Absorbent body and absorbent article provided with the absorbent body

Abstract

An absorber, comprising: a base material formed of a non-woven fabric and permeable to liquids; an upper SAP layer disposed on the front surface of the base material and formed of SAP particles, where SAP is a superabsorbent polymer; and a lower SAP layer disposed on the rear surface of the base material and formed of SAP particles, where SAP is a superabsorbent polymer, wherein the liquid permeability of the upper SAP layer is 30 ml / min or higher, the liquid permeability of the lower SAP layer is lower than 30 ml / min, the liquid absorption rate of the upper SAP layer is lower than 35 g / g, the liquid absorption rate of the lower SAP layer is 35 g / g or higher, and in the central portion in the width direction of the base material, the upper SAP layer is disposed on both sides in the width direction of the base material and extends in the longitudinal direction of the base material.

Description

[0001] This patent application is a divisional application of the application with the application number 202080013901.8 (PCT / JP2020 / 006868) and the title of "Absorbent Body and Absorbent Article Provided with Absorbent Body", which was filed on February 20, 2020. Technical Field

[0002] The present invention relates to an absorbent body including SAP, which is a superabsorbent polymer. Background Art

[0003] Absorbent articles such as disposable diapers, urine pads, and sanitary products include an absorbent body that absorbs liquids such as urine and body fluids. Pulp or a superabsorbent polymer (SAP) is used in the absorbent body. The absorbent body is formed in a thin sheet shape, pad shape, etc. For example, PTL (Patent Literature) 1 discloses an absorbent composite in which SAP particles are fixed to a nonwoven fabric substrate or the like using an adhesive such as a thermoplastic resin.

[0004] Prior Art Documents

[0005] Patent Literature

[0006] [PTL 1] Japanese Patent Laid-Open No. 2000-24033 Summary of the Invention

[0007] Technical Problem

[0008] In the absorbent body in which SAP particles are fixed to a nonwoven fabric substrate, the SAP absorbs and retains liquids. However, there is a risk that the liquid that has moved to the end of the nonwoven fabric through the surface or inside of the nonwoven fabric substrate may leak from the absorbent body without being absorbed by the SAP.

[0009] In view of this, an object of the present invention is to provide a technique capable of suppressing liquid leakage.

[0010] Solution

[0011] To solve the above problems, in the present invention, SAP layers including SAP particles are provided on the front surface and the back surface of a substrate formed of a nonwoven fabric, and the SAP is a superabsorbent polymer.

[0012] Specifically, the present invention is an absorbent body including: a substrate formed of a nonwoven fabric; a first SAP layer disposed on both sides in the width direction of the front surface of the substrate along the longitudinal direction of the substrate and containing SAP particles, the SAP being a superabsorbent polymer; and a second SAP layer disposed on the back surface of the substrate and containing the SAP particles.

[0013] In the above absorber, grooves extending in the longitudinal direction of the base material may be formed on the front surface side of the base material and in the central portion in the width direction of the base material.

[0014] The above absorber may include: a first non-woven fabric sheet arranged to cover the front surface of the base material; and a second non-woven fabric sheet arranged to cover the back surface of the base material.

[0015] The above absorber may include: a wrapper chip covering the outer periphery of the absorbent composite, the absorbent composite being configured to include a base material, a first SAP layer, a second SAP layer, a first non-woven fabric sheet, and a second non-woven fabric sheet.

[0016] Furthermore, the present invention may be an absorbent article for absorbing urine discharged by a wearer, the absorbent article including: a liquid-impermeable backsheet; a liquid-permeable topsheet joined to the backsheet; and any one of the above absorbers disposed between the backsheet and the topsheet.

[0017] Advantages of the Invention

[0018] According to the present invention, liquid leakage can be suppressed. Brief Description of the Drawings

[0019] Figure 1 is a plan view of an absorber according to a first embodiment.

[0020] Figure 2 is a cross-sectional view of an absorber according to a first embodiment.

[0021] Figure 3 is a cross-sectional view of an absorber according to a first embodiment.

[0022] Figure 4 is a plan view of an absorber according to a first embodiment.

[0023] Figure 5 is a cross-sectional view of an absorber according to a first embodiment.

[0024] Figure 6 is a cross-sectional view of an absorber according to a first embodiment.

[0025] Figure 7 is a plan view of an absorber according to a second embodiment.

[0026] Figure 8 is a cross-sectional view of an absorber according to a second embodiment.

[0027] Figure 9 is a plan view of an absorber according to a second embodiment.

[0028] Figure 10 is a cross-sectional view of an absorber according to a second embodiment.

[0029] Figure 11 It is a cross-sectional view of an absorber according to the second embodiment.

[0030] Figure 12 It is a plan view of an absorber according to the third embodiment.

[0031] Figure 13 It is a cross-sectional view of an absorber according to the third embodiment.

[0032] Figure 14 It is a plan view of an absorber according to the third embodiment.

[0033] Figure 15 It is a cross-sectional view of an absorber according to the third embodiment.

[0034] Figure 16 It is a cross-sectional view of an absorber according to the third embodiment.

[0035] Figure 17 It is a plan view of an absorber according to the third embodiment.

[0036] Figure 18 It is a cross-sectional view of an absorber according to the third embodiment.

[0037] Figure 19 It is a plan view of an absorber according to the fourth embodiment.

[0038] Figure 20 It is along Figure 19 The cross-sectional view of the absorber when cut along the A-A cross-section shown.

[0039] Figure 21 It is similar to Figure 20 The cross-sectional view of an absorber similar to the absorber shown.

[0040] Figure 22 It is a figure showing the first example of the part with a waterproof finish.

[0041] Figure 23 It is a figure showing the second example of the part with a waterproof finish.

[0042] Figure 24 It is along Figure 19 The cross-sectional view of the absorber when cut along the B-B cross-section shown.

[0043] Figure 25 It is similar to Figure 20 The cross-sectional view of an absorber similar to the absorber shown.

[0044] Figure 26 It is a plan view of an absorber according to the fifth embodiment.

[0045] Figure 27It is a cross-sectional view of an absorber according to the fifth embodiment.

[0046] Figure 28 It is a plan view of an absorber according to the fifth embodiment.

[0047] Figure 29 It is a cross-sectional view of an absorber according to the fifth embodiment.

[0048] Figure 30 It is a cross-sectional view of an absorber according to the fifth embodiment.

[0049] Figure 31 It is a perspective view of a tape-type disposable diaper.

[0050] Figure 32 It is an exploded perspective view of a diaper.

[0051] Figure 33 It is a cross-sectional view when the crotch region is cut along the width direction of the crotch region.

[0052] Figure 34 It is a cross-sectional view when the crotch region is cut along the width direction of the crotch region. Detailed Description of the Invention

[0053] Embodiments of the present invention will be described below. The embodiments described below only represent examples of embodiments of the present invention and are not intended to limit the technical scope of the present invention to the following aspects.

[0054] <First Embodiment>

[0055] An absorber according to the first embodiment of the present invention will be described. The absorber in which SAP particles are fixed to a non-woven fabric substrate uses SAP to absorb and retain liquid. When SAP absorbs urine, the absorber swells as a whole. In the absorber, compared with other regions, the position facing the urethral orifice absorbs urine and swells in the early stage of the urination period. In the absorber, if the position facing the urethral orifice swells in the early stage of the urination period, there is a risk that the discharged urine may subsequently flow in the width direction of the absorber. When a liquid such as urine flows in the width direction of the absorber, there is a risk that the liquid may leak.

[0056] In view of this, the object of the present embodiment is to provide a technique capable of suppressing liquid leakage.

[0057] To solve the above problems, in the present embodiment, an SAP layer is provided, and the SAP layer is disposed on the front surface of the liquid diffusion layer on both sides in the width direction of the liquid diffusion layer along the central portion in the width direction of the liquid diffusion layer, and the SAP layer extends in the longitudinal direction of the liquid diffusion layer, and the liquid diffusion layer is formed of a non-woven fabric.

[0058] Specifically, this embodiment is an absorber, comprising: a liquid diffusion layer formed of a nonwoven fabric; and a SAP layer including SAP particles that are superabsorbent polymers, the SAP layer being disposed on the front surface of the liquid diffusion layer on both sides in the width direction of the liquid diffusion layer at the central portion in the width direction of the liquid diffusion layer and extending in the longitudinal direction of the liquid diffusion layer.

[0059] In the above absorber, grooves can be formed on the front surface side of the liquid diffusion layer at the central portion in the width direction and along the SAP layers on both sides.

[0060] The above absorber may include: a first nonwoven fabric sheet disposed to cover the front surface of the liquid diffusion layer; and a second nonwoven fabric sheet disposed to cover the rear surface of the liquid diffusion layer.

[0061] The above absorber may include: a wrapper chip covering the outer periphery of the absorbent complex configured to include the liquid diffusion layer, the SAP layer, the first nonwoven fabric sheet, and the second nonwoven fabric sheet.

[0062] Furthermore, this embodiment may be an absorbent article for absorbing liquid discharged by a wearer, and may be an absorbent article for absorbing liquid discharged by a wearer, the absorbent article including: a liquid-impermeable backsheet; a liquid-permeable topsheet joined to the backsheet; and the above absorber disposed between the backsheet and the topsheet.

[0063] According to this embodiment, liquid leakage can be suppressed.

[0064] Figure 1 It is a plan view of the absorber according to the first embodiment. The absorber 6A is formed in a sheet shape having a rectangular shape in the plan view. Figure 1 A state is shown in which, when the absorber 6A is disposed in an absorbent article such as a diaper, the absorber 6A is observed from the front surface side on the side of the skin-opposing surface opposite to the skin of the wearer.

[0065] Figure 2 is when along Figure 1 It is a cross-sectional view of the absorber 6A when cut along the A-A cross-section shown (a cross-section along the width direction of the absorber 6A). The absorber 6A has a uniform cross-section throughout the longitudinal direction. Although, in Figure 2 a gap is shown to be provided between the corresponding components of the absorber 6A for ease of understanding, in reality, it is difficult to form a gap between the corresponding components.

[0066] The absorber 6A includes a liquid diffusion layer 60. The liquid diffusion layer 60 is formed in a rectangular sheet shape. For the liquid diffusion layer 60, a large nonwoven fabric having a thickness of about 1 mm to 10 mm and manufactured by an air-through method, a needle punching method, etc. is used.

[0067] The absorber 6A includes SAP layers 62L and 62R which are arranged on the front surface of the liquid diffusion layer 60, and the SAP layers include SAP (Super Absorbent Polymer) particles which are highly absorbent polymers. In this case, when the absorber 6A is arranged in the absorbent article, the front surface of the liquid diffusion layer 60 is arranged on the side of the skin-facing surface, and the rear surface of the liquid diffusion layer 60 is arranged on the side of the non-skin-facing surface, which is the side opposite to the side of the skin-facing surface. The central portions of the SAP layers 62L and 62R in the width direction are arranged on the front surface of the liquid diffusion layer 60 on both sides in the width direction of the liquid diffusion layer 60 and extend in the longitudinal direction of the liquid diffusion layer 60. It should be noted that the longitudinal direction of the liquid diffusion layer 60 is perpendicular to the width direction of the liquid diffusion layer 60.

[0068] When the absorber 6A is arranged in the absorbent article, the SAP layer 62L is located on the left side of the wearer of the absorbent article, and the SAP layer 62R is located on the right side of the wearer of the absorbent article. The SAP layers 62L and 62R are formed by adhering a plurality of SAP particles to the front surface of the liquid diffusion layer 60 using an adhesive. In the SAP layers 62L and 62R, the SAP particles are arranged substantially uniformly. The liquid diffusion layer 60 holds the SAP layers 62L and 62R. The SAP layers 62L and 62R extend along the entire longitudinal direction of the liquid diffusion layer 60.

[0069] The SAP absorbs liquids that are 10 to 100 times its own weight. For example, as the SAP, SAP that is in a granular state before liquid absorption is used. The SAP layers 62L and 62R absorb and hold the liquids diffused by the liquid diffusion layer 60.

[0070] As described above, on the front surface side (the side of the skin-facing surface) of the liquid diffusion layer 60 of the absorber 6A, the SAP is not provided in the central portion in the width direction, while the SAP layers 62L and 62R are arranged on both sides in the width direction. Figure 3 is associated with Figure 2Cross-sectional view of a similar absorber 6A, showing the state in which the SAP layers 62L and 62R have absorbed liquid and swollen. During urination, the SAP layers 62L and 62R that have absorbed urine and swollen act as dams. Since the SAP layers 62L and 62R act as dams, a groove 67 is formed at the center in the width direction of the liquid diffusion layer 60, and the groove extends along the SAP layers 62L and 62R (dams), or in other words, extends in the longitudinal direction of the liquid diffusion layer 60. When the absorber 6A is disposed in an absorbent article, the groove 67 is formed at a position in the absorbent article that is opposite the urethral orifice (hereinafter referred to as the "urethral orifice opposite position"), so that urine discharged by the wearer easily flows into the groove 67. In the final stage of the current urination or during the next urination, the absorber 6A uses the groove 67 to diffuse urine in the longitudinal direction of the liquid diffusion layer 60. Therefore, since the absorber 6A diffuses urine over the entire liquid diffusion layer 60, the absorption rate and the diffusion rate can be maintained even during the next and subsequent urinations. In addition, when the wearer of the absorbent article is male, the groove 67 can be formed at a position opposite the urethral orifice at the tip of the penis, and the urination direction from the urethral orifice can be guided by the groove 67.

