2 mm inside in the present embodiment) from the peripheral edge of the panty liner 1 in order to prevent the top sheet 10 and the back sheet 20 from being peeled off during use. ing. The heat embossed seal 40 compresses the sheet constituting the panty liner 1 with heat, and thus has a high density and is hard. For this reason, if it is applied to the outermost part, it may rub against the wearer's crotch during wearing, which may cause the wearer to feel uncomfortable or damage the rubbed part. It is preferable.

Further, an adhesive 50 (hot melt) for fixing the panty liner 1 to the underwear is applied to the back surface side (underwear side) of the back sheet 20. In this embodiment, eight rubber hot melts coated with a basis weight of 35 g / m ² to a width of 3 mm and a length of 115 mm are applied at equal intervals of 2 mm.

[Heat embossing]
In the stage of manufacturing the panty liner 1, the composite sheet base material in which the respective sheets are overlapped and joined has a distance of 1.5 mm from the skin side surface of the top sheet 10 to the absorbent sheet 30. . For this reason, the function of transferring body fluid to the absorbent sheet 30 has been lost. Therefore, in order to smoothly transfer the body fluid to the absorbent sheet 30 (to reduce the distance between the skin side surface and the absorbent sheet), heat emboss 41 is applied as shown in FIG.

  The hot emboss 41 may be applied only to the top sheet 10 or may be applied so that the top sheet 10 and the absorbent sheet 30 are integrated. In this respect, in this embodiment, in order to improve the absorbability by bringing the top sheet 10 and the absorbent sheet 30 into contact, the top sheet 10 and the absorbent sheet 30 are integrated at 120 ° C./120° C., a pressure of 20 kg, The hot emboss 41 is given in 0.1 second.

  In the present invention, the temperature of the hot emboss 41 is preferably set to a temperature of the melting point of a fiber having a low melting point of −5 ° C. or less among the fibers used in the top sheet 10. When the temperature is higher than this temperature, the fibers shrink and become hard due to heat, and the touch becomes worse.

  Since the shape of the hot emboss 41 is high in rigidity in the longitudinal direction of the panty liner 1, the shape of the hot emboss 41 is in a direction perpendicular to the direction (short direction). Further, the length of the hot emboss 41 in the longitudinal direction is 3 mm, the length in the short direction is 0.8 mm, the distance in the longitudinal direction is 8 mm, and the distance in the lateral direction is 11 mm. The hot emboss 41 is staggered and applied to the entire top sheet 10. By applying such heat embossing 41, the heat embossing 41 is applied in a non-parallel condition with respect to the direction of strong rigidity, so that the rigidity of the entire panty liner 1 can be reduced.

  In the present embodiment, the area ratio of the heat emboss 41 is 4.14%. In addition, as an absorbent article which concerns on this invention, it is preferable to design the total area of a heat | fever embossing 1 to 50%, and the size of one embossing by the magnitude | size of 1 to 15 mm piece each length and breadth. Examples of the shape of the emboss include an ellipse, a rhombus, and a rectangle. It is desirable that the longitudinal direction of the hot emboss is not parallel to the direction in which the sheet has high rigidity. Further, it is desirable that the sheet has an intermittent shape rather than continuous embossing that crosses the sheet in the lateral direction. This is because continuous hot embossing causes a region having a high density in the direction to continuously exist, and increases the rigidity of the entire absorbent article. In addition, as for the space | interval of the front and back, right and left of a hot embossing, it is desirable to take the distance of 2 times or more of the thickness of the member which performs a hot embossing. This is because if the gap is not kept longer than this, the sheet member is pulled in front, rear, left, and right when hot embossing is performed, and the thickness is reduced. For example, when the thickness of the state in which the top sheet and the absorbent sheet are bonded is 3 mm, the heat emboss interval is at least 6 mm.

