WO2023282320A1 - 吸収性物品 - Google Patents
吸収性物品 Download PDFInfo
- Publication number
- WO2023282320A1 WO2023282320A1 PCT/JP2022/026950 JP2022026950W WO2023282320A1 WO 2023282320 A1 WO2023282320 A1 WO 2023282320A1 JP 2022026950 W JP2022026950 W JP 2022026950W WO 2023282320 A1 WO2023282320 A1 WO 2023282320A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fibers
- absorbent
- absorbent article
- exterior body
- water
- Prior art date
Links
- 239000002250 absorbent Substances 0.000 title claims abstract description 231
- 230000002745 absorbent Effects 0.000 title claims abstract description 202
- 239000000835 fiber Substances 0.000 claims abstract description 202
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 210000001015 abdomen Anatomy 0.000 claims abstract description 8
- 230000003187 abdominal effect Effects 0.000 claims description 53
- 229920003043 Cellulose fiber Polymers 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 229920000742 Cotton Polymers 0.000 claims description 4
- 229920000433 Lyocell Polymers 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 229920000297 Rayon Polymers 0.000 claims description 3
- 229920006221 acetate fiber Polymers 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 239000002964 rayon Substances 0.000 claims description 3
- 239000004627 regenerated cellulose Substances 0.000 claims description 3
- 229920002994 synthetic fiber Polymers 0.000 claims description 3
- 239000012209 synthetic fiber Substances 0.000 claims description 3
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 2
- 230000001568 sexual effect Effects 0.000 claims 1
- 239000010410 layer Substances 0.000 description 58
- 239000006096 absorbing agent Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 239000012466 permeate Substances 0.000 description 5
- 239000000470 constituent Substances 0.000 description 4
- 239000004744 fabric Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000004750 melt-blown nonwoven Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 210000002700 urine Anatomy 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- SGHZXLIDFTYFHQ-UHFFFAOYSA-L Brilliant Blue Chemical compound [Na+].[Na+].C=1C=C(C(=C2C=CC(C=C2)=[N+](CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C=2C(=CC=CC=2)S([O-])(=O)=O)C=CC=1N(CC)CC1=CC=CC(S([O-])(=O)=O)=C1 SGHZXLIDFTYFHQ-UHFFFAOYSA-L 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 206010021639 Incontinence Diseases 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000029142 excretion Effects 0.000 description 1
- 235000002864 food coloring agent Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 210000004013 groin Anatomy 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920006298 saran Polymers 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 210000004243 sweat Anatomy 0.000 description 1
- 238000002076 thermal analysis method Methods 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
Definitions
- the present invention relates to absorbent articles.
- a back sheet is generally arranged on the non-skin facing side of the absorbent body.
- Patent Document 1 describes that a nonwoven fabric including a first fiber layer and a second fiber layer located on one main surface of the first fiber layer is used as a backsheet of an absorbent article.
- Patent Document 2 describes the use of a moisture-permeable, liquid-impermeable sheet as a backsheet.
- the same document also describes disposing an exterior sheet containing cellulosic fibers on the non-skin-facing side of a liquid-impermeable sheet, which is a back sheet, in an absorbent article.
- the cellulosic fibers form a plurality of fiber clumps.
- the present invention includes a ventral exterior body arranged on the ventral side of the wearer when worn, a dorsal exterior body disposed on the dorsal side of the wearer when worn, and the ventral exterior body and the dorsal exterior body.
- the present invention relates to an absorbent article having an absorbent main body that is fixed across the body.
- the absorbent main body comprises an absorbent body, a top sheet arranged on the skin facing side of the absorbent body, a back sheet arranged on the non-skin facing side of the absorbent body, and the back side. It is preferable to have a crotch sheet arranged on the non-skin facing side of the sheet.
- the crotch sheet preferably contains absorbent fibers.
- the ratio of water-absorbing fibers in the fibers constituting the nonwoven fabric constituting the ventral exterior body and the ratio of the water-absorbing fibers in the fibers constituting the nonwoven fabric constituting the dorsal exterior body is higher.