[0071] In addition, since the absorber 6A uses the liquid diffusion layer 60 to diffuse urine over the entire liquid diffusion layer 60, the SAP layers 62L and 62R can absorb urine uniformly, and the SAP layers 62L and 62R can swell substantially uniformly. Therefore, the absorber 6A can prevent a depression from being formed in the dam formed by the SAP layers 62L and 62R when only a part of the SAP layers 62L and 62R swells to form an opening in the dam, prevent urine from leaking out of the hole, and thus inhibit urine leakage. In addition, the absorber 6A temporarily holds the urine that has been diffused over the entire liquid diffusion layer 60 with the liquid diffusion layer 60, and allows the urine to be absorbed and held by the SAP layers 62L and 62R over time. Therefore, the absorber 6A can uniformly absorb and hold urine in the SAP layers 62L and 62R.

[0072] In addition, the absorber 6A includes: an SAP layer 63, which is disposed on the rear surface of the liquid diffusion layer 60 and includes SAP particles. The SAP layer 63 is formed over substantially the entire area of the rear surface of the liquid diffusion layer 60. The SAP layer 63 is formed by adhering a plurality of SAP particles to the rear surface of the liquid diffusion layer 60 using an adhesive. In the SAP layer 63, the SAP particles are arranged substantially uniformly. The liquid diffusion layer 60 holds the SAP layer 63. By providing the SAP layer 63, the absorber 6A increases the liquid absorption amount and the holding amount as a whole. Alternatively, the SAP particles may be included in the gaps in the liquid diffusion layer 60.

[0073] In addition, the absorber 6A includes: a first nonwoven fabric sheet 65 disposed to cover the front surface of the liquid diffusion layer 60; and a second nonwoven fabric sheet 66 disposed to cover the rear surface of the liquid diffusion layer 60. A liquid-permeable nonwoven fabric is used as the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66. For example, an air-laid nonwoven fabric is used as the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66. The first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66 cause the liquid to diffuse in the width direction and the longitudinal direction of the absorber 6A. Therefore, the absorber 6A prevents the liquid such as urine discharged by the wearer from gathering at the center in the width direction or the center in the longitudinal direction of the absorber 6A. In addition, the provision of the first nonwoven fabric sheet 65 improves the wearability of the absorbent article for the wearer.

[0074] In addition, in the absorber 6A, grooves may be pre-formed in the liquid diffusion layer 60. Figure 4 is similar to Figure 1 a plan view. Figure 5 is a cross-sectional view of the absorber 6A when cut along the Figure 4 B-B cross-section shown (a cross-section along the width direction of the absorber 6A). Grooves 67 are formed on the front surface side of the liquid diffusion layer 60 in the central portion in the width direction of the liquid diffusion layer 60 along the SAP layers 62L and 62R on both sides. When the absorber 6A is disposed in the absorbent article, the grooves 67 are formed at positions opposite to the urethral orifice so that the urine discharged by the wearer easily flows into the grooves 67. After the liquid diffusion layer 60 is formed, the grooves 67 are formed by applying pressure from the front surface side of the liquid diffusion layer 60 to the groove forming region. Alternatively, when manufacturing the liquid diffusion layer 60, the grooves 67 may be formed by reducing the basis weight of the nonwoven fabric in the groove forming region.

[0075] In this way, by pre-setting the grooves 67 on the front surface side (the side of the skin-facing surface) of the absorber 6A, when the SAP layers 62L and 62R expand and form dikes, the grooves 67 can become deeper to increase the volume of the grooves 67, and a larger amount of urine can be guided through the grooves 67. Therefore, the absorber 6A can use the entire liquid diffusion layer 60 to diffuse a large amount of urine, and can suppress urine leakage even when a large amount of urine is discharged.

[0076] In addition, in the absorber 6A, the entire absorbent composite configured to include the liquid diffusion layer 60, the SAP layers 62L, 62R and 63, and the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66 is covered with the wrapper chip 68. Figure 6 is similar to Figure 2 a cross-sectional view of the absorber 6A similar to the absorber 6A shown. As Figure 6As shown, the wrapper chip 68 includes: a first sheet 68A that covers one side of the first non-woven fabric sheet 65; and a second sheet 68B that covers the end portion in the width direction of the first non-woven fabric sheet 65, the side surface of the liquid diffusion layer 60, and one side of the second non-woven fabric sheet 66. The first sheet 68A and the second sheet 68B are joined and integrally wrap the entire absorbent composite. For example, a liquid-permeable thin paper such as a tissue paper or a non-woven fabric is used as the wrapper chip 68. The wrapper chip 68 can cause the liquid discharged by the wearer to diffuse over the entire absorbent body 6A. Alternatively, the wrapper chip 68 can be composed of a single sheet.

[0077] <Second Embodiment>

[0078] The absorbent body according to the second embodiment of the present invention will be described. In the absorbent body, it is preferable to hold the liquid at a certain distance from the wearer's skin. However, in the absorbent body in which the SAP particles are fixed to the non-woven fabric substrate, since a certain amount of SAP particles required to absorb and hold a predetermined amount of liquid are only arranged on the rear surface side of the substrate at a certain distance from the wearer's skin, the density of SAP on the rear surface side increases excessively, and thus gel blockage is more likely to occur after the SAP absorbs the liquid. Therefore, although it is preferable to arrange the SAP on both surfaces of the non-woven fabric substrate, when the SAP arranged on the front surface of the non-woven fabric substrate becomes a gel, the liquid permeability on the front surface side decreases, preventing the liquid from diffusing over the entire absorbent body and causing liquid leakage. For this reason, a balance between the liquid absorption rate and the liquid permeability is required on the front surface of the non-woven fabric substrate in the absorbent body. In addition, when the SAP becomes a gel and the liquid holding amount decreases, backflow occurs, in which the liquid initially absorbed by the absorbent body is released to the wearer's skin side.

[0079] In view of this, the object of the present embodiment is to provide a technique capable of suppressing liquid leakage and backflow.

[0080] To solve the above problems, in the present embodiment, the liquid permeability of the upper SAP layer is increased, and the liquid absorption rate of the lower SAP layer is increased.

[0081] Specifically, the present embodiment is an absorbent body including: a substrate formed of a non-woven fabric and permeable to liquid; an upper SAP layer arranged on the front surface of the substrate and containing SAP particles that are superabsorbent polymers; and a lower SAP layer arranged on the rear surface of the substrate and containing SAP particles that are superabsorbent polymers, wherein the liquid permeability of the upper SAP layer is 30 (ml / min) or higher, and the liquid absorption rate of the lower SAP layer is 35 (g / g) or higher.

[0082] In the above absorbent body, the upper SAP layer can be arranged on both sides in the width direction of the substrate along the central portion in the width direction and can extend in the longitudinal direction of the substrate.

[0083] In the above absorber, the groove can be formed on the front surface side of the substrate at the central portion in the width direction and along the upper SAP layers on both sides.

[0084] The above absorber may include: a first nonwoven fabric sheet arranged to cover the front surface of the substrate; and a second nonwoven fabric sheet arranged to cover the back surface of the substrate.

[0085] The above absorber may include: a wrapper chip that covers the outer periphery of the absorbent composite, and the absorbent composite is configured to include a substrate, an upper SAP layer, a lower SAP layer, a first nonwoven fabric sheet, and a second nonwoven fabric sheet.

[0086] In addition, an absorbent article can be provided, which absorbs the liquid discharged by the wearer and includes: a liquid-impermeable backsheet; a liquid-permeable topsheet bonded to the backsheet; and the above absorber disposed between the backsheet and the topsheet.

[0087] According to this embodiment, liquid leakage and backflow can be suppressed.

[0088] Figure 7 It is a plan view of an absorber according to the second embodiment. The absorber 6 is formed in a sheet shape having a rectangular shape in the plan view. Figure 7 A state is shown in which, when the absorber 6 is disposed in an absorbent article such as a diaper, when viewed from the front surface side, the absorber 6 is on the side of the skin-facing surface opposite to the skin of the wearer.

[0089] Figure 8 It is when along Figure 7 The cross-sectional view of the absorber 6 when cut along the A-A cross-section shown (the cross-section along the width direction of the absorber 6). The absorber 6 has a uniform cross-section in the entire longitudinal direction. Although in Figure 8 a gap is shown to be provided between the corresponding components of the absorber 6 for easy understanding, in reality, it is difficult to form a gap between the corresponding components.

[0090] The absorber 6 includes a substrate 61. The substrate 61 is formed in a rectangular sheet shape. For the substrate 61, a large nonwoven fabric having a thickness of about 1 mm to 10 mm and manufactured by an air-through method or a needle punching method or the like is used. The substrate 61 penetrates and diffuses the liquid.

[0091] The absorber 6 includes SAP layers 62L and 62R (examples of "upper SAP layers"), which are arranged on the front surface of the substrate 61, and the SAP layers 62L and 62R include SAP (Super Absorbent Polymer) particles that are highly absorbent polymers. In this case, when the absorber 6 is arranged in the absorbent article, the front surface of the substrate 61 is arranged on the side of the skin-facing surface, and the rear surface of the substrate 61 is arranged on the side of the non-skin-facing surface, which is the side opposite to the side of the skin-facing surface. The central portions of the SAP layers 62L and 62R in the width direction are arranged on the front surface of the substrate 61 on both sides in the width direction of the substrate 61 and extend in the longitudinal direction of the substrate 61. It should be noted that the longitudinal direction of the substrate 61 is perpendicular to the width direction of the substrate 61.

[0092] When the absorber 6 is arranged in the absorbent article, the SAP layer 62L is located on the left side of the wearer of the absorbent article, and the SAP layer 62R is located on the right side of the wearer of the absorbent article. The SAP layers 62L and 62R are formed by adhering a plurality of SAP particles to the front surface of the substrate 61 using an adhesive. In the SAP layers 62L and 62R, the SAP particles are arranged substantially uniformly. The substrate 61 holds the SAP layers 62L and 62R. The SAP layers 62L and 62R extend along the entire longitudinal direction of the substrate 61.

[0093] In addition, the absorber 6 includes: an SAP layer 63 (an example of a "lower SAP layer"), which is arranged on the rear surface of the substrate 61 and includes SAP particles. The SAP layer 63 is formed over substantially the entire area of the rear surface of the substrate 61. The SAP layer 63 is formed by adhering a plurality of SAP particles to the rear surface of the substrate 61 using an adhesive. In the SAP layer 63, the SAP particles are arranged substantially uniformly. The substrate 61 holds the SAP layer 63. By providing the SAP layer 63, the absorber 6 as a whole increases the liquid absorption amount and retention amount. Alternatively, the SAP particles may be included in the gaps in the substrate 61.

[0094] The SAP absorbs liquids that are 10 to 100 times its own weight. For example, as the SAP, SAP in a particulate state before absorbing the liquid is used.

[0095] The SAP layers 62L and 62R have a higher liquid permeability than the SAP layer 63, but the SAP layer 63 has a higher liquid absorption rate than the SAP layers 62L and 62R. These properties can be set according to the type of SAP arranged in each SAP layer.

[0096] First, a method for measuring the liquid permeability will be described. The liquid permeability is defined by the volume (ml) of the liquid that permeates within 1 minute. First, a bioreactor (such as the bioreactor CF-30K manufactured by AS ONE CORPORATION etc.) with an inner diameter of 25.4 mm and equipped with a filter (such as the bioreactor filter 30 SUS manufactured by AS ONE CORPORATION etc.) is prepared. As the bioreactor, a bioreactor with markings for 60 ml and 40 ml liquid measurement values or a bioreactor with markings attached to the 60 ml and 40 ml liquid measurement values is used. Next, 150.0 ml (±1.5 ml) of a physiological saline solution with a concentration of 0.900% (±0.009%) and a temperature of 25°C (±2°C) is poured into a 200 ml volumetric beaker. Next, 0.320 g (±0.003 g) of SAP is added to the beaker and soaked for 30 minutes while stirring. Next, after putting all the contents in the beaker into the bioreactor, a cylindrical rod (with a diameter of 2 mm and a 150 um mesh size and a 25 mm diameter metal mesh assembled at its tip) is inserted into the inner cylinder of the bioreactor such that the metal mesh contacts the SAP, and a weight is placed on top of the cylindrical rod such that a load of 0.3 psi is applied to the SAP. Next, the cock of the bioreactor is opened to lower the liquid level inside the bioreactor until the liquid level is about 5 cm above the 60 ml line, and the liquid is left standing in this state for 1 minute. Next, the cock of the bioreactor is opened to measure the time (T1) required for the liquid level to drop from the 60 ml line to the 40 ml line. Additionally, a similar test is performed in a state without adding SAP to measure the time (T0).

[0097] The liquid permeability of SAP is obtained by substituting the T1 and T0 values obtained from the above test into the following equation (1).

[0098] Liquid permeability (ml / min) = 20 / (T1 - T0)...(1)

[0099] SAP with a liquid permeability of 30 (ml / min) or higher is used in the SAP layers 62L and 62R. Thus, the SAP layers 62L and 62R have a liquid permeability of 30 (ml / min) or higher. It should be noted that the liquid permeability of the SAP layer 63 is lower than 30 (ml / min).