[size]
As the size of the absorbent article according to the present invention, such an absorbent article is used by attaching it to underwear, and even when the attaching position is slightly shifted, it can be individually adapted to the wearer's genitals. Desirably, the size should cover the average genital size. Specifically, the length in the longitudinal direction is preferably 50 to 220 mm, the length in the short direction is 20 to 60 mm, and the maximum width portion is preferably 30 to 90 mm. The panty liner 1 of the present embodiment has a length in the longitudinal direction of 140 mm, a length in the short direction is 44 mm at the narrowest portion located at both ends in the longitudinal direction, and a length of 54 mm at the maximum width portion. ing.

[Top sheet]
The top sheet 10 is composed of two layers, a skin contact layer 11 and a cushion layer 12. The skin contact layer 11 quickly permeates the liquid so as to improve the feeling of contact with the skin and does not leave body fluid on the surface. The cushion layer 12 improves the feeling of wearing, and the absorbent sheet 30 It is intended to draw body fluids. Since the top sheet 10 transfers body fluid to the lower absorbent sheet 30, the water absorption power of the clem is lower than that of the absorption sheet 30. Specifically, the water absorption power of the clem is such that the skin contact layer 11 <cushion layer 12 < It has become.

As a material of such a top sheet 10, fibers (for example, having a core-sheath structure) using thermoplastic resins such as polyethylene, polypropylene, polyester, nylon, polyamide, or the like alone or in combination, or a combination of a plurality of resins are used. And the like are 20 through 80 g / m ² produced by laminating such fibers), fusing the fibers with hot air, and joining these fibers at the fiber joining point.

[Concrete materials]
The top sheet 10 in the present embodiment uses a through-air nonwoven fabric having a basis weight of 35 g / m ² and a winder finished thickness of 3.0 mm when loaded with 3 g / cm ² . This nonwoven fabric has a thickness at the time of base roll of 0.7 mm when loaded with 3 g / cm ² , and after passing through a heat roll described later, it becomes 1.8 mm when loaded with 3 g / cm ² . Specifically, the skin contact layer 11 has a fiber length of 2.2 dtex, a thickness of 45 mm, a generally hydrophilic fiber (“ETC” manufactured by Chisso Corporation), and a fiber length of 2. 2 dtex, 45 mm thick and weakly hydrophobic fiber (“ESC” manufactured by Chisso Corporation) mixed at 50:50, and has a fiber structure with a basis weight of 27 g / m ² . In addition, the cushion layer 12 has a fiber length of 2.6 dtex, a thickness of 45 mm, a generally hydrophilic fiber (“ETC” manufactured by Chisso Corporation), a fiber length of 2.6 dtex, and a thickness of It is a fiber structure of 45 g and durable hydrophilic fibers (“ESC” manufactured by Chisso Corporation) mixed at a ratio of 50:50 and having a basis weight of 8 g / m ² .

〔Production method〕
When manufacturing the top sheet 10, the thickness of the winder finish is maintained at 3 g / cm ² and 2.0 mm or more (Y value) at the time of loading by adjusting the amount of hot air and the nip condition of the processing machine. Is preferred. By doing in this way, it becomes easy to restore the thickness of the top sheet 10 in the manufacturing process of the panty liner 1. Thereafter, when the top sheet base material is rolled through a slitting process or the like, the sheet thickness is 50% or less of the Y value. .3 seconds or more, the bulk is recovered to 70% of the Y value, and it is used as the top sheet 10 of the panty liner 1.

  Two heat rolls having a diameter of 200 mm are used, but a production line is made so that the top sheet substrate 100 is S-shaped. At this time, in order to lengthen the area and time in contact with the hot roll as much as possible, as shown in FIG. 3, the top sheet substrate 100 passes from the lower right of the roll R-1 to the upper left of the roll R-2. Make a line. More preferably, in order to maintain the bulk of the topsheet base material 100 whose volume has been increased by heat, it is desirable to apply cold air of 30 ° C. or less at the portion S-1 after finishing the hot roll process. In addition, as a method of raising the bulk of the top sheet base material 100, a method of applying hot air instead of passing a hot roll as described above may be used.

  In the processing step of applying heat as described above, the thickness of the base material of the top sheet is 1.5 mm or more, and in this state, the top sheet is fixed to the absorbent sheet base material using an adhesive.

