JP2017042228A - Top sheet and absorbent article using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a top sheet that is improved in hardness and texture, is superior in breathability and absorption velocity while holding the advantage due to shaping processing, and provide an absorbent article using the same.SOLUTION: A top sheet is a shaping composite sheet in which a first top sheet is convexly shaped in the skin abutment surface side in cross section view, and partially bonded in a bonding part between the second top sheet and a predetermined pattern. The top sheet has a thickness of 1.3 times or more and 2.0 times or less under a load of 0.25 gf/cm, a thickness of 1.5 times or more and 2.0 times or less under a load of 35 gf/cm, the air permeability of 1.5 times or more and 2.0 times or less, a total value of 3-times of the repetitive absorption velocity of 2/3 or less, a fluid return amount of 1/3 or less, the air permeability of 3 cm/cm/s or more and 6 cm/cm/s or less and a contact cold/hot feeling evaluation value of 0.05 J/cmor less, to an unprocessed laminated sheet. The top sheet is smaller than the contact cold/hot feeling evaluation value of the laminated sheet, and the difference is 0.04 J/cmor more.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a top sheet and an absorbent article using the top sheet.

  In general, absorbent articles such as light incontinence pads, urine-absorbing pads, disposable diapers, sanitary napkins, etc. are disposed between a liquid-permeable top sheet, a liquid-impermeable back sheet, and both sheets. And an absorber. Thereby, body fluids, such as urine, are absorbed by an absorber through a top sheet, and do not leak outside by a back sheet. The top sheet of such an absorbent article is required to have a soft touch before absorption of bodily fluids, and after absorption, bodily fluids do not reverse and do not give a serious discomfort.

  Therefore, in order to improve the surface feel and the dryness after absorption, the surface of the top sheet is subjected to a shaping treatment to give a three-dimensional uneven pattern. For example, Patent Document 1 discloses an absorbent article that includes a top sheet that is shaped into a predetermined concavo-convex shape on the upper layer of two upper and lower layers of nonwoven fabric and laminated and joined. Further, Patent Document 2 discloses an absorption in which an upper layer and a lower layer are partially bonded to a surface (top) sheet having upper and lower two-layer sheets to form an uneven shape, and the uneven shape and the arrangement of the joints are defined. A top (top) sheet for a functional article is disclosed. Furthermore, Patent Document 3 has a top sheet composed of two upper and lower layers, has a convex portion that protrudes toward the upper layer while holding a cavity between the two layers, and has an upper layer and a lower layer. Absorbent articles having different fiber lengths are disclosed.

JP 2003-275239 A JP 2004-174234 A JP 2009-131593 A

  However, in order to improve the feel of the surface and the dryness after absorption, if a plurality of base materials constituting the top sheet are subjected to a shaping process and a large number of parts are joined, the top part is caused by the joined part. In some cases, the sheet hardened and the touch decreased. Moreover, since the density of the base material of a junction part becomes high, the fall of the ventilation performance and absorption performance of a top sheet was inevitable.

  In view of the above-described problems, the present invention provides a top sheet and an absorbent article using the top sheet that have improved hardness and feel, excellent breathability and absorption speed, while maintaining the advantages of performing the shaping process. The purpose is to provide.

The present invention is grasped by the following composition in order to achieve the above-mentioned object.
(1) One aspect according to the present invention is a top sheet of an absorbent article, the first top sheet, and a second top sheet provided closer to the non-skin contact surface than the first top sheet. A shaped composite sheet in which the first top sheet is shaped in a convex shape on the skin contact surface side in a cross-sectional view and is partially joined to the second top sheet at a joining portion of a predetermined pattern. The ratio of the shaped composite sheet to the laminated sheet obtained by laminating the unprocessed first top sheet and the unprocessed upper second top sheet is 1.3 times or more under a load of 0.25 gf / cm ^2. 2.0 times or less thickness, 35 gf / cm ² under load, 1.5 times to 2.0 times thickness, 1.5 times to 2.0 times air permeability, 2/3 or less The total value of the repetition absorption rate for 3 times and the liquid return of 1/3 or less Has, above the shaped composite sheet ^has a 3cm 3 / ^cm 2 / s or more ^6cm 3 / ^cm 2 / s or less air permeability, and 0.05 J / cm ² or less of contact cold feeling evaluation value, the The contact cold / warm feeling evaluation value of the shaped composite sheet is smaller than the contact cold / warm feeling evaluation value of the laminated sheet, and the difference is 0.04 J / cm ² or more.
(2) In the configuration of (1), the first top sheet and the second top sheet may be a thermal bond nonwoven fabric having a basis weight of 15 g / m ² or more.