- FIG. 1 is a plan view of a state in which an underpants-type disposable diaper, which is an embodiment of the absorbent article of the present invention, is unfolded and stretched to the maximum, viewed from the side facing the skin.
- FIG. 2 is a sectional view taken along line II--II of FIG.
- FIG. 3 is a cross-sectional view schematically showing a III-III cross section (a cross section along the thickness direction and the lateral direction) of the diaper shown in FIG. 1 in its natural state.
- Patent Document 2 a mass of cellulosic fibers arranged on the outer surface of a moisture-permeable sheet absorbs and retains moisture that is about to permeate the sheet and is released to the outside of the absorbent article.
- a sheet containing water-absorbent fibers such as cellulose fibers
- the fibers continue to retain moisture, causing the wearer to perceive a wet feeling and skin troubles.
- a sheet containing water-absorbent fibers is arranged so as to form the entire outer surface of the absorbent article, there is also a problem that the manufacturing cost rises and is not economical.
- the present invention relates to an absorbent article capable of overcoming the drawbacks of the prior art described above.
- FIG. 1 shows an underpants-type disposable diaper (hereinafter also simply referred to as "diaper") 1, which is an embodiment of the absorbent article of the present invention.
- the diaper 1 has an abdominal portion A arranged on the abdomen side of the wearer, a dorsal portion B arranged on the dorsal side of the wearer, and an abdominal portion A and a dorsal portion B. It has a crotch part C located between them.
- the diaper 1 has a longitudinal direction X corresponding to the direction extending from the abdominal part A to the dorsal part B via the crotch part C, and a lateral direction Y perpendicular to the longitudinal direction X.
- FIG. 1 shows an underpants-type disposable diaper (hereinafter also simply referred to as "diaper") 1, which is an embodiment of the absorbent article of the present invention.
- the diaper 1 has an abdominal portion A arranged on the abdomen side of the wearer, a dorsal portion B arranged on the do
- the diaper 1 comprises an absorbent main body 2 and an exterior body arranged on the non-skin facing side of the absorbent main body 2 .
- the exterior body includes an abdominal exterior body 4A arranged in the ventral part A and a dorsal exterior body 4B arranged in the dorsal part B.
- the ventral exterior body 4A and the dorsal exterior body 4B are independent and separate members.
- the abdominal exterior body 4A mainly forms the front body of the diaper 1.
- the back exterior body 4B mainly forms the back body of the diaper 1.
- the absorbent main body 2 is spanned and fixed between the ventral exterior body 4A and the dorsal exterior body 4B.
- Both the abdominal exterior body 4A and the dorsal exterior body 4B are preferably made of nonwoven fabric.
- the ventral exterior body 4A and the dorsal exterior body 4B are made of non-woven fabric, it is possible to impart breathability to these members.
- sweat can smoothly evaporate from the skin facing the abdominal exterior body 4A and the back exterior body 4B.
- both side portions 4e, 4e along the longitudinal direction X of the abdominal exterior body 4A and both side portions 4f, 4f along the longitudinal direction X of the dorsal exterior body 4B are joined.
- the diaper 1 is formed with a pair of side seal portions (not shown), a waist opening (not shown) and a pair of leg openings (not shown).
- each of the ventral exterior body 4A and the dorsal exterior body 4B includes an outer layer sheet 42, an inner layer sheet 41 disposed on the skin facing side of the outer layer sheet 42, both sheets 41, It has a plurality of elastic members 43 arranged between 42 .
- the elastic member 43 is filamentous and arranged so as to extend along the lateral direction Y of the diaper 1 .
- a plurality of elastic members 43 are arranged at intervals in the longitudinal direction X of the diaper 1 .
- the elastic member 43 arranged at the position overlapping the absorbent main body 2 is finely divided in the region overlapping the absorbent main body 2 in the thickness direction so as not to exhibit elastic stretchability. are distributed.
- the absorbent main body 2 has a shape elongated in the longitudinal direction X of the diaper 1 .