[Absorption sheet]
The absorbent sheet 30 may be a porous or non-porous nonwoven fabric or pulverized pulp. Examples of the method for producing the nonwoven fabric include a wet or dry spunlace method and a through-air method. As fibers to be used, cellulose fibers (cotton, wool, etc.), chemical fibers (rayon), synthetic fibers (polyethylene fibers), etc. can be used alone or in combination of two or more. Moreover, it is good also as the airlaid pulp which laminated | stacked the pulp with the adhesive agent, and the airlaid pulp which laminated | stacked the pulp and the said fiber with the adhesive agent. Each fiber may contain superabsorbent particles.

[Specific configuration]
In the absorbent sheet 30 in the present embodiment, rayon and polyester are blended at a ratio of 90:10 in order to make the body fluid of the top sheet 10 more easily transferred to the absorbent sheet by making it more hydrophilic than the top sheet 10. A wet spunlace nonwoven fabric having a basis weight of 25 g / m ² is used.

[Back sheet]
The back sheet 20 is a liquid-impermeable sheet for preventing the absorbed body fluid from permeating by the underwear. For this reason, a plastic film made of a material such as polyethylene, polypropylene, and cellophane can be used. However, it is preferably a gas-impermeable and liquid-impervious plastic film, and more preferably an SMS (spun span) using polypropylene as a main material. Bond, melt blown, spun bond), SMS / MB / SMS and other non-woven fabrics with high water resistance. When such a non-woven fabric is used, it has very high moisture permeability and can prevent not only bleeding of body fluids but also a feeling of stuffiness due to staying of heat and regular (humidity) during use. In addition to the above, a laminated nonwoven fabric in which a nonwoven fabric is laminated on a plastic film made of a material such as polypropylene or cellophane may be used.

[Characteristics of the panty liner of this embodiment]
The panty liner 1 using the above-described top sheet 10, absorbent sheet 30, and back sheet 20 has the following characteristics.

[Product thickness]
When the load is 3 g / cm ^2, the thickness of the absorbent article is 1.3 to 2 mm, more preferably 1.5 mm to 1.8 mm. If it is 1.3 mm or less, the panty liner 1 feels thin when it is held in the hand, giving anxiety about absorbability. On the other hand, if it is 2 mm or more, the panty liner 1 will feel thicker, giving the wearer a feeling of wearing during use and a feeling of being stiff. If it is the range of the above-mentioned thickness in this point, it will become moderate thickness as a panty liner. This time, since the thickness is 1.8 mm when loaded with 3 g / cm ² , the thickness is suitable.

[Gurley rigidity]
When a test piece having a center portion of the panty liner 1 cut at a length of 38 mm and a width of 25 mm is prepared in the longitudinal direction (MD direction) and the lateral direction (CD direction) and measured using a stiffness tester. Is preferably 0.3 to 0.9 mN / 25 mm in each of the longitudinal direction and the lateral direction. This sample is 0.78mN / 25mm in the longitudinal direction and 0.5mN / 25mm in the lateral direction, so it is easy to deform along the body line and is easy to wear. Yes.

[Compression recovery]
When the compression resilience (recoverability (RC)) is 50% or more when the compression characteristics are measured using a compression measuring instrument, it is in a pressurized state and is easily recovered when released from the pressure. Therefore, it is preferably 55% or more. In this embodiment, the shape is easily recovered because of 61.05%.

[Compression rigidity]
The compression rigidity (WC) when the compression characteristics were measured using a compression measuring instrument was 1.533 N / m. When the compression rigidity is 1.2 or more N / m, it becomes a characteristic of being easily compressed, and since the change in thickness compressed with a small load is large, the wearer feels soft. In this respect, in this embodiment, since it is 1.2 N / m or more, it has preferable softness.

[Bending recovery]
The bending property (KES (2HB) bending hysteresis (recoverability)) in the longitudinal direction of the panty liner 1 using a bending tester was 0.4340 N / m. When the value of the bending hysteresis is large, the characteristic is not recoverable, and the effect of preventing twisting is low, so that it is preferably 0.8 N / m or less. In this respect, the present embodiment has a preferable recoverability because it is 0.8 N / m or less.