  (3) One aspect according to the present invention is an absorbent article, which is a liquid-permeable top sheet having the configuration of (1) or (2), a liquid-impermeable back sheet, and the top. An absorbent body disposed between the sheet and the back sheet.

  According to the present invention, it is possible to provide a top sheet and an absorbent article using the top sheet that are improved in hardness and touch, excellent in air permeability and absorption speed, while maintaining the advantages of performing shaping. it can.

It is the expanded view which looked at the absorptive article concerning this embodiment from the top sheet side. It is a schematic sectional drawing of the absorbent article in the AA line of FIG. It is the top view which looked at the top sheet of the area | region shown by P of FIG. 2 from the skin contact surface side. FIG. 4 is a schematic cross-sectional view of a top sheet taken along line BB in FIG. 3.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment. In the description of the present specification, the time when the absorbent article 1 is worn means at least one of the time when the absorbent article 1 is worn and after wearing. The longitudinal direction of the absorbent article 1 is a direction extending before and after the wearer when the absorbent article 1 is worn, and is a direction indicated by a symbol Y in the figure. Moreover, the transversal direction of an absorbent article is a direction which is transverse or orthogonal to the longitudinal direction, and is a direction indicated by a symbol X in the figure. Furthermore, the skin contact surface is a surface that is disposed on the wearer's skin side during wearing among the front and back surfaces of each member such as the absorber, and the non-skin contact surface is each member such as the absorber. Of the front and back surfaces, the surface is directed to the side opposite to the wearer's skin when worn. Body fluid refers to fluid discharged from the body, such as urine, blood, and water in loose stool.

  Examples of the absorbent article 1 include, but are not limited to, tape-type disposable diapers, pants-type disposable diapers, urine-absorbing pads, light incontinence pads, and sanitary products, regardless of whether they are for infants or adults. Instead, other absorbent articles may be used.

  FIG. 1 is a developed view of an absorbent article having a top sheet according to the present embodiment as viewed from the top sheet side. 2 is a schematic cross-sectional view of the absorbent article taken along line AA in FIG. As shown in FIGS. 1 and 2, the absorbent article 1 includes a liquid-permeable top sheet 2 disposed on the skin contact surface side, and a liquid-impermeable back disposed to face the top sheet 2. The sheet | seat 3 and the absorber 4 arrange | positioned between the top sheet 2 and the back seat | sheet 3 are provided. Thereby, the absorber 4 has a structure sandwiched between the top sheet 2 and the back sheet 3.

  Further, in order to form a confinement space for bodily fluids and stool and prevent side leakage thereof, a solid gather sheet 7a and a solid gather elastic member arranged along the free end of the solid gather sheet 7a 7b may be formed. Furthermore, a liquid diffusive sheet 8 may be provided between the top sheet 2 and the absorber 4 in order to promote diffusion of body fluid to the upper surface of the absorber 4.

  Next, each component of the absorbent article 1 will be described in order.

(Top sheet)
FIG. 3 is a plan view of the top sheet in the region indicated by P in FIG. 2 as viewed from the skin contact surface side. FIG. 4 is a schematic cross-sectional view of the top sheet taken along line BB in FIG. As shown in FIGS. 3 and 4, the top sheet 2 includes a first top sheet 21 and a second top sheet 22 provided closer to the non-skin contact surface than the first top sheet 21. The 1 top sheet 21 is partially joined to the second top sheet 22 by a joint portion 23 having a predetermined pattern, and is composed of a shaped composite sheet shaped in a convex shape on the skin contact surface side in a sectional view. Yes. The joining portion 23 is preferably joined by heat.

