JP2010136899A - Absorbent body for absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent body which excellently absorbs a liquid, is comparatively flexible, and hardly gives a strange feeling, etc., to a wearer, and also to provide an absorbent body manufacturing method. <P>SOLUTION: The absorbent body 14 is the vertically long absorbent body for an absorbent article 1, where a plurality of high-density parts 15 and a plurality of low-density parts 16 are respectively extended in the longitudinal direction of the absorbent body 14. The high-density parts 15 and the low-density parts 16 are alternately formed in the width direction of the absorbent body 14. The absorbent body manufacturing method includes: a process for depositing by suction fiber materials supplied on an air stream onto accumulation recessions having grooves in the bottom surfaces, and obtaining a deposited body having a projected line corresponding to each groove; and a process for pressurizing the obtained deposited body and crushing the projected line. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to absorbent articles such as sanitary napkins, panty liners (orimono sheets), incontinence pads, absorbent bodies for absorbent articles, and methods for producing the same.

In an absorbent article such as a sanitary napkin, in order to promote the liquid transfer from the top sheet to the absorber and the liquid transfer from the top layer to the bottom layer of the top sheet having a two-layer structure, the top sheet and the absorber It is known to provide a density gradient between the upper layer and the lower layer between the upper layer and the lower layer.
However, when a density gradient is provided between the upper layer and the lower layer of the surface sheet, in order to ensure the transferability of the liquid from the lower layer of the surface sheet to the absorber, the density between the lower layer of the surface sheet and the absorber is increased. When the gradient is provided, the absorbent body becomes dense and hard, and the degree of freedom of deformation is reduced, resulting in inconveniences such as giving the wearer an uncomfortable feeling.

  In addition, as a technique related to the absorbent body, Patent Document 1 discloses an absorbent body in which a hydrophobic material and a hydrophilic material are arranged so that the absorbent body is alternately arranged in the width direction in a cross section near the center. The article is listed. Patent Document 2 discloses the bending resistance of the central region in the lateral direction of a laminate having a liquid-permeable top sheet, a back sheet, and an absorbent core provided between the two sheets. Absorbent articles have been proposed that are higher in area than the area where the absorbent core is present.

JP-A-1-285266 JP 2000-225138 A

Since the absorbent in the absorbent article of Patent Document 1 uses the liquid absorption inhibition of the hydrophobic material to diffuse the liquid in the longitudinal direction, the drawability of the liquid from the top sheet to the absorbent is This is thought to be worse than when no hydrophobic material is disposed in the absorber.
Although the absorbent article of patent document 2 improves the fitting property at the time of wearing, the high-density part is not arranged in stripes, and the effect of improving the drawability of the liquid from the topsheet to the absorber is I can hardly expect it.

Accordingly, it is an object of the present invention to provide an absorbent body that is excellent in liquid drawability, is relatively flexible, and does not easily give the wearer an uncomfortable feeling, and a method for manufacturing the same.
Another object of the present invention is to provide an absorbent article that has excellent liquid drawability, is relatively flexible, and does not easily give the wearer a sense of incongruity.

The present invention is a vertically long absorbent body for an absorbent article, wherein a plurality of high density portions and a plurality of low density portions are respectively formed extending in the longitudinal direction of the absorbent body. The density part and the low density part achieve the above-mentioned object by providing an absorbent body that is alternately formed in the width direction of the absorbent body.
In the present invention, the absorbent body is disposed between the skin contact surface and the non-skin contact surface, and the high-density portion and the low-density portion of the absorbent body are excreted from the absorbent article. The absorbent article currently formed in the part opposing part is provided.

  The present invention also relates to a method for manufacturing an absorbent body preferably used for manufacturing the above-described absorbent body, in which a fiber material supplied in an air stream is sucked and deposited in a concave portion for accumulation having a groove portion on a bottom surface portion. And providing a method for producing an absorbent body comprising a step of obtaining a deposit having a protruding portion corresponding to the groove, a step of pressing the obtained deposit, and crushing the protruding portion.

ADVANTAGE OF THE INVENTION According to the absorber of this invention, and its manufacturing method, while being excellent in the drawability of a liquid, the absorber which is comparatively flexible and cannot give a wearer a discomfort etc. can be provided.
According to the absorbent article of the present invention, it is possible to provide an absorbent article that has excellent liquid drawability and is relatively flexible and hardly gives the wearer a sense of incongruity.