- the absorbent main body 2 includes an absorbent body 23, a surface sheet 21 disposed on the skin facing side of the absorbent body 23, and a back side disposed on the non-skin facing side of the absorbent body 23. It has a sheet 22 and a crotch sheet 3 arranged on the non-skin facing side of the back sheet 22 .
- the absorbent body 23 has a shape elongated in the longitudinal direction X of the diaper 1. As shown in FIG. The absorbent body 23 is interposed between the top sheet 21 and the back sheet 22 . In this embodiment, as shown in FIG.
- elastic members (hereinafter also referred to as “absorber gather forming elastic members”) 24 are arranged on both sides of the absorber 23 in the longitudinal direction X, respectively.
- the absorber gather forming elastic member 24 is arranged along the longitudinal direction X in a stretched state.
- the absorber gather forming elastic member 24 is fixed between the absorber 23 and the topsheet 21 .
- illustration of the absorber gather forming elastic member 24 is omitted in FIG.
- the surface sheet 21 has liquid permeability.
- the surface sheet 21 is generally made of hydrophilic nonwoven fabric.
- the backsheet 22 is liquid-impermeable or liquid-impermeable.
- the backsheet 22 has moisture permeability.
- the backsheet 22 is non-absorbent to moisture.
- the backsheet 22 is generally composed of a porous film or a hydrophobic composite nonwoven fabric obtained by laminating a spunbond nonwoven fabric and a meltblown nonwoven fabric.
- hydrophobic composite nonwoven fabric obtained by laminating a spunbond nonwoven fabric and a meltblown nonwoven fabric.
- hydroophobicity refers to the property of poor compatibility with water, such as a contact angle of 90° or more with respect to water at 25°C.
- the crotch sheet 3 has a shape elongated in the longitudinal direction X of the diaper 1 like the absorbent body 2 .
- the crotch sheet 3 is continuously present in the vertical direction X from the abdomen side exterior body 4A to the back side exterior body 4B.
- the crotch sheet 3 is composed of a single sheet that continuously extends from the abdominal portion A through the crotch portion C to the dorsal portion B.
- An end region of the crotch sheet 3 on the side of the abdominal portion A overlaps the abdominal exterior body 4A in a plan view of the diaper 1 .
- the end region of the crotch sheet 3 on the side of the back side portion B overlaps the back side exterior body 4B in a plan view of the diaper 1 .
- the length of the crotch sheet 3 in the lateral direction Y is the same as the length of the absorbent main body 2 in the lateral direction Y, or is slightly shorter than the length of the absorbent main body 2 in the lateral direction Y as shown in FIG. ing.
- FIG. 1 shows a state in which the absorbent body 2 extends outward in the lateral direction Y from each side edge of the crotch sheet 3 .
- a region 3C between the end region of the crotch sheet 3 on the side of the abdominal portion A and the end region of the side of the dorsal portion B is located in the crotch portion C of the diaper 1 .
- this region 3C is also referred to as "crotch region 3C".
- the crotch sheet 3 forms the outer surface of the diaper 1 in the crotch region 3C.
- the crotch sheet 3 has a fiber sheet containing water absorbent fibers. The water-absorbing fibers are present all over the crotch sheet 3 .
- the crotch sheet 3 is breathable and has moisture permeability.
- the crotch sheet 3 is arranged on the non-skin-facing side of the back sheet 22, and constitutes the outer surface of the diaper 1 in the crotch region 3C.
- the crotch sheet 3 contains absorbent fibers as described above.
- the backsheet 22 has moisture permeability as described above. Therefore, the moisture caused by excrement and the like absorbed by the absorbent body 23 permeates the backsheet 22 and moves to the non-skin facing side of the backsheet 22 . Since the crotch sheet 3 containing water-absorbent fibers is arranged on the non-skin-facing side of the backsheet 22, the water-absorbent fibers can absorb and retain moisture permeating through the backsheet 22. - ⁇ . This effectively prevents the clothes of the wearer of the diaper 1 from getting wet due to moisture permeating the backsheet 22 . As a result, it is possible to prevent the wearer from perceiving wetness.