  The shape of the joint portion 23 shown in FIG. 3 exemplifies a circular shape, but may be an elliptical shape, a triangular shape, a rectangular shape, a polygonal shape, or a combination thereof, and a line such as a straight line or a curved line. You may form in a shape. Among these, a circular shape is preferable from the viewpoint of a balance between workability and bondability. In addition to the rhombus shown in FIG. 3, the formation pattern of the joint 23 on the top sheet 2 may be an ellipse, a triangle, a rectangle, a polygon, or a combination thereof.

As shown in FIG. 4, the top sheet 2 is composed of a first top sheet 21 on the skin contact surface side and a second top sheet 22 on the non-skin contact surface side. It is preferable that the region (convex region 21c) shaped in a convex shape has a hollow structure. The shape of the convex region 21c is not particularly limited, and examples thereof include a cone shape, a cone shape, a rectangular parallelepiped shape, a quadrangular pyramid shape, a hemispherical shape, a triangular pyramid shape, a truncated cone shape, and a truncated pyramid shape. It is done. Bottom area 21a of the convex region have excellent beautification properties, it is preferably 20 mm ² or more 100 mm ² or less, more preferably 50 mm ² or more 100 mm ² or less. In addition, the convex region 21c has a hemispherical shape, a truncated cone shape, or a truncated berth in which the bottom area is larger than the upper area because the convex region 21c is not easily crushed when worn and has a good touch. A pyramid shape is preferred. Furthermore, the height 21h of the convex region is preferably 0.5 mm or greater and 3.0 mm or less. If the height 21h of the convex region is lower than 0.5 mm, the contact area with the skin is increased by being easily crushed during loading, and if it exceeds 3.0 mm, body fluid is absorbed through the second top sheet 22. The distance to reach the body 4 becomes longer, and the absorption speed decreases.

  The bottom area 21a of the convex region can be measured by, for example, photographing the top sheet 2 from above and performing image processing using Win ROOF (manufactured by Mitani Corporation), which is the image analysis software described above. Similarly, the height 21h of the convex region is image analysis software, similarly to the measurement of the bottom area, cut out using only a top sheet 2 or a razor or the like so as not to deform the absorbent article 1. It can be measured by performing image processing using Win ROOF (Mitani Corporation).

(thickness)
The shaped composite sheet constituting the top sheet 2 is compared with a laminated sheet obtained by laminating a raw first top sheet 21 and a raw second top sheet 22 under a load of 0.25 gf / cm ² , It has a thickness of 1.3 times to 2.0 times, and has a thickness of 1.5 times to 2.0 times under a load of 35 gf / cm ² . The thickness of the sheet under a load of 0.25 gf / cm ^{2 and a} load of 35 gf / cm ² can be measured, for example, by using a height gauge (manufactured by Mitutoyo Corporation). By setting the thickness of the shaped composite sheet and the ratio of the laminated sheet to the above ranges, an appropriate gap is generated in the top sheet 2 and is not easily crushed even under a load, and is excellent in flexibility and absorption performance.

(Air permeability)
The shaped composite sheet constituting the top sheet 2 has an air permeability of 3 cm ³ / cm ² / s or more and 6 cm ³ / cm ² / s or less, and the unprocessed first top sheet 21 and the unprocessed second Compared with the laminated sheet in which the top sheet 22 is laminated, the air permeability is 1.5 times or more and 2.0 times or less. By making the ratio of the air permeability of the shaped composite sheet and the air permeability of the laminated sheet within the above range, the top sheet 2 can reduce stuffiness even when worn for a long time. Further, the air permeability can be measured by the following method using a breathability tester (for example, FX3300, manufactured by Tex Test Co., Ltd.) as measured by the Frazier method defined in JIS L1913: 2010.