[0100] Next, the method for measuring the liquid absorption rate will be described. The liquid absorption rate is defined as the amount of liquid absorbed per 1 g of SAP (g). First, a nylon sheet with a mesh size of 57 μm is cut into a size with a longitudinal dimension of 10 cm and a transverse dimension of 40 cm. The cut nylon sheet is folded in half in the longitudinal direction, and both ends are heat-sealed to form a nylon bag in the shape of a 10 cm × 20 cm bag. 1.00 g (±0.01 g) of SAP is placed into the nylon bag. Next, the nylon bag is placed in a physiological saline solution with a concentration of 0.900% (±0.009%) and a temperature of 25°C (±2°C) and soaked for 1 hour. Next, the nylon bag is taken out and drained for 15 minutes. Next, dehydration is performed for 90 seconds using a centrifugal dehydrator with a centrifugal force set to 150 G, and the weight (A) of the nylon bag is measured. Additionally, a similar nylon bag without SAP is generated to perform a similar test, and the weight (B) of the nylon bag is measured.

[0101] The liquid absorption rate (liquid absorption amount) of the SAP is obtained by substituting the A and B values obtained from the above test into the following equation (2).

[0102] Liquid absorption rate (g / g) = (A - B) / amount of collected SAP...(2)

[0103] In the SAP layer 63, SAP with a liquid absorption rate of 35 (g / g) or higher is used. Therefore, the SAP layer 63 has a liquid absorption rate of 35 (g / g) or higher. It should be noted that the liquid absorption rates of the SAP layers 62L and 62R are both lower than 35 (g / g).

[0104] Generally, in an absorber including SAP, the closer the SAP is to the wearer's skin, the greater the amount of urine absorbed by the SAP. Therefore, after the absorber absorbs urine multiple times, the SAP close to the wearer's skin becomes swollen, and the liquid permeability decreases, making it difficult for urine to penetrate into the absorber or enter the side (lower side) of the non-skin-facing surface. As a result, there is a risk that urine may flow on top of the skin-facing surface side of the absorber and cause leakage.

[0105] When the absorber 6 according to the present embodiment is disposed in an absorbent article, the SAP layers 62L and 62R are located on the side of the skin-facing surface, and the SAP layer 63 is located on the side of the non-skin-facing surface. In other words, the SAP layer 63 is arranged to be farther from the wearer's skin than the SAP layers 62L and 62R. Additionally, in the absorber 6, the SAP layers 62L and 62R have a liquid permeability of 30 (ml / min) or higher. Therefore, even after absorbing urine multiple times, the absorber 6 can ensure the liquid permeability of the SAP layers 62L and 62R arranged closer to the wearer's skin, enabling urine to more easily penetrate into the base material 61 or enter the SAP layer 63, and can suppress urine leakage. Further, in the absorber 6, the SAP layer 63 has a liquid absorption rate of 35 (g / g) or higher. Since the absorber 6 according to the present embodiment holds a relatively large amount of urine with the SAP layer 63 disposed at a certain distance from the wearer's skin, the wet feeling on the skin surface can be suppressed and a decline in wearability can be prevented. Additionally, by disposing the SAP layers on the front and back surfaces of the base material 61, the absorber 6 can arrange the amount of SAP required to absorb and hold a predetermined amount of liquid in the distributed material between the SAP layers 62L, 62R, and 63, prevent the SAP density in the SAP layers 62L, 62R, and 63 from becoming too high, and prevent the occurrence of gel blockage. Furthermore, the absorber 6 can prevent the SAP in the SAP layers 62L, 62R, and 63 from turning into gel, and by preventing a decrease in the liquid absorption / holding amount in the SAP layers 62L, 62R, and 63, the absorber 6 can suppress backflow, in which the initially absorbed liquid flows out to the wearer's skin side.

[0106] Further, on the front surface side (the side of the skin-facing surface) of the base material 61, the SAP is not provided in the central portion in the width direction, but the SAP layers 62L and 62R are arranged on both sides in the width direction. When the absorber 6 is disposed in an absorbent article, the central portion in the width direction on the front surface side of the base material 61 is arranged at a position facing the urethral orifice (hereinafter referred to as the "urethral orifice facing position"). In the absorber 6, no SAP is provided at the urethral orifice facing position, enabling the discharged urine to be introduced into the base material 61 and diffused over the entire base material 61. Alternatively, a SAP layer may be formed on the entire front surface side of the base material 61. Even in this case, since the liquid permeability of the SAP layer arranged closer to the wearer's skin is high as described above, the absorber 6 enables urine to more easily penetrate into the base material 61 or enter the SAP layer 63, and can suppress urine leakage.

[0107] In addition, the absorber 6 includes: a first nonwoven fabric sheet 65 disposed to cover the front surface of the base material 61; and a second nonwoven fabric sheet 66 disposed to cover the rear surface of the base material 61. A liquid-permeable nonwoven fabric is used as the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66. For example, an air-laid nonwoven fabric is used as the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66. The first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66 spread the liquid in the width direction and the longitudinal direction of the absorber 6. Accordingly, the absorber 6 prevents the liquid such as urine discharged by the wearer from gathering at the center in the width direction or the center in the longitudinal direction of the absorber 6. In addition, the provision of the first nonwoven fabric sheet 65 improves the wearing comfort of the absorbent article for the wearer.

[0108] In addition, in the absorber 6, grooves can be formed in the base material 61. Figure 9 is similar to Figure 7 a plan view. Figure 10 is a cross-sectional view of the absorber 6 when cut along the Figure 9 B-B cross-section shown (a cross-section along the width direction of the absorber 6). Grooves 67 are formed on the front surface side of the base material 61 at the center portion in the width direction of the base material 61 along the SAP layers 62L and 62R on both sides. When the absorber 6 is disposed in the absorbent article, the grooves 67 are formed at positions opposite to the urethral orifice such that the urine discharged by the wearer easily flows into the grooves 67. The grooves 67 are formed after the formation of the base material 61 by applying pressure from the front surface side of the base material 61 to the groove-forming region. Alternatively, when manufacturing the base material 61, the grooves 67 can be formed by reducing the basis weight of the nonwoven fabric in the groove-forming region.

[0109] In this way, by providing the grooves 67 on the front surface side (skin-facing surface side) of the absorber 6, the urine can be diffused in the entire longitudinal direction of the base material 61, and leakage of the urine can be suppressed even when a large amount of urine is discharged.

[0110] In addition, in the absorber 6, the entire absorbent composite configured to include the base material 61, the SAP layers 62L, 62R, and 63, and the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66 is covered with the wrapper chip 68. Figure 11 is similar to Figure 8 the absorber shown. Figure 11As shown, the wrap chip 68 includes: a first sheet 68A that covers one side of the first non-woven fabric sheet 65; and a second sheet 68B that covers an end portion in the width direction of the first non-woven fabric sheet 65, a side surface of the base material 61, and one side of the second non-woven fabric sheet 66. The first sheet 68A and the second sheet 68B are joined and integrally wrap the entire absorbent complex. For example, a liquid-permeable thin paper such as a tissue paper or a non-woven fabric is used as the wrap chip 68. The wrap chip 68 can diffuse the liquid discharged by the wearer over the entire absorbent body. Alternatively, the wrap chip 68 may be composed of a single sheet.

[0111] <Third Embodiment>

[0112] The absorbent body according to the third embodiment of the present invention will be described. In the absorbent body, it is preferable to hold the liquid at a certain distance from the skin of the wearer. However, in the absorbent body in which the SAP particles are fixed to the non-woven fabric base material, since a certain amount of SAP particles required to absorb and hold a predetermined amount of liquid are only arranged on the rear surface side of the base material at a certain distance from the skin of the wearer, the density of SAP on the rear surface side increases excessively, and thus gel blockage is more likely to occur after the SAP absorbs the liquid. Therefore, although it is preferable to arrange SAP on both surfaces of the non-woven fabric base material, when the SAP arranged on the front surface of the non-woven fabric base material becomes a gel, the liquid permeability on the front surface side decreases, preventing the liquid from diffusing over the entire absorbent body, and liquid leakage occurs. For this reason, a balance between the liquid absorption rate and the liquid permeability is required on the front surface of the non-woven fabric base material in the absorbent body. In addition, when the SAP becomes a gel and the liquid holding amount decreases, a backflow occurs in which the liquid initially absorbed by the absorbent body is released to the skin side of the wearer.

[0113] In view of this, the object of the present embodiment is to provide a technique capable of suppressing liquid leakage and backflow.

[0114] To solve the above problems, in the present embodiment, the upper SAP layer has a smaller amount of SAP than the lower SAP layer.

[0115] Specifically, the present embodiment is an absorbent body including: a base material formed of a non-woven fabric and permeable to liquid; an upper SAP layer arranged on the front surface of the base material and containing SAP particles that are superabsorbent polymers; and a lower SAP layer arranged on the rear surface of the base material and containing SAP particles that are superabsorbent polymers, wherein the upper SAP layer has a smaller amount of SAP than the lower SAP layer.

[0116] In the above absorbent body, the upper SAP layer may be disposed on both sides in the width direction of the substrate at the central portion in the width direction, may extend in the longitudinal direction of the substrate, and the groove may be formed on the front surface side of the substrate at the central portion in the width direction of the upper SAP layer on both sides.

[0117] In the above absorbent body, the upper SAP layer may have a higher liquid permeability than the lower SAP layer.

[0118] The above absorbent body may include: a first non-woven fabric sheet disposed to cover the front surface of the substrate; and a second non-woven fabric sheet disposed to cover the back surface of the substrate.

[0119] The above absorbent body may include: a wrapper chip covering the outer periphery of the absorbent composite, the absorbent composite being configured to include a substrate, an upper SAP layer, a lower SAP layer, a first non-woven fabric sheet, and a second non-woven fabric sheet.

[0120] The above absorbent body may include a compression groove formed by compressing the wrapper chip, the first non-woven fabric sheet, and the substrate.

[0121] In addition, an absorbent article may be provided, which absorbs liquid discharged by a wearer and includes: a liquid-impermeable backsheet; a liquid-permeable topsheet bonded to the backsheet; and the above absorbent body disposed between the backsheet and the topsheet.

[0122] The above absorbent article may include a compression groove formed by compressing a part of the substrate of the absorbent body from the topsheet.

[0123] According to the present embodiment, liquid leakage and backflow can be suppressed.

[0124] Figure 12 It is a plan view of an absorbent body according to the third embodiment. The absorbent body 6C is formed in a sheet shape having a rectangular shape in the plan view. Figure 12 A state is shown in which, when the absorbent body 6C is disposed in an absorbent article such as a diaper, viewed from the front surface side, the absorbent body 6C is on the side of the skin-facing surface opposite to the skin of the wearer.

[0125] Figure 13 It is when along Figure 12 It is a cross-sectional view of the absorbent body 6C when cut along the A-A cross-section shown (a cross-section along the width direction of the absorbent body 6C). The absorbent body 6C has a uniform cross-section in the entire longitudinal direction. Although in Figure 13 it is shown that the corresponding components of the absorbent body 6C have gaps provided therebetween for easy understanding, in fact, it is difficult to form gaps between the corresponding components.

[0126] The absorber 6C includes a base material 61. The base material 61 is formed in a rectangular sheet shape. For the base material 61, a large non-woven fabric with a thickness of about 1 mm to 10 mm and manufactured by an air penetration method or a needle punching method or the like is used. The base material 61 permeates and diffuses liquids.

[0127] The absorber 6C includes SAP layers 62L and 62R (examples of "upper SAP layers"), the SAP layers 62L and 62R are disposed on the front surface of the base material 61, and the SAP layers 62L and 62R include SAP (Super Absorbent Polymer) particles which are highly absorbent polymers. In this case, when the absorber 6C is disposed in an absorbent article, the front surface of the base material 61 is disposed on the side of the skin-facing surface, and the rear surface of the base material 61 is disposed on the side of the non-skin-facing surface, which is the side opposite to the side of the skin-facing surface. The central portions of the SAP layers 62L and 62R in the width direction are disposed on the front surface of the base material 61 on both sides in the width direction of the base material 61, and extend in the longitudinal direction of the base material 61. It should be noted that the longitudinal direction of the base material 61 is perpendicular to the width direction of the base material 61.

[0128] When the absorber 6C is disposed in an absorbent article, the SAP layer 62L is located on the left side of the wearer of the absorbent article, and the SAP layer 62R is located on the right side of the wearer of the absorbent article. The SAP layers 62L and 62R are formed by adhering a plurality of SAP particles to the front surface of the base material 61 using an adhesive. In the SAP layers 62L and 62R, the SAP particles are arranged substantially uniformly. The base material 61 holds the SAP layers 62L and 62R. The SAP layers 62L and 62R extend along the entire longitudinal direction of the base material 61.

[0129] In addition, the absorber 6C includes: a SAP layer 63 (an example of "lower SAP layer"), which is disposed on the rear surface of the base material 61 and includes SAP particles. The SAP layer 63 is formed on substantially the entire area of the rear surface of the base material 61. The SAP layer 63 is formed by adhering a plurality of SAP particles to the rear surface of the base material 61 using an adhesive. In the SAP layer 63, the SAP particles are arranged substantially uniformly. The base material 61 holds the SAP layer 63. By providing the SAP layer 63, the absorber 6C as a whole increases the liquid absorption amount and retention amount. Alternatively, the SAP particles may be included in the gaps in the base material 61.