[Evaluation methods]
A method for evaluating the above characteristics will be specifically described.

[Gurley rigidity]
The instrument used was Yasuda Seiki Ltd. Gurley's Stiffness Tester is used. The procedure is as follows: (1) The separator is peeled off, and the sticker roll is attached to the adhesive surface of the adhesive on the back sheet. (2) As shown in FIG. 4, the sample 60 in the horizontal direction (short direction) and the vertical direction (longitudinal direction) of the panty liner 1, the length of the arrow W as shown in FIG. Is cut to 38 mm and collected at N = 5. In addition, a sample uses the part without a wrinkle of the panty liner 1, and cuts it with scissors. (3) Set in the instrument 63 so that L1 of 6.3 mm in length located at the upper end of the sample is located at the upper end of the chuck as shown in FIG. In this case, the pendulum 64 is applied to L2 having a length of 6.3 mm located at the lower end of the sample 60. (4) Attach an auxiliary weight so that the memory is between 3 and 6. (5) Press the switch and read the scale at the moment when the rotating rod of the pendulum 64 leaves the sample 60. (6) Measure the LEFT and RIGHT of the device. (7) Measure 3 samples.

  The calculation method calculates the average value of LEFT and RIGHT for each of the vertical and horizontal directions. In the present embodiment, the calculation is performed according to the following formula. Note that. The position of the place where the weight is put is i for the first inch, ii for the second inch, and iii for the fourth inch.

[Compression recovery (RC value) and compression rigidity (WC)]
KATO TECH CO. Using “KES-FB3 AUTO-A” manufactured by Ltd., the following procedure is used. First, (1) the separator is peeled off, and the cigar roll is attached to the adhesive surface of the adhesive of the back sheet. (2) Set the sensor terminal so that it is positioned at the center of the panty liner 1. (3) Set the panty liner 1 created as described above, operate according to the instructions attached to the equipment, and immediately press the start switch to quickly perform initial setting (gap setting) and automatically measure compression (RC , WC value). (4) Three samples are measured.

[Bending recovery (2HB value)]
KATO TECH CO. Using “KES-FB2 AUTO-A” manufactured by Ltd., the following procedure is used. First, (1) the separator is peeled off, and the cigar roll is attached to the adhesive surface of the adhesive on the back sheet. (2) Set so that the center part of the panty liner 1 is located at a fulcrum that bends. (3) Set the panty liner 1, operate the KES-EB2 AUTO-A according to the instructions attached to the equipment, and press the start switch to automatically clamp (clamp) and maintain a certain curvature (maximum curvature) K = ± 2.5 cm −1) and bending recovery (2HB value) is measured. (4) Three samples are measured.

  Table 1 shows the measured physical properties of the first embodiment described above as Example 1, other Examples 2 to 4 of the present invention, and Comparative Examples 1 to 3 as comparative examples.

In Examples 1 to 3, the top sheet is composed of two layers, a skin contact layer and a cushion layer, and the total weight of the two layers is 35 g / m ² . On the other hand, Example 4 has only the skin contact layer, but the basis weight is 35 g / m ² alone. In addition, the basis weight of the entire product is 100 g / m ² or less. On the other hand, the comparative examples 2 and 3 have a thin top sheet weight of 20 g / m ² and do not have cushioning properties. On the other hand, the basis weight of the entire product greatly exceeds 100 g / m ² .