150 mm × 150 mm each sheet and a label sheet assuming the skin are bonded to each other by bonding the outer peripheral portion with a heat sealing machine under a condition of 35 gf / cm ² which is a load assuming wearing of the absorbent article 1 Take three specimens. After the first top sheet is on the upper side (intake side) and a test piece is attached to one end of the cylinder of the test machine, the suction fan and air hole are adjusted so that the inclination type barometer shows a pressure of 125 Pa by an adjusting resistor. Measure the pressure indicated by the vertical barometer at that time. In the measurement area 37.8Cm ^2, from the measured pressure and the type of air hole used to determine the amount of air passing through a test specimen from the translation table annexed to the tester ^{(cm 3 / cm 2 / s} ).

(Repeated absorption rate)
The shaped composite sheet constituting the top sheet 2 has a repetitive absorption rate of 3/3 or less compared to a laminated sheet obtained by laminating a raw first top sheet 21 and a raw second top sheet 22. With the total number of times. By setting the ratio of the total of three repetition absorption speeds of the shaped composite sheet and the laminated sheet within the above range, the body fluid remains in the top sheet 2 even when the body fluid is discharged several times due to long-time wearing. It penetrates into the absorber 4 smoothly without staying at the surface. The repeated absorption rate is measured as follows, for example.

First, a laminate in which one test piece of a top sheet 2 cut to 10 cm × 10 cm is placed on a laminate of five impregnated filter papers (No. 26, 160 mm in diameter, TSUMESTUKI manufactured by Advantech) as an absorbent article. Prepare. Next, a hole having an inner diameter of 19 mm is opened at the center of a cylinder having a bottom area of 16.8 cm ² , and a measuring jig having a mass of 755.6 g is placed on the center of the laminate, and physiological saline is placed from the upper hole. 20 ml of water is injected all at once, and the time is measured from the point in time when the physiological saline comes into contact with the laminate to the point where the liquid is completely sucked into the circumference in the center circle of the jig (first time). Then, 20 ml of physiological saline is injected again after the lapse of 3 minutes, and the time until absorption is similarly measured (second time). Further, after the lapse of 3 minutes, 20 ml of physiological saline is injected again and absorbed similarly. Measure the time to complete (third time).

(Liquid return amount)
The shaped composite sheet constituting the top sheet 2 has a liquid return amount of 1/3 or less compared to a laminated sheet obtained by laminating a raw first top sheet 21 and a raw second top sheet 22. . The top sheet 2 has a reduced contact area with the skin due to the shaping process, and the body fluid absorbed in the absorbent body 4 is compared with the unprocessed laminated sheet by setting the liquid return amount within the above range. The feeling of discomfort due to oozing out to the top sheet 2 side is eliminated, and the feeling of wearing is improved. The liquid return amount is measured, for example, as follows.

The top sheet 2 is cut into 10 cm × 10 cm to obtain a test piece. Next, the mass W1 of 10 measurement filter papers (No. 2 filter paper manufactured by ADVANTEC, diameter 55 mm) is measured with an electronic balance. 5 sheets of impregnating filter paper (Advantech NO.26 diameter 160mm TSUMESTUKI) are put into a vat, immersed in 200 ml of physiological saline for 1 minute or more, allowed to be saturated, and then held with nails in a vertical state. Suspend and drain for 1 minute. The drained impregnated filter paper is placed in a horizontal state and allowed to stand for 1 minute. Then, a single test strip placed on the impregnating filter paper, further, place the ten measurement filter paper on top of the test piece, so as to be 70 gf / cm ² thereon, the weight (bottom pressure 35 g / ^cm 2, Two pieces of mass 687 g) are put on top of each other. In this state, after standing for 30 seconds, the weight and the filter paper for measurement are removed, the test piece is taken out, and the mass W2 of the filter paper for measurement (for 10 sheets) is measured with an electronic balance, and the liquid return amount = W2-W1. calculate.