Hereinafter, the present invention will be described based on a preferred embodiment thereof with reference to the drawings.
A sanitary napkin 1 (hereinafter also simply referred to as a napkin 1), which is an embodiment of the absorbent article of the present invention, includes a top sheet 12, a back sheet 13, and an absorbent body 14 positioned between the two sheets 12, 13. ing. The absorber 14 is an embodiment of the absorber of the present invention.
The top sheet 12 forms a skin contact surface P that is in contact with the skin of the wearer when worn on the napkin 1, and the back sheet 3 is a surface opposite to the skin contact surface P in the napkin 1. The non-skin contact surface Q is formed. The non-skin contact surface Q in the napkin 1 is directed to the clothing side such as a crotch portion of shorts when worn.
The napkin 1 has a vertically long shape, and the front sheet 12 and the back sheet 13 extending from the front and rear ends of the absorber 14 are joined to form an end seal portion 17 at the front and rear portions in the longitudinal direction. Yes. Further, on both side portions in the longitudinal direction, both side portions 12 a and 12 a of the top sheet 12 are wound down to the non-skin contact surface side of the absorber 14 and are fixed between the absorber 14 and the back sheet 13. ing.
On the non-skin contact surface Q side of the napkin 1, there is provided an adhesive portion 18 for fixing the napkin 1 to a crotch portion of underwear such as shorts.

  As the top sheet 12 and the back sheet 13, those conventionally used for this type of article can be used without particular limitation. For example, as the top sheet 12, various water-permeable nonwoven fabrics, perforated films formed with a large number of apertures in a resin film, and the like can be used. As the back sheet 13, a resin film, a resin film and a nonwoven fabric, A laminate of the above can be used. Since the absorbent body in the present invention is excellent in liquid uptake, it is composed of two upper and lower fiber layers, and the lower fiber layer includes contracted heat-shrinkable fibers (latently crimpable fibers and the like). Even in combination with the sheet, good liquid suction from the top sheet to the absorber can be obtained.

The absorbent body 14 is made of an absorbent core made of a fiber material such as pulp fiber, or an absorbent core made by holding a water-absorbing polymer between fibers of the absorbent core, and a core wrap sheet made of tissue paper or a water-permeable nonwoven fabric. (Not shown).
As the fiber material constituting the absorbent core, various materials conventionally used for absorbent articles of absorbent articles such as sanitary napkins, panty liners, disposable diapers can be used without particular limitation. For example, pulp Short fibers of cellulosic fibers such as fibers, rayon fibers, and cotton fibers, and short fibers of synthetic fibers such as polyethylene are used. These fibers can be used alone or in combination of two or more. Moreover, it is preferable that the fiber material is entirely or partly pulp fiber, and the ratio of the pulp fiber in the fiber material is preferably 50 to 100% by mass, more preferably 80 to 100% by mass, More preferably, it is 100 mass%. In addition to a fiber material, you may mix | blend a deodorizer, an antibacterial agent, etc. with an absorptive core as needed. Moreover, you may mix | blend a water absorbing polymer.

As shown in FIGS. 1 and 2, the absorbent body 14 in the napkin 1 is composed of four high-density portions 15 in the shape of a band in a plan view in which the constituent fibers exist in a dense state, and the constituent fibers compared to the high-density portions 15. Has five low density portions 16 in a plan view band shape in a rough state. The plurality of high density portions 15 and the plurality of low density portions 16 are formed so as to extend in the longitudinal direction (X direction in the drawing) of the absorber 14, respectively. Are alternately formed in the width direction of the absorber 14 (Y direction in the figure). Further, the low density part 16 can be classified into a high density part low density part 16 a located between the high density parts 15 and a side low density part 16 b forming both side parts of the absorber 14.
The high density portion 15 is a portion where the density of the fiber material is high compared to the low density portion 16, and the low density portion 16 is a portion where the density of the fiber material is low compared to the high density portion 15.