- the caregiver can easily remove the diaper 1 from the wearer. It is also possible to prevent a person from perceiving a stuffy feeling.
- the back sheet 22 having liquid impermeability or liquid impermeability is arranged on the side of the crotch sheet 3 facing the skin. Since the moisture absorbed and retained by the water-absorbent fibers hardly touches the wearer's skin, the wearer hardly perceives a wet feeling.
- the above advantages are remarkable in the crotch region 3C where the crotch sheet 3 is exposed to the outer surface, in other words, the crotch portion C of the diaper 1 .
- the above-described advantages can be remarkably achieved in the abdomen side portion A and the back side portion B of the diaper 1 as well. This device will be described in detail below.
- the abdominal exterior body 4A and the dorsal exterior body 4B are made of nonwoven fabric.
- the crotch sheet 3 is determined more than the ratio of the water-absorbent fibers in the fibers constituting the nonwoven fabric constituting the abdominal exterior body 4A and the ratio of the water-absorbing fibers in the fibers constituting the nonwoven fabric constituting the back exterior body 4B.
- the proportion of water-absorbent fibers in the constituent fibers is higher. By doing so, it becomes more difficult for the wearer of the diaper 1 to perceive the feeling of wetness.
- the abdominal exterior body 4A and the dorsal exterior body 4B are less likely to get wet due to the moisture permeating the back sheet 22, so that the wearer of the diaper 1 can be prevented from perceiving wetness.
- the back sheet 22 does not exist in the region extending from the back sheet 22 in the plan view of the diaper 1 in the abdominal outer packaging 4A and the back outer packaging 4B, the moisture generated from the absorber 23 does not exist. There is no circulation through the backsheet 22 .
- the manufacturing cost of the diaper 1 can be reduced. Since the moisture that permeates the backsheet 22 is mainly caused by the excrement and the like absorbed and retained by the absorbent body 23, the amount of moisture that permeates through the backsheet 22 is the ventral portion A of the backsheet 22. And the region located in the crotch portion C tends to be larger than the region located in the dorsal portion B.
- the ratio of the water-absorbing fibers in the crotch sheet 3 located in the crotch part C where the amount of moisture permeating the back sheet 22 is relatively large is relatively increased, and the ventral part where the amount of moisture is relatively small is increased.
- the manufacturing cost of the diaper 1 can be reduced.
- the ratio of the water-absorbing fibers in the fibers constituting the crotch sheet 3 and the nonwoven fabric constituting the abdominal exterior body 4A are adjusted.
- the difference from the ratio is each independently preferably 0.5% by mass or more, more preferably 1.0% by mass or more, still more preferably 2.0% by mass or more, and preferably 10% by mass or less, More preferably 5.0% by mass or less, still more preferably 3.0% by mass or less, and preferably 0.5% by mass or more and 10% by mass or less, more preferably 1.0% by mass or more and 5.0% by mass % or less, more preferably 2.0 mass % or more and 3.0 mass % or less.
- the ratio of the water-absorbing fibers in the fibers constituting the nonwoven fabric means the ratio of the water-absorbent fibers in the non-skin-facing side of the nonwoven fabric. It means the ratio of absorbent fibers.
- the ratio of water-absorbent fibers in the fibers constituting the nonwoven fabric is the highest among the nonwoven fabrics. It means the ratio of absorbent fibers in the layer located on the non-skin facing side.
- the ratio of water-absorbing fibers in the fibers constituting the crotch sheet 3 means that the crotch sheet 3 contains water-absorbing fibers and has the highest ratio of water-absorbing fibers. It means the ratio of absorbent fibers in the larger layer.