(Contact cold feeling)
The shaped composite sheet constituting the top sheet 2 has a contact cold / warm feeling evaluation value of 0.05 J / cm ² or less, and the contact cold / warm feeling evaluation value of the shaped composite sheet is unprocessed with the unprocessed first top sheet 21. It is smaller than the contact cold / warm feeling evaluation value of the laminated sheet obtained by laminating the processed second top sheet 22, and the difference is 0.04 J / cm ² or more. Here, the cold feeling of contact is to evaluate whether the skin feels cold or warm when touching an object by the difference in the amount of heat transferred from the human skin to the object. The heat absorption rate (q-max) is used. The smaller the numerical value of the contact cold / warm feeling evaluation value, the smaller the heat transfer when contacting. The contact cold / warm feeling evaluation value can be measured using, for example, a precise rapid thermophysical property measuring device KES-F7 (THERMO LABII TYPE) manufactured by Kato Tech. The top sheet 2 has a reduced contact area with the skin due to the shaping process, and by making the contact cool / warm evaluation value within the above range, a cooler foreign body sensation is obtained compared to the unprocessed laminated sheet. Less and has a light touch.

The top sheet 2 may be made of a base material having liquid permeability so that body fluid moves to the absorbent body. For example, an air-through nonwoven fabric, a point bond nonwoven fabric, a span made of synthetic fibers such as polypropylene, polyethylene, and polyester. Bonded nonwoven fabric, spunlace nonwoven fabric, nonwoven fabric such as thermal bond nonwoven fabric, composite nonwoven fabric laminated with thermal bond / spunbond, open film such as open polyethylene film, foamed film such as polyethylene foam, urethane foam, etc. It is formed from a material such as a composite sheet. Moreover, it is preferable that the basic weight of the 1st top sheet 21 and the 2nd top sheet 22 is 15 g / m < ² > or more respectively, and 20 g / m < ² > or more is more preferable. If the amount is less than 15 g / m ² , the amount of liquid return increases, which causes discomfort to the wearer. The first top sheet 21 and the second top sheet 22 may be the same base material or different base materials, but are preferably thermal bond nonwoven fabrics each having a basis weight of 15 g / m ² or more from the viewpoint of processability. Moreover, you may use the base material colored to the 2nd top sheet 22 from a cosmetic viewpoint. Furthermore, in order to reduce irritation to the skin, the top sheet 2 may contain a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizing agent and the like. Although there is no restriction | limiting in particular as a shape of the top sheet 2, What is necessary is just the shape which covers the absorber 4 in order to guide to the absorber 4 so that a body fluid may not leak.

(Back sheet)
The back sheet 3 may be formed of a material such as a nonwoven fabric, a resin film, or a composite sheet obtained by laminating these materials, as long as the base material has a liquid impermeability so that the body fluid retained by the absorbent body does not leak into the underwear. Is done. Such a nonwoven fabric is not particularly limited in its production method, and examples thereof include spunbond and meltblown nonwoven fabrics, or composite nonwoven fabrics in which spunbond / meltblown, spunbond / meltblown / spunbond are laminated, and composite materials thereof. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene.

From the viewpoint of strength and workability, the basis weight of the backsheet 3 is preferably 15 g / m ² or more. Moreover, in order to prevent the stuffiness at the time of mounting | wearing, it is preferable that the back sheet 3 has air permeability. In order to provide air permeability, for example, a filler is blended in the resin film of the base material, and embossing is applied to the back sheet 3. An example of the filler is calcium carbonate, and the processing method thereof can be a known method without limitation.

(Absorber)
It is preferable that the absorber 4 contains the absorptive fiber as a base material and the superabsorbent resin (SAP). The absorbent fiber is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, diapers and urine pads. For example, fluff pulp, cotton, rayon, acetate, tissue, absorbent paper, hydrophilic paper It is formed from a non-woven fabric. Among these, fluff pulp is preferable from the viewpoint of absorbability. Examples of such fluff pulp include wood pulp, synthetic fibers, polymer fibers, etc. and non-wood pulp defibrated into cotton. The absorbent fibers of the absorbent body 4 preferably have a basis weight of 100 g / m ² or more and 600 g / m ² or less so as not to impair the absorption performance and the touch.

The SAP of the absorbent body 4 is not particularly limited as long as it can absorb body fluid and prevent backflow. For example, sodium polyacrylate, polyaspartate, (starch-acrylic acid) graft Copolymers, (acrylic acid-vinyl alcohol) copolymers, (isobutylene-maleic anhydride) copolymers and saponified products thereof are used. Of these, sodium polyacrylate is preferable from the viewpoint of the amount of absorption per weight. The SAP amount of the absorbent body 4 is preferably set to a basis weight of 50 g / m ² or more and 600 g / m ² or less so as not to impair the absorption performance and the touch.