The thickness of the absorber 14 in the napkin 1 is substantially the same in the high density portion 15 and the low density portion 16.
That the thickness of the absorber 14 is substantially the same in the high density portion 15 and the low density portion 16 is the ratio between the thickness T5 of the high density portion 15 and the thickness T6 of the low density portion 16 measured as follows ( T5 / T6) is approximately 1.0. Since the ratio (T5 / T6) of the thickness T5 of the high density portion 15 and the thickness T6 of the low density portion 16 is close to 1.0, it does not form a convex structure protruding toward the wearer side of the absorber. , It is preferable from the point which does not give a wearer the uncomfortable feeling by napkin wearing, for example, it is preferable that it is 1.0-1.2, More preferably, it is 1.0-1.1.

[Method for measuring thickness of high-density part and low-density part]
The thicknesses of the high-density part 15 and the low-density part 16 were measured by using a constant-pressure thickness meter after cutting each part from the absorber 14 into a size of 50 mm in length and 5 mm in width. The pressure at that time was 0.5 g / cm ² .

The napkin 1 has a longitudinal direction in which the front part 1A is arranged closer to the wearer's belly when worn, the liquid excretion part facing part 1B arranged to face the wearer's liquid excretion part, and the wearer's back when worn. It is preferable that the liquid excretion part facing part 1B has the plurality of high-density parts 15 and the plurality of low-density parts 16 described above when divided into the rear part 1C arranged close to the rear part 1C. In order to form the density portion, a predetermined length or more is necessary. Therefore, in the napkin 1 of the present embodiment, the plurality of high-density portions 15 and the plurality of low-density portions 16 described above include the napkin 1. It is formed from the front part 1A to the rear part 1C.
The length of the high-density portion 15 and the length of the low-density portion 16 parallel to the high-density portion 15 are preferably 30% or more of the total length of the absorber 14, and more preferably 50 to 100%.

If the width W1 of the high density portion 15 is too small, sufficient capillary force does not act on the absorber 14, and there is a possibility that the liquid will be sufficiently drawn from the topsheet to the absorber. Further, if the width W1 of the high-density portion 15 is too large and the width Wa of the low-density portion 16a between the high-density portions is too small, compression deformation in the width direction of the absorbent body 14 is hindered. There is a risk of discomfort.
From the above viewpoint, the width W1 of the high-density part 15 is preferably 3 to 30%, particularly 5 to 20% of the width W of the absorbent core 4, and the width Wa of the low-density part 16a between the high-density parts is The width W of the absorber 14 is preferably 3 to 30%, and particularly preferably 5 to 20%. The width Wb of the side low density portion 16b is 5 to 30% of the width W of the absorber 14, particularly 10 to 10%. It is preferably 25%.

  Further, the number of high-density portions 15 formed within the width of the absorbent body 14 is preferably 2 or more, more preferably 3 or more, and more preferably so that the capillary force acting on the absorbent body 14 works as uniformly as possible. Preferably it is four or more.

In the napkin 1 of the present embodiment, a plurality of high density portions 15 and a plurality of low density portions 16 are formed in the absorber 14 in the manner described above.
Since the absorbent body 14 has the low density portion 16, the liquid excreted on the napkin 1 quickly permeates and transfers to the low density portion 16 as shown in FIG. 3. The liquid is diffused into the high-density portion 15 by a coarse / dense gradient and is stably held in the high-density portion 15. As the high density portion 15 and the low density portion 16 play different roles in this way, the napkin 1 of the present embodiment prevents the liquid from being taken into the absorbent body from the top sheet and the liquid returning to the top sheet. Excellent performance (prevention of liquid return).

From the viewpoint of reliably obtaining such an effect, the density of the high density portion 15 (density of the fiber material) is preferably 0.03 to 0.30, particularly preferably 0.05 to 0.20, and the low density portion The density of 16 (the density of the fiber material) is preferably 0.01 to 0.20, particularly preferably 0.03 to 0.10.
The ratio (the former / the latter) of the density of the high density portion 15 (density of the fiber material) and the density of the low density portion 16 (density of the fiber material) is 1.2 to 4.0, particularly 1.5 to 3. 0 is preferred.