- the ratio of water-absorbing fibers can be measured by the following method. [Method for measuring the ratio of water-absorbing fibers] Only the absorbent fibers present in the nonwoven fabric to be measured are dyed. A dye prepared in a 0.5% by mass aqueous solution (Aizen Food Color Food Blue No. 1, manufactured by Daiwa Kasei Co., Ltd.) is used for dyeing. A nonwoven fabric is immersed in a dye prepared in a 0.5% by mass aqueous solution, left to stand for 3 minutes, then taken out, placed on paper (Kimtowel, manufactured by Nippon Paper Crecia Co., Ltd.), and a load of 3 kPa is applied from above the nonwoven fabric for 1 minute. to dehydrate.
- a dye prepared in a 0.5% by mass aqueous solution (Aizen Food Color Food Blue No. 1, manufactured by Daiwa Kasei Co., Ltd.) is used for dyeing.
- a nonwoven fabric is immersed in a dye prepared in a 0.5% by mass
- the non-water-absorbing fibers are collected from the region not containing the water-absorbing fibers, and this is used as the non-water-absorbing sample. If the water-absorbing fibers and the non-water-absorbing fibers are uniformly mixed as a whole and no region containing the water-absorbing fibers is found, tweezers or the like are used to take out only the non-water-absorbing fibers.
- the taken-out non-water-absorbing fibers are placed in an electric dryer (for example, manufactured by Isuzu Manufacturing Co., Ltd.) at a temperature of 105 ⁇ 2 ° C. for 1 hour, then the temperature is 20 ⁇ 2 ° C. and the relative humidity is 65 ⁇ 2. % standard environment, with the sample wrapped in Saran Wrap (registered trademark) manufactured by Asahi Kasei Corporation, silica gel (for example, manufactured by Toyoda Kako Co., Ltd.) in a glass desiccator (for example, manufactured by Tech Jam Co., Ltd. ) and allowed to stand until the temperature of the fiber sample reaches 20 ⁇ 2° C., which is used as a non-absorbent sample.
- Saran Wrap registered trademark
- silica gel for example, manufactured by Toyoda Kako Co., Ltd.
- a glass desiccator for example, manufactured by Tech Jam Co., Ltd.
- a non-absorbent sample is finely cut, and thermal analysis is performed using a high-sensitivity differential scanning calorimeter (DSC6200, manufactured by Seiko Instruments Inc.) at a temperature increase rate of 10 ° C./min.
- the melting peak temperature T1 and its peak area S1 are measured. If there are multiple peaks, select the peak with the largest peak area.
- fiber samples taken out from arbitrary 10 points of the nonwoven fabric to be measured are combined into one, and the melting peak temperature and peak area are measured by the method described above, and the non-absorbent sample near the melting peak temperature T1 ( From the peak area S2 of the peak within 3° C.), the ratio C (% by mass) of the water-absorbent fiber is calculated using the following formula.
- C (1-S2/S1) x 100
- the measurement is repeated three times, and the average value is taken as the ratio of water-absorbing fibers.
- the ratio of the water-absorbent fibers in the fibers constituting the crotch sheet 3 is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, and even more preferably 1.0% by mass or more, from the viewpoint of making it difficult to perceive wetness and stuffiness. is 2.0% by mass or more, preferably 5.0% by mass or less, more preferably 4.0% by mass or less, still more preferably 3.0% by mass or less, and preferably 0.5 % by mass or more and 5.0% by mass or less, more preferably 1.0% by mass or more and 4.0% by mass or less, and even more preferably 2.0% by mass or more and 3.0% by mass or less.
- the basis weight of the water-absorbent fibers in the crotch sheet 3 is preferably 0.1 g/m 2 or more, more preferably 0.2 g/m 2 or more, and still more preferably 0.3 g/m 2 or more, preferably 2.0 g/m 2 or less, more preferably 1.0 g/m 2 or less, still more preferably 0.7 g/m 2 or less, and preferably 0.1 g/m 2 or more and 2.0 g/m 2 or less, more preferably 0.2 g/m 2 or more and 1.0 g/m 2 or less, still more preferably 0.3 g/m 2 or more and 0.7 g/m 2 or less is.
- the ratio of the water-absorbing fibers in the fibers forming the nonwoven fabric forming the ventral-side exterior body 4A and the ratio of the water-absorbing fibers in the fibers forming the nonwoven fabric forming the back-side exterior body 4B affect the feeling of wetness and stuffiness.