  The absorbent fibers and SAP of the absorbent body 4 are preferably formed by mixing SAP particles in the absorbent fibers, or an SAP sheet in which the SAP particles are fixed between the absorbent fibers. Moreover, in order to prevent leakage of SAP particles and stabilize the shape of the absorber 4, it is preferable to wrap the absorber 4 in a carrier sheet. As a base material of a carrier sheet, what is necessary is just to have hydrophilicity, and hydrophilic nonwoven fabrics, such as tissue, an absorbent paper, an airlaid nonwoven fabric, can be mention | raise | lifted. In the case where a plurality of carrier sheets are provided, the base material of the carrier sheet may be the same or different.

(Three-dimensional gather)
As the three-dimensional gather elastic member 7b, for example, a polyurethane thread, a strip-like polyurethane film, a thread-like or strip-like natural rubber or the like is used, and the three-dimensional gather sheet 7a is a water-repellent or non-repellent material formed of hydrophobic fibers. A liquid-permeable nonwoven fabric, for example, a spunbond nonwoven fabric, a melt blown nonwoven fabric, a composite nonwoven fabric in which spunbond / meltblown / spunbond is laminated, or the like is used. The three-dimensional gather 7 is such that the outer end in the short direction of the absorbent article 1 is fixed to the back sheet 3, the inner end is fixed to the top sheet 2, and the center is a free end that is not fixed to the top sheet 2. A three-dimensional gathering sheet 7a is arranged. By providing the elastic member 7b for three-dimensional gathers along a longitudinal direction, it has a standing property and is provided so that it can deform | transform according to a wearer's body shape.

(Liquid diffusion sheet)
The base material of the liquid diffusive sheet 8 may be any material as long as the body fluid permeation rate is faster than that of the top sheet 2 and quickly diffuses the body fluid into the absorbent body 4. For example, a hydrophilic nonwoven fabric, particularly an air-through nonwoven fabric is preferable. The thickness of the liquid diffusable sheet 8 is preferably 0.1 mm or more, and the basis weight thereof is preferably 15 g / m ² or more, and more preferably 18 g / m ² or more. When the thickness is less than 0.1 mm or the basis weight is less than 15 g / m ² , the liquid is not sufficiently diffused over the entire upper surface of the absorber 4. The shape of the liquid diffusive sheet 8 is not particularly limited, but is preferably a shape that can completely cover the surface of the absorbent body 4 so that body fluid diffuses throughout the absorbent body 4.

  The manufacturing method of the absorbent article 1 can employ a well-known method. For example, (A) a process of forming absorbent bodies 4 by forming absorbent mats by stacking absorbent fibers together with SAP; B) A step of fixing and integrating the top sheet 2 and the three-dimensional gather 7 with a hot melt adhesive, and (C) a step of applying a hot melt adhesive on the inside of the top sheet 2, the three-dimensional gather 7 and the back sheet 3. (D) In the collective drum, a step of disposing the top sheet 2 on the upper part of the absorbent body 4 and the back sheet 3 on the lower part of the absorbent body 4, and fixing and integrating the constituent members, (E) the absorbent article 1 The process which cuts the semi-finished product of this by the product dimension with a cutter apparatus, and cut | disconnects each absorbent article 1 is mention | raise | lifted.

  Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

<Example 1>
(Production of top sheet)
First, a thermal bond nonwoven fabric (nonwoven fabric A) having a basis weight of 20 g / m ² was prepared as a base material for the first top sheet and the second top sheet. A laminate sheet obtained by laminating the MD direction and the CD direction of the non-woven fabric A and laminating two sheets was used as a laminate sheet obtained by laminating the unprocessed first top sheet and the unprocessed second top sheet in Example 1. Next, a shaped composite sheet was produced in which two nonwoven fabrics A were first joined to the first top sheet and the second top sheet at the joint portion of the pattern shown in FIG.