[0130] The SAP absorbs liquids that are 10 to 100 times its own weight. For example, as the SAP, SAP in a particulate state before absorbing liquids is used.

[0131] In this case, the SAP layers 62L and 62R are given a smaller amount of SAP than the SAP layer 63. The liquid absorption amount (liquid retention amount) in the SAP layer is proportional to the amount of SAP. By including the SAP layer 63 that contains a larger amount of SAP than the SAP layers 62L and 63R, the absorber 6C according to the present embodiment can suppress the leakage of liquid without overall reducing the liquid absorption amount and retention amount. In addition, by making the SAP layers 62L and 62R contain a smaller amount of SAP than the SAP layer 63, when the absorber 6C is disposed in the absorbent article, the SAP layer 63 at a certain distance from the wearer's skin can absorb and retain a larger amount of liquid than the SAP layers 62L and 62R closer to the skin. Therefore, since the absorber 6C retains a relatively large amount of urine with the SAP layer 63 disposed at a certain distance from the wearer's skin, the wet feeling on the skin surface can be suppressed and the deterioration of wearability can be prevented. It should be noted that the amount of SAP in the SAP layer can be defined by the basis weight or by the application dose (g).

[0132] In addition, the SAP layers 62L and 62R are given a higher liquid permeability than the SAP layer 63. These properties can be set according to the type of SAP disposed in each SAP layer. The liquid permeability is defined by the volume (ml) of the liquid that permeates in 1 minute. First, a biocolumn (for example, a biocolumn CF-30K manufactured by As One Corporation or the like) having an inner diameter of 25.4 mm and equipped with a filter (for example, a biocolumn filter 30 SUS manufactured by As One Corporation or the like) is prepared. As the biocolumn, a biocolumn with 60 ml and 40 ml liquid measurement marks or a biocolumn with marks attached to the 60 ml and 40 ml liquid measurements is used. Next, 150.0 ml (±1.5 ml) of a physiological saline solution having a concentration of 0.900% (±0.009%) and a temperature of 25°C (±2°C) is poured into a 200 ml volumetric beaker. Next, 0.320 g (±0.003 g) of SAP is added to the beaker and soaked for 30 minutes while stirring. Next, after putting all the contents in the beaker into the biocolumn, a cylindrical rod (having a diameter of 2 mm and a 150 um mesh size and a 25 mm diameter metal mesh assembled to its tip) is inserted into the inner cylinder of the biocolumn so that the metal mesh contacts the SAP, and a weight is placed on the top of the cylindrical rod so that a load of 0.3 psi is applied to the SAP. Next, the cock of the biocolumn is opened to lower the liquid level in the biocolumn until the liquid level is about 5 cm above the 60 ml line, and the liquid is allowed to stand in this state for 1 minute. Next, the cock of the biocolumn is opened to measure the time (T1) required for the liquid level to drop from the 60 ml line to the 40 ml line. In addition, a similar test is performed in a state where no SAP is added to measure the time (T0).

[0133] The liquid permeability of the SAP is obtained by substituting the T1 and T0 values obtained from the above tests into the following equation (3).

[0134] Liquid permeability (ml / min) = 20 / (T1 - T0)...(3)

[0135] In the SAP layers 62L and 62R, SAP with a liquid permeability of 30 (ml / min) or higher can be used. In this case, the SAP layers 62L and 62R have a higher liquid permeability than the SAP layer 63, which is 30 (ml / min) or higher. It should be noted that the liquid permeability of the SAP layer 63 is lower than 30 (ml / min).

[0136] Generally, in an absorber including SAP, the closer the SAP is to the wearer's skin, the greater the amount of urine absorbed by the SAP. Therefore, after the absorber has absorbed urine multiple times, the SAP closer to the wearer's skin becomes swollen, and the liquid permeability decreases, making it difficult for urine to penetrate into the absorber or enter the side (lower side) opposite to the skin surface. As a result, there is a risk that urine may flow on top of the skin-facing surface of the absorber and cause leakage.

[0137] When the absorber 6C according to the present embodiment is arranged in an absorbent article, the SAP layers 62L and 62R are located on the skin-facing surface side, and the SAP layer 63 is located on the non-skin-facing surface side. In other words, the SAP layer 63 is arranged farther from the wearer's skin than the SAP layers 62L and 62R. Additionally, in the absorber 6C, the SAP layers 62L and 62R are given a higher liquid permeability than the SAP layer 63. Therefore, even after absorbing urine multiple times, the absorber 6C can ensure the liquid permeability of the SAP layers 62L and 62R arranged closer to the wearer's skin, enabling urine to more easily penetrate into the base material 61 or enter the SAP layer 63, and can suppress urine leakage. Further, by arranging the SAP layers on the front and back surfaces of the base material 61, the absorber 6C can arrange the amount of SAP required to absorb and retain a predetermined amount of liquid in the distributed substances among the SAP layers 62L, 62R, and 63, prevent the SAP density in the SAP layers 62L, 62R, and 63 from becoming too high, and prevent the occurrence of gel blockage. Moreover, the absorber 6C can prevent the SAP in the SAP layers 62L, 62R, and 63 from becoming a gel, and by preventing a decrease in the liquid absorption / retaining amount in the SAP layers 62L, 62R, and 63, the absorber 6C can suppress backflow, in which the initially absorbed liquid flows out to the wearer's skin side.

[0138] In addition, on the front surface side of the base material 61 (the side of the skin-facing surface), instead of the SAP being provided in the central portion in the width direction, the SAP layers 62L and 62R are arranged on both sides in the width direction. When the absorber 6C is disposed in the absorbent article, the central portion in the width direction on the front surface side of the base material 61 is disposed at a position facing the urethral orifice (hereinafter referred to as the "urethral orifice facing position"). In the absorber 6C, no SAP is provided at the urethral orifice facing position so that the discharged urine can be introduced into the base material 61 and diffused over the entire base material 61. Alternatively, a SAP layer may be formed on the entire front surface side of the base material 61. Even in this case, since the liquid permeability of the SAP layer disposed closer to the wearer's skin as described above is high, the absorber 6C allows urine to more easily penetrate into the base material 61 or enter the SAP layer 63, and can suppress urine leakage.

[0139] In addition, the absorber 6C includes: a first nonwoven fabric sheet 65 disposed to cover the front surface of the base material 61; and a second nonwoven fabric sheet 66 disposed to cover the rear surface of the base material 61. A liquid-permeable nonwoven fabric is used as the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66. For example, an air-laid nonwoven fabric is used as the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66. The first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66 diffuse liquid in the width direction and the longitudinal direction of the absorber 6C. Therefore, the absorber 6C prevents a liquid such as urine discharged by the wearer from accumulating at the center in the width direction or the center in the longitudinal direction of the absorber 6C. In addition, the provision of the first nonwoven fabric sheet 65 improves the wearability of the absorbent article for the wearer.

[0140] Furthermore, in the absorber 6C, grooves may be formed in the base material 61. Figure 14 is similar to Figure 12 a plan view. Figure 15 is a cross-sectional view of the absorber 6C when cut along the Figure 14 B-B cross-section shown (a cross-section along the width direction of the absorber 6C). Grooves 67 are formed on the front surface side of the base material 61 in the central portion in the width direction of the base material 61 along the SAP layers 62L and 62R on both sides. When the absorber 6C is disposed in the absorbent article, the grooves 67 are formed at the urethral orifice facing position so that urine discharged by the wearer easily flows into the grooves 67. The grooves 67 are formed after the formation of the base material 61 by applying pressure from the front surface side of the base material 61 to the groove formation region. Alternatively, when manufacturing the base material 61, the grooves 67 may be formed by reducing the basis weight of the nonwoven fabric in the groove formation region.

[0141] In this way, by providing the groove 67 on the front surface side (skin-facing surface side) of the absorber 6C, urine can spread in the entire longitudinal direction of the base material 61, and urine leakage can be suppressed even when a large amount of urine is discharged.

[0142] In addition, in the absorber 6C, the entire absorbent composite configured to include the base material 61, the SAP layers 62L, 62R, and 63, and the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66 is covered with the wrapper chip 68. Figure 16 is similar to Figure 13 The cross-sectional view of the absorber 6C similar to the absorber shown. As Figure 16 shown, the wrapper chip 68 includes: a first sheet 68A that covers the first nonwoven fabric sheet 65 side; and a second sheet 68B that covers the end portion in the width direction of the first nonwoven fabric sheet 65, the side surface of the base material 61, and the second nonwoven fabric sheet 66 side. The first sheet 68A and the second sheet 68B are joined and integrally wrap the entire absorbent composite. For example, a liquid-permeable thin paper such as a tissue paper or a nonwoven fabric is used as the wrapper chip 68. The wrapper chip 68 can spread the liquid discharged by the wearer over the entire absorber 6C. Alternatively, the wrapper chip 68 may be composed of a single sheet.

[0143] In addition, compression grooves can be formed, which are formed by compressing the wrapper chip 68 and the first nonwoven fabric sheet 65 toward the front surface of the base material 61. Figure 17 is from Figure 16 The plan view of the absorber 6C when viewed from the first sheet 68a side of the wrapper chip 68 shown. When the absorber 6C is disposed in the absorbent article, the first sheet 68a is disposed on the skin-facing surface side. Compression grooves 70 and 71 are formed on the front surface of the first sheet 68a. The compression grooves 70 and 71 are formed linearly and obliquely with respect to the longitudinal direction of the absorber 6C in a plurality. The compression grooves 70 are formed in a plurality such that the compression grooves 70 face the paper surface and extend from the upper left corner to the lower right corner of the absorber 6C and are parallel to each other. In addition, the compression grooves 71 are formed in a plurality such that the compression grooves 71 face the paper surface and extend from the upper right corner to the lower left corner of the absorber 6C and are parallel to each other. The compression grooves 70 and the compression grooves 71 intersect each other at approximately a right angle. The compression grooves 70 and 71 are formed in a grid-like pattern as a whole. The formation pattern of the compression grooves 70 and 71 is not limited to this. For example, the compression grooves 70 and 71 may be formed to extend in the longitudinal direction of the absorber 6C or may be formed in a curved shape.

[0144] Figure 18 is when along Figure 17Cross-sectional view of the absorber 6C when cut along the C-C cross-section (cross-section along the width direction of the absorber 6C). The compression grooves 70 and 71 are formed by the compression package chip 68, the first non-woven fabric sheet 65, and the base material 61. In addition, the compression grooves 70 and 71 are formed to a depth that reaches a part of the base material 61 from the front surface side of the absorber 6C. The absorber 6C allows air to flow within the compression grooves 70 and 71 to improve liquid permeability. In addition, since the liquid flows within the compression grooves 70 and 71, the liquid diffusion rate is increased. In this way, the compression grooves 70 and 71 are provided to improve the liquid permeability of the absorber 6C and the liquid diffusion rate.

[0145] The compression grooves 70 and 71 are formed by performing a compression process in which a pressure roller forming a convex grid pattern passes through the absorber 6C to compress the compression package chip 68 and the first non-woven fabric sheet 65 toward the front surface of the base material 61. In this case, when forming the SAP layer on the front surface of the base material 61, there is a risk that the SAP may damage the package chip or the non-woven fabric sheet when applying the compression process from the front surface side of the absorber 6C. However, in the absorber 6C according to the present embodiment, the amount of SAP in the SAP layers 62L and 62R disposed on the front surface side of the absorber 6C is reduced. Therefore, when applying the compression process, damage to the first non-woven fabric sheet 65 or the first sheet 68a of the package chip 68 by the SAP can be suppressed. In addition, the compression grooves 70 and 71 are also formed on the front surface of the base material 61 in the central portion in the width direction of the base material 61 where the SAP layer is not formed. Since there is no SAP layer when applying the compression process to the central portion in the width direction of the base material 61, the SAP does not damage the first non-woven fabric sheet 65 or the first sheet 68a of the package chip 68. In this way, the absorber 6C according to the present embodiment can improve the yield when performing the compression process.

[0146] <Fourth Embodiment>

[0147] The absorber according to the fourth embodiment of the present invention will be described. An absorber in which SAP particles are fixed to a non-woven fabric base material uses the SAP to absorb and hold liquid. However, since the non-woven fabric base material to which the SAP particles are fixed is a large mass, the diffusion rate of the liquid discharged by the wearer in the planar direction is very low, and the liquid does not diffuse in the planar direction but penetrates into the non-woven fabric base material, or in other words, penetrates in the thickness direction of the non-woven fabric base material. Therefore, there is a risk that the liquid that penetrates into the non-woven fabric may leak from the absorber instead of being absorbed by the SAP particles.

[0148] In view of this, the object of the present embodiment is to provide a technique capable of suppressing liquid leakage.

[0149] In order to solve the above problems, in the present embodiment, a waterproof finish area is provided on the front surface of the base material with the relative position of the urethral orifice, which is opposite to the urethral orifice of the wearer, as the center.