Along with the fiber material, one or more deodorants, antibacterial agents and water-absorbing polymers, in particular all of these, were fed in a stream of air and the mixture was sucked and deposited in the collecting recess In the case of the manufacturing method in which the deposited body is pressed to form the high density portion 15 and the low density portion 16, the density of all materials in the high density portion 15 is 0.05 to 0.40, particularly 0.10 to 0.00. 30 is preferable, and the density of all materials of the low density portion 16 is preferably 0.02 to 0.20, and particularly preferably 0.05 to 0.15.
The ratio (the former / the latter) of the density of all materials in the high density portion 15 and the density of all materials in the low density portion 16 is preferably 1.2 to 4.0, particularly preferably 1.5 to 3.0. .

[Method for measuring the density of all materials in the high density part and the low density part]
Samples were prepared by cutting each part from the absorber 14 into a length of 50 mm and a width of 5 mm, and measuring the weight of the sample using an electronic balance (A & D Electronic Balance GR-300, accuracy: 4 digits after the decimal point). did. The thickness of the sample was measured using a constant-pressure thickness meter, and the density of all materials in each part was calculated by dividing the measured sample weight by the volume of the sample (thickness × length × width). The measurement pressure of the low-pressure thickness gauge was 0.5 g / cm ² .
[Measurement method of density of high density part and low density part (density of fiber material)]
The weight of the fiber material contained in the sample prepared in the same manner as described above was obtained, and the density (fiber material) of each part was obtained in the same manner as above except that the weight of the obtained fiber material was divided by the volume of the sample. Density) was calculated.

  Moreover, since the high density part 15 and the low density part 16 are along the longitudinal direction of the napkin 1, the liquid diffuses in the width direction of the napkin 1 between the top sheet 2 and the absorbent body 14 or in the absorbent body 14. Therefore, the napkin 1 of the present embodiment is also excellent in preventing side leakage.

  Furthermore, when pressure is applied from the width direction of the napkin 1, the low-density portion 16 existing between the high-density portions 15 is flexibly deformed, so that it follows the movement of the wearer despite having the high-density portion 15. Therefore, it is possible to prevent the high-density portion 15 from giving a wearer an uncomfortable feeling or an uncomfortable feeling.

Next, the preferable manufacturing method of the sanitary napkin 1 mentioned above is demonstrated with reference to FIGS.
FIG. 4 is a diagram showing an absorbent body manufacturing apparatus 10 that is preferably used for manufacturing the absorbent body 14 of the sanitary napkin 1. As shown in FIG. 4, the manufacturing apparatus 10 includes a rotating drum 2 in which a plurality of accumulation recesses 21 (deposition portions) are formed at predetermined intervals on the outer peripheral surface, and a fiber material toward the outer peripheral surface of the rotating drum 2. Duct 3 for supplying 42 in a scattered state, fiber material supply unit 4 for supplying fiber material 42 to duct 3, and scuffing roll 5 for scraping off an excessive amount of fiber material deposited so as to overflow the recesses 21 for accumulation. And a covering mechanism (not shown) for covering the upper and lower surfaces of the deposit (absorbent core) 14A released from the accumulation recess 21 with the core wrap sheet 14B, and the absorbent core 14A with the cover sheet 14B. The resulting absorbent continuum is compressed between a pair of press rolls 61 and 62 and compressed, and the compressed absorbent continuum is cut into dimensions used for individual sanitary napkins. Absorber 14 And a cross-sectional device (not shown).

  The rotating drum 2 has a cylindrical shape and is driven to rotate at a constant speed in the direction of arrow A in FIG. On the outer peripheral surface of the rotating drum 2, a plurality of accumulation recesses 21, 21. An intake fan (not shown) is connected to the non-rotating portion inside the rotating drum 2 (rotating shaft side), and the partitioned spaces B and C inside the rotating drum are negatively driven by the intake fan. Maintained at pressure. The bottom surface portion of each collecting recess 21 is constituted by a mesh plate 21a and has a large number of pores. While the individual accumulation recesses 21 pass through the spaces B and C maintained at negative pressure, the pores at the bottom of each accumulation recess 21 function as suction holes. As shown in FIG. 5, a plurality of groove portions 23 are formed on the bottom surface portion 22 of the accumulation recess 21 so as to extend in the circumferential direction of the rotary drum 2.