<Example 2>
In Example 1, a laminated sheet and a shaped composite sheet were produced in the same manner as in Example 1 except that a thermal bond nonwoven fabric (nonwoven fabric B) having a basis weight of 22 g / m ² was used instead of the nonwoven fabric A. The sample of Example 2 was used.

<Comparative Examples 1-3>
In Example 1, in place of the nonwoven fabric A, a thermal bond nonwoven fabric having a basis weight of 25 g / ^{m 2} (nonwoven C), thermal bond nonwoven fabric (nonwoven D) a basis weight of 20 g / ^{m 2,} a basis weight of 30 g / ^{m 2} thermal bond A laminated sheet and a shaped composite sheet were produced in the same manner as in Example 1 except that each of the nonwoven fabrics (nonwoven fabric E) was used.

  The thicknesses of the laminated sheets and shaped composite sheets of Examples 1 and 2 and Comparative Examples 1 to 3, the contact cold / warm feeling evaluation value, the air permeability, the repeated absorption rate, and the liquid return amount are all 20 ° C. and 65% RH. Measurement was performed in a constant temperature and humidity chamber. Table 1 shows various test results and comprehensive evaluation based on these results.

(thickness)
The thickness of the laminated sheet and the shaped composite sheet was measured using a height gauge (HW-30 manufactured by Mitutoyo Corporation). The thickness under a load of 0.25 gf / cm ² is that an acrylic plate (30 mm × 45 mm × 2 mm) having a mass of 3.25 g is placed on the center of the sheet, and the thickness up to the upper surface of the acrylic plate is measured with a height gauge. Measurement was performed by subtracting the thickness of the plate. Further, a circular weight (diameter 50 mm) is further placed on the acrylic plate placed on the center of the sheet so that the thickness under a load of 35 gf / cm ² is 35 gf / cm ² (0.343 N / cm ² ). After placing and measuring the thickness up to the upper surface of the weight with a height gauge, the thickness of the acrylic plate and the weight was subtracted and measured.

(Air permeability)
The air permeability of the laminated sheet or shaped composite sheet was measured using a breathability tester (FX3300, manufactured by Tex Test Co., Ltd.) based on the Frazier method defined in JIS L1913: 2010. A test piece of 150 mm × 150 mm, in which each sheet and an air-impermeable sheet assuming the skin are bonded to each other by a heat sealer under a condition of 35 g / cm ^2, which is a load assuming wearing of an absorbent article. Three samples are taken, the first top sheet is the upper side (intake side), and a test piece is attached to one end of the cylinder of the test machine, and then the suction fan and The air hole was adjusted, and the pressure indicated by the vertical barometer at that time was measured. In the measurement area 37.8cm ^2, amount of air passing through the test piece ^{(cm 3 / cm 2 / s} ) measured at N = 3, and the average value was defined as the air permeability.

(Repeated absorption rate)
The repeated absorption rate of the laminated sheet or shaped composite sheet was measured by the following method. First, a laminate in which one test piece of a sheet cut to 10 cm × 10 cm is arranged on five sheets of impregnated filter paper (No. 26, 160 mm in diameter, TSUMESTUKI manufactured by Advantech), prepared as an absorbent article, is prepared. did. Next, a hole having an inner diameter of 19 mm is opened at the center of a cylinder having a bottom area of 16.8 cm ² , and a measuring jig having a mass of 755.6 g is placed on the center of the laminate, and physiological saline is placed from the upper hole. 20 ml of water was poured all at once, and the time was measured from the time when the physiological saline was brought into contact with the laminate to the point where the liquid was completely sucked into the circumference in the center circle of the jig (first time). Then, 20 ml of physiological saline is injected again after the lapse of 3 minutes, and the time until absorption is similarly measured (second time). Further, after the lapse of 3 minutes, 20 ml of physiological saline is injected again and absorbed similarly. The time until this was measured (third time). In addition, the measurement of each absorption rate of the above-mentioned 1st time-3rd time was made into the average value of all having been performed about the sample of N = 2 or more. In addition, the total value of the first to third absorption rates was also calculated.