[0150] Specifically, the present embodiment is an absorber, which includes: a base material formed of a nonwoven fabric; and a SAP layer provided on the front and back surfaces of the base material and containing SAP particles that are superabsorbent polymers. Among them, a waterproof finish area is provided on the front surface of the base material, and the waterproof finish area is centered on the relative position of the urethral orifice, which is opposite to the urethral orifice of the wearer.

[0151] It should be noted that the waterproof finish area can be set such that: the waterproof property decreases as the distance from the relative position of the urethral orifice increases.

[0152] In addition, the waterproof finish area and the non-waterproof finish area can be alternately arranged in the longitudinal direction of the base material and are set such that the ratio of the waterproof finish area to the non-waterproof finish area per unit area gradually decreases.

[0153] Furthermore, a groove extending in the longitudinal direction of the base material can be formed on one side of the front surface of the base material at the center portion in the width direction of the base material.

[0154] In addition, the above absorber can include: a first nonwoven fabric sheet arranged to cover the front surface of the base material; and a second nonwoven fabric sheet arranged to cover the back surface of the base material.

[0155] Moreover, the above absorber can include: a wrapper chip covering the outer periphery of the absorbent composite, and the absorbent composite is configured to include a base material, a SAP layer, a first nonwoven fabric sheet, and a second nonwoven fabric sheet.

[0156] In addition, the present embodiment can be an absorbent article for absorbing urine discharged by a wearer, and the absorbent article includes: a liquid-impermeable backsheet; a liquid-permeable topsheet joined to the backsheet; and any one of the above absorbers arranged between the backsheet and the topsheet.

[0157] According to the present embodiment, liquid leakage can be suppressed.

[0158] Figure 19 is a plan view of the absorber according to the fourth embodiment. The absorber 6D is formed in a sheet shape having a rectangular shape in the plan view. Figure 19 Shows a state in which, when the absorber 6D is arranged in an absorbent article such as a diaper and viewed from the front surface side, the absorber 6D is on the side of the skin-opposing surface that is opposite to the skin of the wearer.

[0159] Figure 20 is when along Figure 19Cross-sectional view of the absorber 6D when cut along the A-A cross-section (the cross-section along the width direction of the absorber 6D). The absorber 6D has a uniform cross-section in the entire longitudinal direction. Although in Figure 20 the corresponding components of the absorber 6D are shown to have gaps provided therebetween for ease of understanding, in reality, it is difficult to form gaps between the corresponding components.

[0160] The absorber 6D includes a base material 61. The base material 61 is formed in a rectangular sheet shape. For the base material 61, a large nonwoven fabric with a thickness of about 1 mm to 3 mm and manufactured by an air penetration method or a needling method or the like is used.

[0161] The absorber 6D includes SAP layers, the SAP layers are arranged on the front surface and the back surface of the base material 61, and the SAP layers include SAP (Super Absorbent Polymer) particles which are highly absorbent polymers. In this case, when the absorber 6D is arranged in the absorbent article, the front surface of the base material 61 is arranged on the side of the skin-facing surface, and the back surface of the base material 61 is arranged on the side of the non-skin-facing surface, the side being opposite to the side of the skin-facing surface. The SAP layer 62 is arranged on the front surface of the base material 61, and the SAP layer 63 is arranged on the back surface of the base material 61. The SAP layer 62 is formed by adhering a plurality of SAP particles to the front surface of the base material 61 using an adhesive. In a similar manner, the SAP layer 63 is formed by adhering a plurality of SAP particles to the back surface of the base material 61 using an adhesive. In the SAP layers 62 and 63, the SAP particles are arranged substantially uniformly. The base material 61 holds the SAP layers 62 and 63. The SAP layer 62 is arranged along the entire longitudinal direction on the front surface side of the base material 61. The SAP layer 63 is arranged on substantially the entire area of the back surface of the base material 61. Alternatively, the SAP particles may be included in the gaps in the base material 61.

[0162] SAP absorbs a liquid that is 10 to 100 times its own weight. For example, as the SAP, SAP in a particulate state before absorbing the liquid is used. The SAP layers 62 and 63 absorb and hold the liquid diffused by the base material 61.

[0163] The SAP layer 62 arranged on the front surface of the base material 61 is arranged on both sides in the width direction of the base material 61 along the longitudinal direction of the base material 61. When the absorber 6D is arranged in the absorbent article, a urethral orifice relative position opposite to the urethral orifice of the wearer is arranged in the central portion in the width direction of the base material 61. Therefore, as described above, when the SAP layer 62 is arranged on both sides in the width direction of the base material 61 along the longitudinal direction of the base material 61, the urine discharged by the wearer is more easily absorbed by the SAP layer 62 via the base material 61, and is more easily absorbed by the SAP layer 63 via the base material 61.

[0164] In addition, the absorbent body 6D includes: a first nonwoven fabric sheet 65 disposed to cover the front surface of the base material 61; and a second nonwoven fabric sheet 66 disposed to cover the rear surface of the base material 61. A liquid-permeable nonwoven fabric is used as the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66. For example, an air-laid nonwoven fabric is used as the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66. The first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66 spread the liquid in the width direction and the longitudinal direction of the absorbent body 6D. Therefore, the absorbent body 6D prevents the liquid such as urine discharged by the wearer from accumulating at the center in the width direction or the center in the longitudinal direction of the absorbent body 6D. In addition, the provision of the first nonwoven fabric sheet 65 improves the wearability of the absorbent article for the wearer.

[0165] In addition, in the absorbent body 6D, a groove can be formed in the base material 61. Figure 21 is similar to Figure 20 FIG. is a cross-sectional view of the absorbent body 6D similar to the one shown. A groove 67 extending in the longitudinal direction of the base material 61 is formed on one side of the front surface of the base material 61 at the center portion in the width direction of the base material 61. When the absorbent body 6D is disposed in the absorbent article, the groove 67 is formed at the position opposite to the urethral orifice so that the urine discharged by the wearer easily flows into the groove 67. The groove 67 is formed after the formation of the base material 61 by applying pressure from the side of the front surface of the base material 61 to the groove-forming region. Alternatively, when manufacturing the base material 61, the groove 67 can be formed by reducing the basis weight of the nonwoven fabric in the groove-forming region.

[0166] The groove 67 immediately guides the liquid discharged from the urethral orifice of the wearer to the outside of the position opposite to the urethral orifice and spreads the liquid into the base material 61 in the region other than the position opposite to the urethral orifice. Therefore, the absorbent body 6D can suppress side leakage, in which the liquid leaks from one side of the side surface of the base material 61.

[0167] In the present embodiment, a waterproof finish is applied to the front surface of the base material 61 in order to spread the urine discharged by the wearer over the entire base material 61. The waterproof finish means applying a treatment that repels the liquid on the front surface of the base material 61, and in the portion where the treatment is applied, it is less likely for the liquid to flow into the base material 61 from the front surface of the base material 61.

[0168] Figure 22 is a view showing a first example of the portion having the waterproof finish. In Figure 22 , the portion surrounded by the dashed line indicates the position opposite to the urethral orifice. In the present embodiment, since the waterproof finish is applied to the front surface of the base material 61 with the position opposite to the urethral orifice as the application center, the waterproof property is the highest near the position opposite to the urethral orifice, and the waterproof property gradually decreases as the distance from the position opposite to the urethral orifice increases. In other words, in the present embodiment, for example, as Figure 22As shown by the shading in [the figure], a maximum waterproof finish area 69 is provided at a position corresponding to the urethral orifice, and non-waterproof finish areas where the waterproof finish is not applied and the waterproof finish area 69 are alternately provided such that the area of the waterproof finish area 69 per unit area gradually decreases as it gets farther from the position corresponding to the urethral orifice. Thus, in Figure 22 the example shown, the waterproof finish area 69 can be described as being formed to trace a stripe pattern in the longitudinal direction of the substrate 61. It should be noted that the waterproof finish centered on the position corresponding to the urethral orifice is not the concept of a waterproof finish (where the position corresponding to the urethral orifice is the exact center position and the waterproofness precisely decreases from the center position), but rather includes the concept of a waterproof finish (where the waterproofness is slightly higher near the position corresponding to the urethral orifice than at other positions).

[0169] Only the required waterproof finish is applied so that the urine discharged by the wearer spreads over the entire substrate 61, and is not limited to the waterproof finish area 69 having a stripe pattern as shown in Figure 22 the figure. For example, the waterproof finish can be applied continuously in the longitudinal direction of the substrate 61 such that: the waterproofness is highest near the position corresponding to the urethral orifice and gradually decreases as the distance from near the position corresponding to the urethral orifice increases, or when the distance from the position corresponding to the urethral orifice increases, the size of the non-waterproof areas scattered in the area where the waterproof finish is applied gradually increases. Figure 23 is a diagram showing a second example of the part having a waterproof finish. For example, as shown in Figure 23 the figure, the waterproof finish can be applied in the longitudinal direction of the substrate 61, and non-waterproof areas can be provided in a dot pattern within the waterproof finish area 69.

[0170] For example, the waterproof finish can be achieved by applying a physical treatment (such as heat treatment or pressure treatment) or a chemical treatment (such as applying waterproof ink) to the front surface of the substrate.

[0171] Figure 24 is a cross-sectional view of the absorbent body 6D when cut along the B-B cross-section (a cross-section along the longitudinal direction of the absorbent body 6D) shown in Figure 19 the figure. In Figure 24 the figure, the blank arrows indicate how the moisture discharged from the urethral orifice flows. In this embodiment, since the waterproof finish for spreading the urine discharged by the wearer over the entire substrate 61 is applied to the front surface of the substrate 61, as shown in Figure 24As indicated by the white arrow in the figure, the liquid discharged from the urethral orifice of the wearer does not spread to the base material 61 near the relative position of the urethral orifice, but is guided to a position on the front surface of the base material 61 at a certain distance from the relative position of the urethral orifice, and the liquid spreads to the entire base material 61 in the non-waterproof area. In addition, the liquid that spreads from the front surface of the base material 61 to the entire base material 61 through the non-waterproof area is absorbed by the SAP layer 62 provided on the front surface of the base material 61 or the SAP layer 63 provided on the rear surface of the base material 61. Therefore, the absorber 6D can suppress side leakage, where the liquid leaks from one side of the side surface of the base material 61.

[0172] In the absorber 6D, the entire absorbent composite configured to include the base material 61, the SAP layers 62 and 63, and the first non-woven fabric sheet 65 and the second non-woven fabric sheet is wrapped by the wrapper chip. Figure 25 is similar to Figure 20 FIG. is a cross-sectional view of the absorber 6D similar to the absorber shown. As Figure 25 shown, the wrapper chip 68 includes: a first sheet 68A that covers the first non-woven fabric sheet 65; and a second sheet 68B that covers the end portion in the width direction of the first non-woven fabric sheet 65, the side surface of the base material 61, and one side of the second non-woven fabric sheet 66. The first sheet 68A and the second sheet 68B are joined and integrally wrap the entire absorbent composite. For example, a liquid-permeable thin paper such as a tissue paper or a non-woven fabric is used as the wrapper chip 68. The wrapper chip 68 can spread the liquid discharged by the wearer over the entire absorber 6D. Alternatively, the wrapper chip 68 may be composed of a single sheet.

[0173] <Fifth Embodiment>

[0174] The absorber according to the fifth embodiment of the present invention will be described. In this absorber, from the perspective of suppressing liquid reflux, it is preferable to hold the liquid at a position as far as possible from the skin of the wearer. However, in an absorber in which SAP particles are fixed to a non-woven fabric base material, since the SAP particles are only arranged on the rear surface side of the base material (at a certain distance from the skin of the wearer), the liquid absorption amount is reduced. For an absorber with a reduced liquid absorption amount, there is a risk of liquid leakage.

[0175] In view of this, the object of this embodiment is to provide a technique capable of suppressing liquid leakage and reflux.

[0176] To solve the above problems, in this embodiment, the liquid absorption speed of the upper SAP layer is increased, and the liquid absorption rate of the lower SAP layer is increased.

[0177] Specifically, this embodiment is an absorber, which includes: a base material formed of a nonwoven fabric and permeable to liquid; an upper SAP layer disposed on the front surface of the base material and containing SAP particles that are superabsorbent polymers; and a lower SAP layer disposed on the rear surface of the base material and containing SAP particles that are superabsorbent polymers, wherein the liquid absorption rate of the upper SAP layer measured by the eddy current method is 45 (seconds) or less, and the liquid absorption rate of the lower SAP layer is 35 (g / g) or more.

[0178] In the above absorber, the upper SAP layer may be disposed on both sides in the width direction of the base material along the central portion in the width direction and may extend in the longitudinal direction of the base material.

[0179] In the above absorber, grooves may be formed on the front surface side of the base material at the central portion in the width direction and along the upper SAP layer on both sides.

[0180] The above absorber may include: a first nonwoven fabric sheet disposed to cover the front surface of the base material; and a second nonwoven fabric sheet disposed to cover the rear surface of the base material.

[0181] The above absorber may include: a package chip covering the outer periphery of the absorbent composite, and the absorbent composite is configured to include a base material, an upper SAP layer, a lower SAP layer, a first nonwoven fabric sheet, and a second nonwoven fabric sheet.

[0182] In addition, an absorbent article may be provided, which absorbs liquid discharged by a wearer and includes: a liquid-impermeable backsheet; a liquid-permeable topsheet bonded to the backsheet; and the above absorber disposed between the backsheet and the topsheet.