  The duct 3 has one end 31 that covers a part of the outer peripheral surface of the rotating drum 2 and the other end 32 connected to the fiber material supply device 4, and the accumulation recess 21 located on the space B. The air flow that flows toward the outer peripheral surface of the rotary drum 2 is generated in the duct 3 by suction from the bottom surface portion. The fiber material supply unit 4 includes a defibrating machine 41. A sheet-like raw material 43 such as a pulp sheet is introduced into the defibrating machine 41 by nip rollers 44 and 44 for supplying the raw material, and the defibrated fiber material 42 is supplied. It is configured to be supplied into the duct 3.

The scuffing roll 5 has a brush around it, and scrapes off the fiber material 42 overflowing from the accumulation recess 21 with the brush. The deposit (absorbent core) 14 </ b> A that is not scraped off by the scuffing roll 5 and remains in the accumulation recess 21 is released from the accumulation recess 21 below the rotary drum 2. The mold release from the accumulation concave portion 21 maintains the partitioned space D in the rotary drum 2 at a positive pressure by a pressurizing means (not shown), and blows out air from the pores in the bottom surface portion of the accumulation concave portion 21. , By suction from the vacuum conveyor 7 side.
The covering mechanism includes a well-known transport mechanism for supplying the core wrap sheet 14B on the vacuum conveyor 7, and a deposit (absorbent core) 14A placed on the core wrap sheet, and then both sides of the core wrap sheet. The part is folded on the deposit (absorbent core) 14A, and the upper and lower surfaces of the deposit (absorbent core) 14A are covered with the core wrap sheet 14B by the folding.

A method of manufacturing the above-described absorber 14 will be described using the absorber manufacturing apparatus 10 shown in FIG.
First, the rotating drum 2 and the scuffing roll 5 are rotated, and the intake fan and the pressurizing unit are operated to make the spaces B and C negative and the space D positive. Moreover, the vacuum conveyor 7, the compression apparatus 6, and the said cutting device are operated.
By the operation of the intake fan, a suction force is generated on the bottom surface portion of the accumulation recess 21 located on the space B, and an air flow that flows toward the outer peripheral surface of the rotary drum 2 is generated in the duct 3.
Then, when the fiber material supply device 4 is operated to supply the fiber material 42 into the duct 3, the fiber material 42 is in a scattered state and is placed on the air flow flowing in the duct 3, so that the rotating drum 2 Supplied toward the outer peripheral surface.

  While the individual accumulation recesses 21 pass through the space B maintained at a negative pressure, the fiber material 42 supplied from the duct 3 is sucked and accumulated in each accumulation recess 21. A slightly excessive amount of fiber material is deposited on each accumulation recess 21, and the fiber material overflowing from the accumulation recess 21 is scraped off by the scuffing roll 5. The deposit (absorbent core) 14 </ b> A that is not scraped off by the scuffing roll 5 and remains in the accumulation recess 21 is released onto the core wrap sheet 14 </ b> B supplied onto the vacuum conveyor 7. FIG. 6A is a diagram showing a deposit (absorbent core) 14A released from the core wrap sheet 14B, and the deposit (absorbent core) 14A includes 4 in the accumulation recess 21. FIG. Four ridges 15 </ b> A corresponding to the groove portions 23 are formed.

The deposited body (absorbent core) 14A on the core wrap sheet 14B is also introduced into the compression device 6 after the surfaces having the ridges 15A are covered by both sides of the folded core wrap sheet 14B, and a pair of presses Pressure is applied between the rolls 61 and 62. As a result, the ridge 15A is crushed. The absorbent body continuum after the ridges 15A are crushed is cut by a cutting means (not shown) to become an absorbent body 14 having a size used for each sanitary napkin. In the obtained absorbent body 14, as shown in FIG. 6 (b), the portion where the ridges 15 </ b> A are crushed becomes the high density portion 15, and the other portions become the low density portion 16. .
The sanitary napkin 1 disposes the absorbent body 14 thus obtained intermittently between the strip-shaped original fabric of the top sheet 12 and the strip-shaped raw fabric of the back sheet 13, and then around the absorbent body 14. It is obtained by joining the front and back sheets and then cutting to the size of the individual sanitary napkin.

As mentioned above, although 1 embodiment of the absorber of this invention, its manufacturing method, and an absorbent article was described, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, the high density part and the low density part may be formed only in a part in the longitudinal direction of the absorber. For example, it may be formed only in the liquid excretion part facing part 1B of the absorber, may be formed only in the front part 1A and the liquid excretion part facing part 1B, and only the rear part 1C and the liquid excretion part facing part 1B. It may be formed.