[Fiber used]
“ETC” used in Example 1 is a product of Chisso Corporation, which is a core-sheath fiber, the core part is made of PET (polyethylene terephthalate), and the sheath part is made of PE (polyethylene). . “ESC” used in both Example 1 and Example 2 is a product of Chisso Corporation and is a core-sheath fiber, the core is PP (polypropylene), and the sheath is PE (polyethylene). ). “AJS” used in Example 3 and Example 4 is a product name fiber of Toyobo Co., Ltd., which is a hollow fiber, having a hollow core part with PET at the outer part and PP at the outermost part. Is arranged and configured. “ARH” used in Examples 3 and 4 is a product of Toyobo Co., Ltd., and the core is made of PET and the sheath is made of PP. "FMS" used in Example 3 is a product of Toyobo Co., Ltd., which is composed of PET with the core portion being offset from the center, and the sheath portion is compressed with heat composed of PE. It is a latent crimped fiber that is easy to do. “ARS” used in Example 4 is a product of Toyobo Co., Ltd., which is a core-sheath fiber, in which the core is made of PET and the sheath is made of PE.

[Conventional product]
The conventional product 1 is a non-woven fabric of the spunlace manufacturing method using 100% natural cotton for the top sheet to improve the surface feel, and the conventional product 2 is used for the top sheet to improve the absorbency. A thin-through nonwoven fabric using airlaid purple as the absorbent sheet. Conventional product 3 is a state in which tissue with a basis weight of 60 gsm is folded in three (high rigidity) to improve absorbability. Is an absorbent sheet.

  Conventional products 1 and 2 have a lateral Gurley stiffness value, and conventional product 3 has a longitudinal Gurley stiffness value higher than 0.9 mN / 25 mm, which is the upper limit of the preferred range of the present invention. For this reason, it is difficult to be deformed in synchronism with the underwear when worn, giving a feeling of use. Moreover, as for the conventional product 2, RC and WC are smaller than the suitable minimum of this invention. For this reason, deformation and resilience are poor and twisting cannot be effectively prevented. Further, Conventional Example 3 is easy to twist because the bending stiffness of KES is higher than the upper limit indicated by the present invention.

It is a top view of the panty liner of a 1st embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line X-X ′ in FIG. 1. It is a figure which shows the manufacturing line of the said panty liner which restore | restores a top sheet base material with a heat | fever. It is a figure for demonstrating how to take the sample at the time of evaluation. It is a figure for demonstrating the magnitude | size of the sample at the time of evaluation. It is a figure for demonstrating the evaluation method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Panty liner 10 Top sheet 11 Skin contact layer 12 Cushion layer 20 Back sheet 30 Absorption sheet 40 Hot emboss seal 41 Hot emboss 50 Adhesive 100 Top sheet base material

Claims (8)

An absorbent article capable of absorbing a substantially vertically long body fluid having a longitudinal direction and a transverse direction,
An absorbent article having a thickness dimension of 1.3 mm to 2 mm and a Gurley rigidity value of 0.3 mN / 25 mm to 0.9 mN / 25 mm in the longitudinal direction and the short direction. WC (compression stiffness) value in KES measurement is 1.2 N / m or more, RC (compression recovery) value is 50% or more, bending hysteresis 2HB (bending recovery property) is 0.8 × 10 ⁻² N / m or less. The absorbent article according to claim 1. The absorbent article includes a liquid-permeable top sheet disposed on the side in contact with the skin of the wearer during use, a liquid-impermeable back sheet disposed on the side in contact with the clothing, and the top sheet and the back. Consisting of an absorbent sheet interposed between the sheet and
The absorbent article according to claim 1 or 2, wherein a total basis weight of the top sheet, the back sheet, and the absorbent sheet is 70 g / m ² to 110 g / m ² . The absorbent article according to any one of claims 1 to 3, wherein the top sheet has a winder finish thickness of 2.0 mm or more when loaded with 3 g / m ² .   The absorbent article according to claim 4, wherein the top sheet is made of a sheet in which hydrophilic and hydrophobic fibers are mixed at a ratio of 20:80 to 100: 0 or includes the sheet.   The said top sheet | seat consists of two layers of the skin contact layer and cushion layer from which hydrophilicity differs, The said skin contact layer is a thing whose hydrophilicity is lower than the said cushion layer. Absorbent article. The absorbent article according to claim 6, wherein the skin contact layer has a fiber thickness of 3 dtex or less.   The absorbent article according to claim 6 or 7, wherein the cushion layer has a fiber thickness of 1.7 dtex or more and 4.4 dtex or less.

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