[0183] According to this embodiment, liquid leakage and backflow can be suppressed.

[0184] Figure 26 It is a plan view of an absorber according to the fifth embodiment. The absorber 6E is formed in a sheet shape having a rectangular shape in the plan view. Figure 26 A state is shown in which, when the absorber 6E is disposed in an absorbent article such as a diaper, viewed from the front surface side, the absorber 6E is on the side of the skin-opposing surface that is opposite to the skin of the wearer.

[0185] Figure 27 It is when along Figure 26 The cross-sectional view of the absorber 6E when cut along the A-A cross-section shown (the cross-section along the width direction of the absorber 6E). The absorber 6E has a uniform cross-section throughout the longitudinal direction. Although gaps are shown to be provided between the corresponding components of the absorber 6E in Figure 27 for ease of understanding, in reality, it is difficult to form gaps between the corresponding components.

[0186] The absorber 6E includes a base material 61. The base material 61 is formed in a rectangular sheet shape. For the base material 61, a large non-woven fabric with a thickness of about 1 mm to 10 mm and manufactured by an air-through method or a needle-punching method, etc. is used. The base material 61 penetrates and diffuses liquids.

[0187] The absorber 6E includes SAP layers 62L and 62R (examples of "upper SAP layers"), the SAP layers 62L and 62R are arranged on the front surface of the base material 61, and the SAP layers 62L and 62R include SAP (Super Absorbent Polymer) particles which are highly absorbent polymers. In this case, when the absorber 6E is arranged in an absorbent article, the front surface of the base material 61 is arranged on the side of the skin-facing surface, and the rear surface of the base material 61 is arranged on the side of the non-skin-facing surface, the side being opposite to the side of the skin-facing surface. The central portions of the SAP layers 62L and 62R in the width direction are arranged on the front surface of the base material 61 on both sides in the width direction of the base material 61, and extend in the longitudinal direction of the base material 61. It should be noted that the longitudinal direction of the base material 61 is perpendicular to the width direction of the base material 61.

[0188] When the absorber 6E is arranged in an absorbent article, the SAP layer 62L is located on the left side of the wearer of the absorbent article, and the SAP layer 62R is located on the right side of the wearer of the absorbent article. The SAP layers 62L and 62R are formed by adhering a plurality of SAP particles to the front surface of the base material 61 using an adhesive. In the SAP layers 62L and 62R, the SAP particles are arranged substantially uniformly. The base material 61 holds the SAP layers 62L and 62R. The SAP layers 62L and 62R extend along the entire longitudinal direction of the base material 61.

[0189] In addition, the absorber 6E includes: an SAP layer 63 (an example of "lower SAP layer"), which is arranged on the rear surface of the base material 61 and includes SAP particles. The SAP layer 63 is formed on substantially the entire area of the rear surface of the base material 61. The SAP layer 63 is formed by adhering a plurality of SAP particles to the front surface of the base material 61 using an adhesive. In the SAP layer 63, the SAP particles are arranged substantially uniformly. The base material 61 holds the SAP layer 63. By providing the SAP layer 63, the absorber 6E as a whole increases the liquid absorption amount and retention amount. Alternatively, the SAP particles may be included in the gaps in the base material 61.

[0190] The SAP absorbs liquids that are 10 to 100 times its own weight. For example, as the SAP, SAP in a particulate state before absorbing the liquid is used.

[0191] The SAP layers 62L and 62R have a higher liquid absorption rate than the SAP layer 63, but the SAP layer 63 has a higher liquid absorption capacity than the SAP layers 62L and 62R. These properties can be set according to the type of SAP arranged in each SAP layer.

[0192] First, the method for measuring the liquid absorption rate will be described. The liquid absorption rate of SAP can be measured according to the eddy current method. First, 50.0 ml (±0.5 ml) of a physiological saline solution with a concentration of 0.900% (±0.009%) and a temperature of 25°C (±2°C) is poured into a 100 ml volumetric beaker. Next, the beaker is placed on a magnetic stirrer, and a stirring rod is placed inside the beaker. Next, the stirring rod rotates at 600 rpm (±30 rpm) to confirm that the physiological saline solution inside the beaker forms an eddy current in a stable manner. Next, at the moment of adding 2.00 g (±0.02 g) of SAP to the beaker, a stopwatch is used to start the measurement, and the time until the eddy current disappears and the liquid level becomes flat is measured.

[0193] The liquid absorption rate of SAP can be obtained according to the above eddy current method. In the SAP layers 62L and 62R, SAP with a liquid absorption rate measured by the eddy current method of 45 (seconds) or less is used. Therefore, the liquid absorption rate of the SAP layers 62L and 62R measured by the eddy current method is 45 (seconds) or less. It should be noted that the liquid absorption rate of the SAP layer 63 measured by the eddy current method is higher than 45 (seconds).

[0194] Next, the method for measuring the liquid absorption capacity (liquid absorption amount) will be described. The liquid absorption capacity is defined as the amount of liquid absorbed per 1 g of SAP (g). First, a nylon sheet with a mesh size of 57 μm is cut into a size with a longitudinal dimension of 10 cm and a transverse dimension of 40 cm. The cut nylon sheet is folded in half in the longitudinal direction, and both ends are heat-sealed to form a nylon bag in the shape of a 10 cm × 20 cm bag. 1.00 g (±0.01 g) of SAP is placed in the nylon bag. Next, the nylon bag is placed in a physiological saline solution with a concentration of 0.900% (±0.009%) and a temperature of 25°C (±2°C) and soaked for 1 hour. Next, the nylon bag is taken out and drained for 15 minutes. Next, dehydration is performed for 90 seconds using a centrifugal dehydrator with a centrifugal force set to 150 G, and the weight (A) of the nylon bag is measured. In addition, a similar nylon bag without SAP is generated to perform a similar test, and the weight (B) of the nylon bag is measured.

[0195] The liquid absorption capacity of SAP is obtained by substituting the A and B values obtained from the above test into the following equation (4).

[0196] Liquid absorption capacity (g / g) = (A - B) / amount of SAP collected...(4)

[0197] Use a SAP with a liquid absorption rate of 35 (g / g) or higher in the SAP layer 63. Thus, the SAP layer 63 has a liquid absorption rate of 35 (g / g) or higher. It should be noted that the liquid absorption rates of the SAP layers 62L and 62R are both lower than 35 (g / g).

[0198] When the absorber 6E according to this embodiment is disposed in an absorbent article, the SAP layers 62L and 62R are located on the side of the skin-facing surface, and the SAP layer 63 is located on the side of the non-skin-facing surface. In other words, the SAP layer 63 is disposed further away from the wearer's skin than the SAP layers 62L and 62R. Additionally, in the absorber 6E, the SAP layers 62L and 62R have a liquid absorption speed of 45 seconds or less. Thus, the absorber 6E can quickly absorb urine and inhibit urine leakage by using the SAP layers 62L and 62R disposed closer to the wearer's skin and having a relatively high liquid absorption speed. Additionally, in the absorber 6E, the SAP layer 63 has a liquid absorption rate of 35 (g / g) or higher. Since the absorber 6E according to this embodiment uses the SAP layer 63 disposed at a certain distance from the wearer's skin to hold a relatively large amount of urine, a wet feeling on the skin surface can be inhibited and a decline in wearability can be prevented. Additionally, in the absorber, when pressure is applied to the absorber due to body weight or the like, holding the liquid at a position as far as possible can effectively inhibit liquid backflow. Since the absorber 6E according to this embodiment uses the SAP layer 63 disposed at a certain distance from the wearer's skin to hold a relatively large amount of urine, liquid backflow can be inhibited.

[0199] Furthermore, generally, when the wearer assumes a sleeping position while wearing an absorbent article, urine flows on the diaper surface during urination, and the urine causes leakage. On the other hand, by disposing the SAP layers 62L and 62R having a high liquid absorption speed on the side of the skin-facing surface, the absorber 6E according to this embodiment can absorb the urine flowing on the front surface of the absorber 6E with the SAP layers 62L and 62R and prevent urine leakage.

[0200] Additionally, on the front surface side (the side of the skin-facing surface) of the base material 61, SAP is not provided in the central portion in the width direction, but the SAP layers 62L and 62R are disposed on both sides in the width direction. When the absorber 6E is disposed in an absorbent article, the central portion in the width direction on the front surface side of the base material 61 is disposed at a position opposite to the urethral orifice (hereinafter referred to as the "urethral orifice opposite position"). In the absorber 6E, not providing SAP at the urethral orifice opposite position enables the discharged urine to be introduced into the base material 61 and spread over the entire base material 61. Alternatively, a SAP layer can be formed on the entire front surface side of the base material 61.

[0201] In addition, the absorber 6E includes: a first nonwoven fabric sheet 65 disposed to cover the front surface of the substrate 61; and a second nonwoven fabric sheet 66 disposed to cover the rear surface of the substrate 61. A liquid-permeable nonwoven fabric is used as the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66. For example, an air-laid nonwoven fabric is used as the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66. The first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66 spread liquid in the width direction and the longitudinal direction of the absorber 6E. Accordingly, the absorber 6E prevents liquid such as urine discharged by the wearer from accumulating at the center in the width direction or the center in the longitudinal direction of the absorber 6E. In addition, providing the first nonwoven fabric sheet 65 improves the wearability of the absorbent article for the wearer.

[0202] Furthermore, in the absorber 6E, a groove may be formed in the substrate 61. Figure 28 is similar to Figure 26 a plan view. Figure 29 is a cross-sectional view of the absorber 6E when cut along the B-B cross-section (a cross-section along the width direction of the absorber 6E) shown in Figure 28 . The groove 67 is formed on the front surface side of the substrate 61 along the center portion in the width direction of the substrate 61 between the SAP layers 62L and 62R on both sides. When the absorber 6E is disposed in the absorbent article, the groove 67 is formed at a position opposite the urethral orifice such that urine discharged by the wearer easily flows into the groove 67. The groove 67 is formed after the substrate 61 is formed by applying pressure from the front surface side of the substrate 61 to the groove-forming region. Alternatively, when manufacturing the substrate 61, the groove 67 may be formed by reducing the basis weight of the nonwoven fabric in the groove-forming region.

[0203] In this way, by providing the groove 67 on the front surface side (skin-facing surface side) of the absorber 6E, urine can be spread in the entire longitudinal direction of the substrate 61, and leakage of urine can be suppressed even when a large amount of urine is discharged.

[0204] Furthermore, in the absorber 6E, the entire absorbent composite configured to include the substrate 61, the SAP layers 62L, 62R, and 63, and the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet is covered with the wrapper chip 68. Figure 30 is a cross-sectional view of the absorber 6E similar to the absorber shown in Figure 27 . As shown in Figure 30As shown, the wrapper chip 68 includes one side of the first non-woven fabric sheet 65 and the second sheet 68B. The second sheet 68B covers the end portion in the width direction of the first non-woven fabric sheet 65, the side surface of the base material 61, and one side of the second non-woven fabric sheet 66. The first sheet 68A and the second sheet 68B are joined and integrally wrap the entire absorbent composite. For example, a liquid-permeable thin paper such as a tissue paper or a non-woven fabric is used as the wrapper chip 68. The wrapper chip 68 can diffuse the liquid discharged by the wearer over the entire absorbent body 6E. Alternatively, the wrapper chip 68 may be composed of a single sheet.

[0205] <Sixth Embodiment>

[0206] <Absorbent Article Using an Absorbent Body>

[0207] will be described Figures 31 to 34 as an example of an absorbent article using the above absorbent bodies 6A to 6E. Figure 31 is a perspective view of a tape-type disposable diaper (hereinafter simply referred to as "diaper") 1. The diaper 1 has: a crotch region 1B that covers the genital region of the wearer in a worn state; a front body region 1F that is located on the front side of the crotch region 1B; and a rear body region 1R that is located on the rear side of the crotch region 1B. Tapes 2L and 2R are provided at the edges on the left and right sides of the rear body region 1R, and the tapes can adhere to a front patch 2F provided on the surface of the front body region 1F on the non-wearer side. Therefore, when the tapes 2L and 2R are adhered to the front patch 2F in a state where the front body region 1F is disposed on the abdominal side of the wearer and the rear body region 1R is disposed on the dorsal side of the wearer, the diaper 1 is fixed to the body of the wearer in a state where the diaper 1 surrounds the abdominal circumference and thighs of the wearer.

[0208] In the diaper 1, an absorbent body capable of absorbing and retaining liquid is disposed mainly centered around the vicinity of the crotch region 1B. The absorbent body 6 is used as the absorbent body. Alternatively, the absorbent body 6 may be replaced with any one of the absorbent bodies 6A to 6E according to the above first to fifth embodiments. In addition, in order to suppress the formation of a gap serving as a liquid outflow path between the diaper 1 and the skin of the wearer, the diaper 1 is provided with three-dimensional pleats 3BL and 3BR at the portion surrounding the thighs of the wearer, and a waist pleat 3R at the portion surrounding the abdominal circumference of the wearer. The three-dimensional pleats 3BL and 3BR and the waist pleat 3R are in close contact with the skin of the wearer due to the elastic force of the rubber thread. Therefore, the liquid discharged from the genital region of the wearer hardly leaks from the diaper 1 but is absorbed by the absorbent body of the diaper 1.