In addition to fiber materials, absorbents containing one or more deodorants, antibacterial agents, and water-absorbing polymers, for example, absorbent materials containing fiber materials and water-absorbing polymers, fiber materials, deodorants, and antibacterial agents In addition, as described above, the method for producing the absorbent body including all of the water-absorbing polymer is obtained by mixing the fiber material with one or more of the deodorant, the antibacterial agent, and the water-absorbing polymer, There is a method of crushing, but as another method, only the fiber material is supplied in an air flow, and the fiber material is sucked and deposited to obtain a deposit having a protruding portion, and then the deposit is erased. There is also a method in which one or more odorants, antibacterial agents, and water-absorbing polymers are sprayed, and the step of crushing the ridges is applied to the volume after spraying. As the deodorant, the antibacterial agent and the water-absorbing polymer, various types conventionally used for absorbent articles can be used without any particular limitation.
Moreover, in the napkin 1 mentioned above, although both the side parts 12a and 12a of the surface sheet 2 were being fixed between the absorber 14 and the back surface sheet 3, as shown in FIG. The side seal portions 19 and 19 may be formed by joining the top sheet 12 and the back sheet 13 that extend from the side.
In addition to the sanitary napkin, the absorbent article of the present invention may be other absorbent articles such as panty liners (origami sheets), incontinence pads, and disposable diapers.
The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

EXAMPLES Hereinafter, although this invention is further demonstrated using an Example, this invention is not restrict | limited at all by this Example.
[Example 1]
An absorber having the configuration shown in FIGS. 1 and 2 was prepared. In the absorber, four high-density portions and five low-density portions are formed to extend in one direction, and the high-density portions and the low-density portions are alternately arranged in a direction perpendicular to the one direction. Was formed. The basis weight (weight) of the high-density part was 380 g / m ² , and the basis weight (weight) of the low-density part was 140 g / m ² . The width of the high density portion and the width of the low density portion were both 7.5 mm.
Remove the absorber from the Kao Corporation's commercially available sanitary napkin (trade name “Lorrieev many day to ordinary day”), place the above-mentioned absorber at the position of the removed absorber, restore the other, A sanitary napkin for evaluation was obtained. The commercially available sanitary napkin is composed of a nonwoven fabric having the following configuration.
Non-woven fabric: a laminated non-woven fabric having a two-layer structure having upper and lower fiber layers, the upper layer is made of 100% core-sheath type composite fiber having polyethylene terephthalate as a core and polyethylene as a sheath, and the lower layer is a latent spiral crimpable fiber (Yamato NBF-L (V) fiber manufactured by Boeing Co., Ltd., which is a core-sheath type composite fiber having a core made of polyethylene, a sheath made of polypropylene, and a helical crimp formed by heating. The weight ratio of the upper and lower layers (upper layer / lower layer) is 50/50. The upper and lower layers are joined by dot-like embossed portions arranged in a dotted pattern, and the underlying latent crimpable fibers are in a state of being contracted by heating.
The absorbent body of the example is obtained by mixing and stacking the fiber material and the water-absorbing polymer to obtain a deposit with a ridge, covering the deposit with a core wrap sheet, and then crushing the ridge. It is a thing.

[Example 2]
An absorbent body having the same configuration as in Example 1 was prepared except that the basis weight (weight per unit area) of the high density part was changed to 320 g / m ² and the basis weight (weight per unit area) of the low density part was changed to 160 g / m ² . A sanitary napkin for evaluation was obtained in the same manner as in Example 1 except that the absorbent was used.
Example 3
An absorbent body having the same configuration as in Example 1 was prepared except that the basis weight (weight per unit area) of the high density part was changed to 260 g / m ² and the basis weight (weight per unit area) of the low density part was changed to 160 g / m ² . A sanitary napkin for evaluation was obtained in the same manner as in Example 1 except that the absorbent was used.

[Comparative Example]
The above-mentioned commercially available sanitary napkin of Kao Corporation was used as a sanitary napkin for a comparative example. In this commercially available sanitary napkin absorbent body, circular embossed portions having a diameter of 2 mm were formed in a zigzag pattern over the entire area. The pitch between the center points of the embossed part is 7 mm. The basis weight (basis weight) was 250 g / m ² .