(Liquid return amount)
The liquid return amount of the laminated sheet or shaped composite sheet was measured by the following method. First, a sheet was cut into 10 cm × 10 cm to obtain a test piece. Next, the mass W1 of 10 measurement filter papers (No. 2 filter paper manufactured by ADVANTEC, diameter 55 mm) was measured with an electronic balance. 5 sheets of impregnating filter paper (Advantech NO.26 diameter 160mm TSUMESTUKI) are put into a vat, immersed in 200 ml of physiological saline for 1 minute or more, allowed to be saturated, and then held with nails in a vertical state. Hanging and drained for 1 minute. The drained impregnated filter paper was placed in a horizontal state and allowed to stand for 1 minute. Then, a single test strip placed on the impregnating filter paper, further, place the ten measurement filter paper on top of the test piece, so as to be 70 gf / cm ² thereon, the weight (bottom pressure 35 g / ^cm 2, Two pieces of mass 687 g) were placed on top of each other. In this state, after standing for 30 seconds, the weight and the filter paper for measurement are removed, the test piece is taken out, and the mass W2 of the filter paper for measurement (for 10 sheets) is measured with an electronic balance, and the liquid return amount = W2-W1. Calculated. The measurement was performed 5 times by the above method, and the average value was defined as the liquid return amount.

(Contact cold / warm feeling evaluation value)
The contact cold / warm feeling evaluation value of a laminated sheet or a shaped composite sheet is measured by measuring the maximum heat transfer amount (q-max value) using a precise rapid thermophysical property measuring device KES-F7 (THERMO LABOII TYPE) manufactured by Kato Tech. did. First, the temperature of BT-BOX of the sensor was set to 30 ° C., and the temperature of the Water Box was set to 20 ° C. The top sheet was cut to 6.5 cm × 6.5 cm and placed on a Water Box. The T-BOX set at 30 ° C. was quickly moved onto the top sheet on the Water Box, and the maximum heat transfer amount (q-max value) was read.

(Comprehensive evaluation)
Based on various test results, the absorbent article was evaluated comprehensively. As an absorbent article, an excellent article is indicated by “◎”, an excellent article is indicated by “◯”, an ordinary article is indicated by “△”, and an inferior article is indicated by “X”. The results are shown in Table 1.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. Further, it is apparent from the scope of the claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Absorbent article 2 Top sheet 21 First top sheet 21c Convex area 21a Bottom area 21h of convex area 22 Height of convex area 22 Second top sheet 23 Joint part 3 Back sheet 4 Absorber 7 Solid gather 7a Solid gather Sheet 7b elastic member 8 for three-dimensional gathers Liquid diffusive sheet

Claims (3)

A top sheet of an absorbent article,
A first topsheet;
A second top sheet provided closer to the non-skin contact surface than the first top sheet,
The first top sheet is shaped in a convex shape on the skin contact surface side in a cross-sectional view, and is a shaped composite sheet that is partially joined to the second top sheet at a joint of a predetermined pattern,
As a ratio of the shaped composite sheet to a laminated sheet obtained by laminating the raw first top sheet and the raw second top sheet,
Under load of 0.25 gf / cm ^2, the thickness of 1.3 times or more and 2.0 times or less, under load of 35 gf / cm ² , the thickness of 1.5 times or more and 2.0 times or less, 1.5 times More than 2.0 times the air permeability, 2 times the total absorption of 3 times or less, and 1/3 or less liquid return amount,
The shaped composite sheet has an air permeability of 3 cm ³ / cm ² / s or more and 6 cm ³ / cm ² / s or less, and a contact cold / warm evaluation value of 0.05 J / cm ² or less,
The top sheet characterized in that the contact cold / warm feeling evaluation value of the shaped composite sheet is smaller than the contact cold / warm feeling evaluation value of the laminated sheet, and the difference is 0.04 J / cm ² or more. The top sheet according to claim 1, wherein the first top sheet and the second top sheet are thermal bond nonwoven fabrics having a basis weight of 15 g / m ² or more. An absorbent article,
The liquid-permeable top sheet according to claim 1 or 2,
A liquid-impermeable backsheet;
An absorbent article comprising: an absorbent body disposed between the top sheet and the back sheet.

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