[0209] Figure 32 is an exploded perspective view of the diaper 1. In addition, Figure 33It is a cross-sectional view when the crotch region is cut along the width direction of the crotch region 1B. The diaper 1 has a cover sheet 4 that forms an outer surface in the mounted state. The cover sheet 4 is a sheet-like member having an approximately rectangular appearance, and narrowing portions 4KL and 4KR are provided at portions corresponding to the long sides. The narrowing portions 4KL and 4KR are provided at the positions of the wearer's thighs. The cover sheet 4 is provided to strengthen and improve the texture of the back sheet 5, and for example, a non-woven fabric made of a liquid-impermeable thermoplastic resin can be used as its material to suppress leakage of excrement. Examples of the liquid-impermeable thermoplastic resin include polyethylene (PE) and polypropylene (PP).

[0210] In addition, the diaper 1 has a back sheet 5, an absorber 6, and a topsheet 7, which are sequentially laminated on the surface of the cover sheet 4 on the wearer side. The back sheet 5, the absorber 6, and the topsheet 7 are all sheet-like members having an approximately rectangular appearance, and are sequentially laminated on the cover sheet 4 in a state where their longitudinal directions match the longitudinal direction of the cover sheet 4. The back sheet 5 is a sheet formed using a non-woven fabric made of a liquid-impermeable thermoplastic resin as a base material so as to suppress leakage of excrement in a manner similar to the cover sheet 4. In addition, the topsheet 7 is a sheet-like member that is disposed on the skin surface side of the wearer to cover the water-absorbing surface (front surface) of the absorber 6. The topsheet 7 is partially or entirely liquid-permeable. Therefore, in the state of wearing the diaper 1, the liquid discharged by the wearer passes through the topsheet 7 that can come into contact with the wearer's skin and enters the absorber 6 to be absorbed by the absorber 6. For example, a textile, a non-woven fabric, or a porous film can be used as the material of the topsheet 7. In addition, the topsheet 7 may also have hydrophilicity.

[0211] In addition, when the genital area of the wearer is covered by the cover sheet 4 on which the back sheet 5, the absorber 6, and the topsheet 7 are laminated, both ends of the corresponding longitudinal directions of the back sheet 5, the absorber 6, and the topsheet 7 are positioned on the abdominal side and the back side of the wearer. In other words, the genital area of the wearer is covered by the absorber 6 from the abdominal side to the back side of the wearer. Therefore, even when the wearer discharges liquid to the outside of the wearer's body in either a prone position or a supine position, the discharged liquid comes into contact with the absorber 6 via the topsheet 7.

[0212] In addition, the diaper 1 has side sheets 8L and 8R which have an elongated stripe shape and are for forming the three-dimensional pleats 3BL and 3BR described above. The side sheets 8L and 8R are provided in portions of the long sides of the topsheet 7. In a manner similar to the three-dimensional pleats 3BL and 3BR of the diaper 1, the side sheets 8L and 8R are provided with constriction portions 8KL and 8KR at positions of the wearer's thighs. Further, rubber threads 8EL and 8ER are woven into the constriction portions 8KL and 8KR in the longitudinal direction. Therefore, when the diaper 1 assumes a mode of a worn state, or in other words, when the diaper 1 assumes a mode in which the diaper 1 has a U shape in a side view, the constriction portions 8KL and 8KR are pulled out in the longitudinal direction and lifted from the topsheet 7 under the contraction force of the rubber threads 8EL and 8ER, thereby forming three-dimensional pleats that prevent liquid from flowing out.

[0213] In addition, at a position more toward the back side than the end of the absorber 6, a rubber thread 9ER for forming the above-described waist pleat 3R is provided between the backsheet 5 and the topsheet 7. The rubber thread 9ER is provided between the backsheet 5 and the topsheet 7 in an orientation in which the longitudinal direction, which is the extension and contraction direction, matches the left-right direction of the diaper 1. Therefore, when the tapes 2L and 2R provided on the left and right sides of the rubber thread 9ER adhere to the front patch 2F on the wearer's abdomen, the rubber thread 9ER exhibits a contraction force, causes the diaper 1 to closely contact the wearer, and prevents a gap from being formed between the diaper 1 and the wearer's abdominal circumference. It should be noted that rubber threads 9SL and 9SR for preventing a gap from being formed between the diaper 1 and the wearer's abdominal circumference are also provided on both sides of the absorber 6.

[0214] As Figures 1 to 6 shown, the absorber 6A according to the first embodiment described above includes SAP layers 62L and 62R which are arranged on the front surface of the liquid diffusion layer 60 on both sides in the width direction of the center portion of the liquid diffusion layer 60 in the width direction of the diaper 1. The liquid diffusion layer uses a large nonwoven fabric, and the SAP layers 62L and 62R extend in the longitudinal direction of the liquid diffusion layer 60.

[0215] In the diaper 1 configured as described above, when the wearer excretes liquid, the excreted liquid contacts the absorbent body 6 via the topsheet 7. Additionally, as described above, the absorbent body 6 diffuses urine over the entire liquid diffusion layer 60 and causes the SAP layers 62L and 62R to uniformly absorb and retain the urine. The SAP layers 62L and 62R that have absorbed urine and swelled serve as dams. Since the SAP layers 62L and 62R serve as dams, a groove 67 is formed at the center in the width direction of the liquid diffusion layer 60, and the groove extends along the SAP layers 62L and 62R (dams), or in other words, extends in the longitudinal direction of the liquid diffusion layer 60. The groove 67 is formed at a position opposite the urethral orifice so that urine excreted by the wearer easily flows into the groove 67. In the final stage of the current urination or during the next urination, the absorbent body 6 uses the groove 67 to diffuse urine in the longitudinal direction of the liquid diffusion layer 60. Therefore, since the diaper 1 diffuses urine over the entire liquid diffusion layer 60, the absorption rate and diffusion rate can be maintained even during the next and subsequent urinations. In addition, when the wearer of the diaper 1 is male, the groove 67 can be formed at a position opposite the urethral orifice at the tip of the penis, and the urination direction from the urethral orifice can be guided by the groove 67.

[0216] Furthermore, since the diaper 1 uses the liquid diffusion layer 60 to diffuse urine over the entire liquid diffusion layer 60, the SAP layers 62L and 62R can uniformly absorb the urine, and the SAP layers 62L and 62R can swell substantially uniformly. Therefore, the absorbent body 6 can prevent depressions from forming in the dams formed by the SAP layers 62L and 62R when only partial SAP layers 62L and 62R swell to open holes in the dams, prevent urine from leaking out of the holes, and thus inhibit urine leakage. Additionally, the diaper 1 temporarily holds the urine that has diffused over the entire liquid diffusion layer 60 with the liquid diffusion layer 60 and allows the urine to be absorbed and retained by the SAP layers 62L and 62R over time. Therefore, the diaper 1 can uniformly absorb and retain urine with the SAP layers 62L and 62R.

[0217] As Figures 7 to 11 shown, the absorbent body 6B according to the second embodiment described previously includes SAP layers 62L and 62R on the front surface of the base material 61, and the base material uses a large piece of nonwoven fabric.

[0218] In the diaper 1 configured as described above, when the wearer excretes liquid, the excreted liquid contacts the absorbent body 6 via the topsheet 7. Further, as described above, even after absorbing urine multiple times, the absorbent body 6 can ensure the liquid permeability of the SAP layers 62L and 62R, and can suppress urine leakage. The SAP layers 62L and 62R are arranged closer to the wearer's skin so that urine can more easily penetrate into the base material 61 or enter the SAP layer 63. Further, in the absorbent body 6, the SAP layer 63 has a liquid absorption rate of 35 (g / g) or higher. Since the diaper 1 according to the present embodiment holds a relatively large amount of urine with the SAP layer 63 arranged at a certain distance from the wearer's skin, a wet feeling on the skin surface can be suppressed and a decrease in wearability can be prevented. Further, by arranging the SAP layers on the front and back surfaces of the base material 61, the diaper 1 can arrange the amount of SAP required to absorb and hold a predetermined amount of liquid in the distributed material among the SAP layers 62L, 62R, and 63, prevent the SAP density in the SAP layers 62L, 62R, and 63 from becoming too high, and prevent the occurrence of gel blockage. Further, the diaper 1 can prevent the SAP in the SAP layers 62L, 62R, and 63 from becoming a gel, and by preventing a decrease in the liquid absorption / holding amount in the SAP layers 62L, 62R, and 63, the diaper 1 can suppress backflow, in which the initially absorbed liquid flows out to the side of the wearer's skin.

[0219] As Figures 12 to 18 shown, in the absorbent body 6C according to the third embodiment described previously, the SAP layers 62L, 62R, and 63 are arranged on the base material 61, which uses a large piece of nonwoven fabric.

[0220] In the diaper 1 configured as described above, when the wearer discharges liquid, the discharged liquid comes into contact with the absorbent body 6 via the topsheet 7. Further, as described above, by including the SAP layer 63 containing a larger amount of SAP than the SAP layers 62L and 63R, the diaper 1 can suppress leakage of liquid without overall reducing the liquid absorption amount and retention amount. Further, by making the SAP layers 62L and 62R contain a smaller amount of SAP than the SAP layer 63, the diaper 1 can cause the SAP layer 63 at a certain distance from the wearer's skin to absorb and retain a larger amount of liquid than the SAP layer 62 closer to the skin. Therefore, since the diaper 1 retains a relatively large amount of urine with the SAP layer 63 disposed at a certain distance from the wearer's skin, a wet feeling on the skin surface can be suppressed and a decline in wearability can be prevented. Further, by disposing the SAP layers on the front and back surfaces of the base material 61, the diaper 1 can dispose the amount of SAP required to absorb and retain a predetermined amount of liquid in the distributed material between the SAP layers 62L, 62R, and 63, prevent the SAP density in the SAP layers 62L, 62R, and 63 from becoming too high, and prevent the occurrence of gel blockage. Further, the diaper 1 can prevent the SAP in the SAP layers 62L, 62R, and 63 from becoming a gel, and by preventing a decline in the liquid absorption / retention amount in the SAP layers 62L, 62R, and 63, the diaper 1 can suppress backflow, in which the initially absorbed liquid flows out to the side of the wearer's skin.

[0221] Further, the compression grooves 70 and 71 can be formed in the absorbent body 6 in a manner similar to that of the absorbent body 6C. In the diaper 1, the amount of SAP in the SAP layers 62L and 62R disposed on the side of the skin-facing surface of the absorbent body 6 is reduced. Therefore, when the absorbent body 6 is subjected to a compression process, damage to the first nonwoven fabric sheet 65 or the first sheet 68a of the encapsulated chip 68 by the SAP can be suppressed. Further, the compression grooves 70 and 71 are also formed on the front surface of the base material 61 at the center portion in the width direction of the base material 61 where the SAP layer is not formed. Since there is no SAP layer when the compression process is applied to the center portion in the width direction of the base material 61, the SAP does not damage the first nonwoven fabric sheet 65 or the first sheet 68a of the encapsulated chip 68. In this way, the diaper 1 according to the present embodiment can improve the yield when performing the compression process.

[0222] The compression grooves 70 and 71 can be formed by compressing a part of the topsheet 7, the first sheet 68a of the encapsulated chip 68, the first nonwoven fabric sheet 65, and the base material 61. Figure 34 is a cross-sectional view when the crotch region is cut in the width direction of the crotch region 1B in a manner similar to Figure 33 The diaper 1 includes compression grooves 70 and 71 formed by compressing a part of the base material 61 of the absorbent body 6 from the topsheet 7. It should be noted that the formation pattern of the compression grooves 70 and 71 can be similar to Figure 17The example shown. By including compression grooves 70 and 71, the diaper 1 can improve the liquid permeability and liquid diffusivity.

[0223] In the diaper 1 including the absorbent body 6D according to the fourth embodiment described above, when the wearer discharges liquid, the discharged liquid contacts the absorbent body 6D via the topsheet 7. Additionally, as described above, since the waterproof finish is applied to the front surface of the substrate 61, the discharged liquid mainly diffuses over the entire substrate 61 along the longitudinal direction of the substrate 61, and over time, the liquid will be absorbed and retained by the SAP in the SAP layers 62 and 63. Therefore, the diaper 1 can suppress the leakage of liquid.

[0224] As Figures 26 to 30 shown, the absorbent body 6E according to the fifth embodiment described previously includes SAP layers 62L and 62R on the front surface of the substrate 61, and the substrate uses a large nonwoven fabric.

[0225] In the diaper 1 configured as described above, when the wearer discharges liquid, the discharged liquid contacts the absorbent body 6E via the topsheet 7. Additionally, as described above, in the absorbent body 6E, the SAP layers 62L and 62R have a liquid absorption speed of 45 (sec) or lower than that of the SAP layer 63. Therefore, the absorbent body 6E can quickly absorb urine using the SAP layers 62L and 62R that are closer to the wearer's skin and have a relatively high liquid absorption speed and suppress the leakage of urine. Additionally, in the absorbent body 6E, the SAP layer 63 has a liquid absorption rate of 35 (g / g) or higher than that of the SAP layers 62L and 62R. Since the diaper 1 according to the present embodiment retains a relatively large amount of urine with the SAP layer 63 disposed at a certain distance from the wearer's skin, the wet feeling on the skin surface can be suppressed and the deterioration of wearability can be prevented. Additionally, in the absorbent article, even when pressure is applied to the absorbent body due to body weight or the like, it is possible to effectively suppress the liquid backflow by holding the liquid at the farthest possible position. Since the diaper 1 according to the present embodiment retains a relatively large amount of urine with the SAP layer 63 disposed at a certain distance from the wearer's skin, the backflow of liquid can be suppressed.