[Evaluation]
[Surface liquid remaining amount]
A sanitary napkin is placed horizontally, a cylindrical acrylic plate with a 1 cm diameter injection port is placed on the bottom, and 3 g of defibrinated horse blood (manufactured by Nippon Biotest Co., Ltd.) is injected from the injection port. Hold that state for a minute. Next, the acrylic plate with a cylinder was removed, and 16 sheets of absorbent paper (commercially available tissue paper) having a length of 6 cm × width of 9.5 cm and a basis weight of 13 g / m ² were placed on the surface of the top sheet. Further, a weight was placed thereon so that the pressure was 4.0 × 10 ² Pa, and pressure was applied for 5 seconds. After pressurization, the absorbent paper was taken out, the weight of the paper before and after pressurization was measured, and the weight of defibrinated horse blood absorbed by the paper was measured to determine the remaining amount of surface liquid.
Next, the above acrylic plate was overlaid again on the sample after the test, and 3 g of defibrinated horse blood was again injected through the injection port 3 minutes after the first injection. The position of horse blood injection into the sanitary napkin was the same as the position where the first 3 g was injected. And after the injection | pouring, after maintaining the state for 1 minute, the acrylic board was removed, the absorption paper similar to the above was piled up, and the surface liquid residual amount was measured similarly. Further, 3 minutes after the second injection, 3 g of defibrinated horse blood was similarly added to the sample after the measurement, and the remaining amount of the surface liquid was measured in the same manner.
Table 1 summarizes the measurement results of the remaining amount of the surface liquid when the total injection amount of horse blood is 3 g, 6 g, and 9 g.

[Liquid diffusion range]
The absorbent body was taken out from the sample after measuring the remaining amount of the surface liquid with the amount of defibrinated horse blood injected as 9 g, and the size of the range in which the horse blood diffused in each absorber was measured.
For the samples of Examples 1 to 3, in the horse blood diffusion range, the maximum length La in the direction in which the high density portion and the low density portion extend and the maximum in the direction orthogonal to the direction in which the high density portion and the low density portion extend. The length Lb was measured. For the comparative example, the maximum length in the direction in which the equine blood spreads more widely in the longitudinal direction and the width direction of the napkin is La, and the maximum length in the direction orthogonal to the direction is Lb.
Table 1 shows the results and the ratio (La / Lb). In Table 1, the direction in which the high density portion and the low density portion extend is described as the longitudinal direction, and the direction in which the high density portion and the low density portion extend is described as the width direction.

From the results shown in Table 1, each of Examples 1 to 3 has less surface liquid remaining after 9 g total injection (after repeating 3 g injection three times) and excellent liquid drawability compared to the comparative example. It was suggested. In particular, Examples 1 and 2 have menstrual blood because the remaining amount of the surface liquid is lower than that of the comparative example after injection 1 to 3 times, the liquid retainability is excellent, and the liquid is difficult to return to the wearer's skin side. It can be seen that the stickiness of the surface after excretion is suppressed and a more comfortable wearing feeling is provided to the wearer.
Further, when the diffusion state of the liquid after 9 g total injection (after 3 g injection was repeated three times) was observed, each of Examples 1 to 3 was orthogonal to the direction in which the high density portion and the low density portion extend compared to the comparative example. It was found that the maximum length Lb in the extending direction is small and the maximum length La in the direction in which the high density portion and the low density portion extend is large. Thereby, it turns out that Comparative Examples 1-3 suppresses the spreading | diffusion of the liquid to a product width direction, and the effect which suppresses the leakage of menstrual blood from a product width direction is high.
It can be seen that the effect of reducing the remaining amount of the surface liquid and the effect of suppressing the liquid diffusion in the product width direction are more prominent when the member density of the high density portion is higher and the member density of the low density portion is lower. .

[Flexibility]
The sanitary napkins of Example 1 and Comparative Example were fixed to shorts and attached to a female human body model. When a pressure sensor ("pressure sensor element" made by PPS (Pressure Profile System)) is inserted into the buttocks of the human body model and the foot of the female human body model is bent inward, within a pressure detection range of 25mm x 25mm The maximum detected pressure was determined.
As a result, the maximum pressure applied to the model collar of the sanitary napkin of Example 1 was 7.0 kPa, and the maximum pressure applied to the model collar of the sanitary napkin of Comparative Example was 8.4 kPa.
From this result, compared with the sanitary napkin of the comparative example, the sanitary napkin of Example 1 has a lower pressure applied to the wearer's buttocks when performing the operation of closing the foot at the time of wearing. It can be seen that it provides a more comfortable wearing feeling with less discomfort.

[Angle prevention]
The sanitary napkins of Example 1 and Comparative Example were fixed to shorts and attached to a dynamic model of a human body. When the cross section along the width direction of the sanitary napkin after the dynamic model was allowed to walk for 30 minutes, the absorbent body of the sanitary napkin of the comparative example was bent in an M shape. On the other hand, the sanitary napkin absorbent body of the example is bent in a substantially trapezoidal shape with the central portion in the width direction being kept relatively flat, and the depression in the center in the width direction as in the comparative example is almost not. There wasn't.
From these results, it can be seen that the sanitary napkin of Example 1 is superior in terms of fit to the wearer's skin as compared with the sanitary napkin of the comparative example.

FIG. 1 is a perspective view showing an embodiment of the absorbent body and absorbent article of the present invention. FIG. 2 is a schematic cross-sectional view showing a cross section taken along line II-II in FIG. FIG. 3 is a schematic cross-sectional view of the absorber for explaining the liquid uptake of the absorber. FIG. 4 is a diagram showing an outline of an absorbent body production apparatus preferably used in the absorbent body production method of the present invention. FIG. 5 (a) is a perspective view showing an accumulation recess having a groove on the bottom surface, and FIG. 5 (b) is a cross-sectional view showing a state in which fiber material is deposited inside the accumulation recess. FIG. 6A is a perspective view showing a deposit (manufacturing intermediate) having a ridge, and FIG. 6B shows an absorber manufactured using the deposit of FIG. 6A. It is a perspective view showing typically. FIG. 7 is a diagram (corresponding to FIG. 2) showing another embodiment of the absorbent article of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sanitary napkin 12 Top sheet 13 Back sheet 14 Absorbent body 14A Deposited body (absorbent core)
14B Core Wrap Sheet 15 High Density Part 16 Low Density Part 10 Absorber Production Equipment 2 Rotating Drum 21 Accumulation Recess 3 Duct 4 Fiber Material Supply Part 42 Fiber Material 5 Scuffing Roll 6 Compressor 7 Vacuum Conveyor

Claims (7)

A vertically long absorbent body for an absorbent article,
A plurality of high-density portions and a plurality of low-density portions are formed to extend in the longitudinal direction of the absorber, and the high-density portions and the low-density portions are alternately arranged in the width direction of the absorber. Formed in the absorber.   The absorber according to claim 1, wherein the thickness of the absorber is substantially the same between the high-density portion and the low-density portion.   The high-density portion and the low-density portion pressurize a production intermediate having a plurality of ridges, and the portion where the ridges are crushed is a high-density portion, and the other portions are low-density portions. The absorber according to claim 1 or 2, wherein Between the skin contact surface and the non-skin contact surface, the absorber according to any one of claims 1 to 3 is arranged,
The absorbent article in which the high-density part and the low-density part of the absorbent body are formed in the excretion part facing part of the absorbent article. It is a manufacturing method of the absorber according to any one of claims 1 to 3,
A step of obtaining a deposit having a protruding portion corresponding to the groove by sucking and depositing the fiber material supplied on the air flow into a concave portion for accumulation having a groove on the bottom surface, and the obtained deposit The manufacturing method of the absorber which comprises pressurizing and crushing the said protruding item | line part.   6. Absorption according to claim 5, wherein together with the fiber material, one or more deodorants, antibacterial agents and water-absorbing polymers are supplied in an air stream and the mixture is sucked and deposited in the collecting recess. Body manufacturing method.   After the step of obtaining the deposit, one or more deodorizers, antibacterial agents, and water-absorbing polymers are sprayed on the volume of the fiber material, and the step of crushing the ridges on the volume after spraying is performed. The manufacturing method of the absorber of Claim 5.

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