[0226] Furthermore, generally, when the wearer assumes a sleeping position while wearing an absorbent article such as a diaper, urine flows on the diaper surface during urination, and the urine causes leakage. On the other hand, by disposing the SAP layers 62L and 62R having a high liquid absorption speed on the side opposite to the skin surface, the diaper 1 according to the present embodiment can absorb the urine flowing on the front surface (the front surface of the topsheet 7) of the diaper 1 with the SAP layers 62L and 62R and prevent urine leakage.

[0227] Although the tape type disposable diaper is illustrated in the above embodiment, the absorbents 6A to 6E can also be applied to other types of absorbent articles. Examples of absorbent articles to which the absorbents 6A to 6E can be applied include various types of absorbent articles having wrinkles, such as panties type disposable diapers, urine pads, and light incontinence pads, as well as flat absorbent articles without wrinkles.

[0228] The absorbent according to the above embodiment can be organized as follows.

[0229] (A1)

[0230] An absorbent, comprising:

[0231] A liquid diffusion layer formed of a nonwoven fabric; and

[0232] A SAP layer including SAP particles, the SAP being a superabsorbent polymer, the central portion in the width direction of the SAP layer being disposed on the front surface of the liquid diffusion layer on both sides in the width direction of the liquid diffusion layer and extending in the longitudinal direction of the liquid diffusion layer.

[0233] (A2)

[0234] The absorbent according to A1, wherein

[0235] Grooves are formed on the front surface side of the liquid diffusion layer along both sides of the SAP layer and in the central portion in the width direction.

[0236] (A3)

[0237] The absorbent according to A1 or A2, comprising:

[0238] A first nonwoven fabric sheet disposed to cover the front surface of the liquid diffusion layer; and

[0239] A second nonwoven fabric sheet disposed to cover the rear surface of the liquid diffusion layer.

[0240] (A4)

[0241] The absorbent according to A3, comprising:

[0242] A package chip covering the outer periphery of the absorbent composite configured to include a liquid diffusion layer, a SAP layer, a first nonwoven fabric sheet, and a second nonwoven fabric sheet.

[0243] (A5)

[0244] An absorbent article for absorbing liquid discharged by a wearer, the absorbent article comprising:

[0245] A liquid-impermeable backsheet;

[0246] A liquid-permeable topsheet joined to the backsheet; and

[0247] The absorber according to any one of A1 to A4, which is disposed between the backsheet and the topsheet.

[0248] (B1)

[0249] An absorber, comprising:

[0250] A base material, which is formed of a nonwoven fabric and permeates liquid;

[0251] An upper SAP layer, which is disposed on the front surface of the base material and contains SAP particles, and the SAP is a superabsorbent polymer; and

[0252] A lower SAP layer, which is disposed on the back surface of the base material and contains SAP particles, and the SAP is a superabsorbent polymer, wherein

[0253] The liquid permeability of the upper SAP layer is 30 (ml / min) or higher, and

[0254] The liquid absorption rate of the lower SAP layer is 35 (g / g) or higher.

[0255] (B2)

[0256] The absorber according to B1, wherein

[0257] The central portion of the upper SAP layer in the width direction is disposed on both sides of the base material in the width direction and extends in the longitudinal direction of the base material.

[0258] (B3)

[0259] The absorber according to B2, wherein

[0260] Grooves are formed on the front surface side of the base material at the central portion in the width direction and along the upper SAP layer on both sides.

[0261] (B4)

[0262] The absorber according to any one of B1 to B3, comprising:

[0263] A first nonwoven fabric sheet, which is disposed to cover the front surface of the base material; and

[0264] A second nonwoven fabric sheet, which is disposed to cover the back surface of the base material.

[0265] (B5)

[0266] The absorber according to B4, comprising:

[0267] A package chip, which covers the outer periphery of the absorbent composite, and the absorbent composite is configured to include a liquid diffusion layer, an upper SAP layer, a lower SAP layer, a first nonwoven fabric sheet and a second nonwoven fabric sheet.

[0268] (B6)

[0269] An absorbent article for absorbing liquid discharged by a wearer, the absorbent article comprising:

[0270] A liquid-impermeable backsheet;

[0271] A liquid-permeable topsheet joined to the backsheet; and

[0272] An absorbent body according to any one of B1 to B5, disposed between the backsheet and the topsheet.

[0273] (C1)

[0274] An absorbent body, comprising:

[0275] A base material formed of a nonwoven fabric and permeable to liquid;

[0276] An upper SAP layer disposed on the front surface of the base material and containing SAP particles, the SAP being a superabsorbent polymer; and

[0277] A lower SAP layer disposed on the rear surface of the base material and containing SAP particles, the SAP being a superabsorbent polymer, wherein

[0278] The upper SAP layer has a smaller amount of SAP than the lower SAP layer.

[0279] (C2)

[0280] The absorbent body according to C1, wherein

[0281] The upper SAP layer is disposed on both sides in the width direction of the base material along the central portion in the width direction and extends in the longitudinal direction of the base material, and

[0282] Grooves are formed on the front surface side of the base material along the central portion in the width direction of the upper SAP layer on both sides.

[0283] (C3)

[0284] The absorbent body according to C1 or C2, wherein

[0285] The upper SAP layer has a higher liquid permeability than the lower SAP layer.

[0286] (C4)

[0287] The absorbent body according to any one of C1 to C3, comprising:

[0288] A first nonwoven fabric sheet disposed to cover the front surface of the base material; and

[0289] A second nonwoven fabric sheet disposed to cover the rear surface of the base material.

[0290] (C5)

[0291] The absorber according to C4, comprising:

[0292] A chip package that covers the outer periphery of the absorbent composite, the absorbent composite being configured to include a liquid diffusion layer, an upper SAP layer, a lower SAP layer, a first non-woven fabric sheet, and a second non-woven fabric sheet.

[0293] (C6)

[0294] The absorber according to C5, comprising:

[0295] A compression groove formed by compressing the chip package, the first non-woven fabric sheet, and the substrate.

[0296] (C7)

[0297] An absorbent article that absorbs liquid discharged by a wearer, the absorbent article comprising:

[0298] A liquid-impermeable backsheet;

[0299] A liquid-permeable topsheet that is joined to the backsheet; and

[0300] The absorber according to any one of C1 to C6, which is disposed between the backsheet and the topsheet.

[0301] (C8)

[0302] The absorber according to C7, comprising:

[0303] A compression groove formed by compressing a part of the substrate of the absorber from the topsheet.

[0304] (D1)

[0305] An absorber, comprising:

[0306] A substrate formed of a non-woven fabric; and

[0307] SAP layers disposed on the front surface and the back surface of the substrate and containing SAP particles, the SAP being a superabsorbent polymer; wherein

[0308] A waterproof finish area is provided on the front surface of the substrate centered on the urethral orifice relative position that is opposite to the urethral orifice of the wearer.

[0309] (D2)

[0310] The absorber according to D1, wherein

[0311] The waterproof finish area is provided such that: the waterproof property decreases as the distance from the urethral orifice relative position increases.

[0312] (D3)

[0313] The absorber according to D1 or D2, wherein

[0314] The waterproof facing area and the non-waterproof facing area are alternately arranged in the longitudinal direction of the base material, so that the ratio of the waterproof facing area to the non-waterproof facing area per unit area gradually decreases.

[0315] (D4)

[0316] The absorber according to any one of D1 to D3, wherein:

[0317] A groove extending in the longitudinal direction of the base material is formed on the front surface side of the base material at the central portion in the width direction of the base material.

[0318] (D5)

[0319] The absorber according to any one of D1 to D4, comprising:

[0320] A first non-woven fabric sheet arranged to cover the front surface of the base material; and

[0321] A second non-woven fabric sheet arranged to cover the rear surface of the base material.

[0322] (D6)

[0323] The absorber according to D5, comprising:

[0324] A package chip covering the outer periphery of the absorbent composite, the absorbent composite being configured to include a base material, a SAP layer, a first non-woven fabric sheet, and a second non-woven fabric sheet.

[0325] (D7)

[0326] An absorbent article for absorbing urine discharged by a wearer, the absorbent article comprising:

[0327] A liquid-impermeable back sheet;

[0328] A liquid-permeable top sheet joined to the back sheet; and

[0329] The absorber according to any one of D1 to D6, disposed between the back sheet and the top sheet.

[0330] (E1)

[0331] An absorber, comprising:

[0332] A base material formed of a non-woven fabric and permeable to liquid;

[0333] An upper SAP layer disposed on the front surface of the base material and containing SAP particles, the SAP being a superabsorbent polymer; and

[0334] A lower SAP layer disposed on the rear surface of the substrate and containing SAP particles, the SAP being a superabsorbent polymer, wherein

[0335] The liquid absorption rate of the upper SAP layer measured according to the eddy current method is 45 seconds or less, and

[0336] The liquid absorption rate of the lower SAP layer is 35 g / g or more.

[0337] (E2)

[0338] The absorber according to E1, wherein

[0339] The central portion of the upper SAP layer in the width direction is disposed on both sides in the width direction of the substrate and extends in the longitudinal direction of the substrate.

[0340] (E3)

[0341] The absorber according to E2, wherein

[0342] The grooves are formed on the front surface side of the substrate in the central portion in the width direction and along the upper SAP layer on both sides.

[0343] (E4)

[0344] The absorber according to any one of E1 to E3, comprising:

[0345] A first non-woven fabric sheet disposed to cover the front surface of the substrate; and

[0346] A second non-woven fabric sheet disposed to cover the rear surface of the substrate.

[0347] (E5)

[0348] The absorber according to E4, comprising:

[0349] A wrapping chip covering the outer periphery of the absorbent composite configured to include a liquid diffusion layer, an upper SAP layer, a lower SAP layer, a first non-woven fabric sheet, and a second non-woven fabric sheet.

[0350] (E6)

[0351] An absorbent article for absorbing liquid discharged by a wearer, the absorbent article comprising:

[0352] A liquid-impermeable backsheet;

[0353] A liquid-permeable topsheet joined to the backsheet; and

[0354] The absorber according to any one of E1 to E5, disposed between the backsheet and the topsheet.

[0355] [Description of the reference numerals]

[0356] 1 Diaper (tape-type disposable diaper)

[0357] 1F Front body region

[0358] 1R Rear body region

[0359] 2F Front patch

[0360] 2L Tape

[0361] 2R Tape

[0362] 3BL Three-dimensional pleat

[0363] 3BR Three-dimensional pleat

[0364] 3R Waist pleat

[0365] 4 Cover sheet

[0366] 5 Back sheet

[0367] 6 Absorbent body

[0368] 7 Topsheet

[0369] 8EL Rubber thread

[0370] 8ER Rubber thread

[0371] 8L Side sheet

[0372] 8R Side sheet

[0373] 9ER Rubber thread

[0374] 9SL Rubber thread

[0375] 9SR Rubber thread

[0376] 60 Liquid diffusion layer

[0377] 61 Base material

[0378] 62L SAP layer

[0379] 62R SAP layer

[0380] 62SAP layer

[0381] 63SAP layer

[0382] 65 First non-woven fabric sheet

[0383] 66 Second non-woven fabric sheet

[0384] 67 Groove

[0385] 68 Chip package

[0386] 69 Waterproof finishing area

[0387] 70 Compression groove

[0388] 71 Compression groove

Claims

1. An absorber, comprising: a base material formed of a nonwoven fabric and permeable to liquid; an upper SAP layer disposed on the front surface of the base material and formed of SAP particles, where SAP is a superabsorbent polymer; and a lower SAP layer disposed on the rear surface of the base material and formed of SAP particles, where SAP is a superabsorbent polymer, wherein the liquid permeability of the upper SAP layer is 30 ml / min or higher, the liquid permeability of the lower SAP layer is lower than 30 ml / min, the liquid absorption rate of the upper SAP layer is lower than 35 g / g, the liquid absorption rate of the lower SAP layer is 35 g / g or higher, and in the central portion in the width direction of the base material, the upper SAP layer is disposed on both sides in the width direction of the base material and extends in the longitudinal direction of the base material.

2. The absorber according to claim 1, wherein, On the front surface side of the base material, in the central portion in the width direction, grooves are formed along the upper SAP layer disposed on both sides.

3. The absorber according to claim 1 or 2, comprising: a first nonwoven fabric sheet disposed to cover the front surface of the base material; and a second nonwoven fabric sheet disposed to cover the rear surface of the base material.

4. The absorber according to claim 3, comprising: a package chip covering the outer periphery of the absorbent complex configured to include the base material, the upper SAP layer, the lower SAP layer, the first nonwoven fabric sheet, and the second nonwoven fabric sheet.

5. An absorbent article for absorbing liquid discharged by a wearer, the absorbent article comprising: a liquid-impermeable backsheet; a liquid-permeable topsheet joined to the backsheet; and the absorber according to any one of claims 1 to 4, the absorber being disposed between the backsheet and the topsheet.

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