- the basis weight of the water-absorbing fibers in the non-woven fabrics constituting the ventral exterior body 4A and the dorsal exterior body 4B is preferably 1.0 g/m 2 independently from the viewpoint of making it difficult to perceive the feeling of wetness and stuffiness. Below, more preferably 0.5 g/m 2 or less, still more preferably 0.2 g/m 2 or less.
- the basis weight of the absorbent fibers in the nonwoven fabric may be zero.
- the lower limit of the basis weight of the water-absorbing fibers can be preferably 0.1 g/m 2 .
- the abdominal exterior body 4A and the dorsal exterior body 4B do not contain water-absorbing fibers.
- the amount of moisture absorbed by the abdominal exterior body 4A and the dorsal exterior body 4B, which have portions in direct contact with the wearer's skin of the diaper 1, can be further reduced.
- 4A and the back outer covering 4B can more effectively prevent the wearer of the diaper 1 from feeling wet.
- water-absorbent material is used as a constituent material of the ventral exterior body 4A and the dorsal exterior body 4B. Since it is not necessary to use fibers, the manufacturing cost of the diaper 1 can be further reduced.
- the term "absorbent fiber” refers to a fiber that is absorbent, that is, has the ability to absorb water, and the absorbent fiber can retain the absorbed water. Specifically, the fiber has an official moisture content (the moisture content of the fiber in an environment of temperature 20° C. and humidity 65% RH) of 5% by mass or more.
- the water-absorbent fibers may be fibers that are inherently water-absorbing, or fibers that are inherently non-absorbent and processed to impart water-absorbing properties.
- the basis weight of the absorbent fibers in the crotch sheet 3 may be approximately the same at any position of the crotch sheet 3 .
- the water-absorbing fibers may be unevenly distributed in a specific region in the plan view of the crotch sheet 3 .
- the crotch sheet 3 may have a single-layer structure, or may have a multi-layer structure of two or more layers.
- the water-absorbing fibers are preferably contained in layers other than the layer located closest to the non-skin facing side of the crotch sheet 3 . This point will be described with reference to FIG.
- the crotch sheet 3 has a three-layer structure.
- the three layers of the crotch sheet 3 are defined as a first layer 31, a second layer 32 and a third layer 33 in order from the skin facing side to the non-skin facing side.
- the absorbent fibers are preferably contained in at least one layer of the first layer 31 and the second layer 32 other than the third layer 33 .
- Both the first layer 31 and the second layer 32 may contain absorbent fibers.
- only the first layer 31 may contain absorbent fibers. Since the water-absorbing fibers are contained in layers other than the third layer 33 located on the side closest to the non-skin-facing side, moisture permeating through the backsheet 22 is absorbed by the skin-facing side of the crotch sheet 3 relatively.
- the length L1 of the crotch sheet 3 and the length L2 of the backsheet 22 may be the same or different.
- the length L1 of the crotch sheet 3 and the length L2 of the back sheet 22 are different, the length L1 of the crotch sheet 3 is preferably shorter than the length L2 of the back sheet 22 as shown in FIG.
- a relatively large amount of water-absorbent fibers can be present in the crotch portion C, where a relatively large amount of moisture permeates through the backsheet 22, so that the feeling of wetness and stuffiness can be perceived more efficiently. can be made difficult.
- the ratio (L1/L2) of the length L1 of the crotch sheet 3 to the length L2 of the back sheet 22 is preferably 0.2 or more, more preferably 0.2 or more, from the viewpoint of more efficiently making it difficult to perceive wetness and stuffiness. is 0.3 or more, more preferably 0.4 or more, preferably 1.0 or less, more preferably 0.8 or less, still more preferably 0.6 or less, and preferably 0.2 or more It is 1.0 or less, more preferably 0.3 or more and 0.8 or less, and still more preferably 0.4 or more and 0.6 or less.
- the absorbent main body 2 has a first leak-preventing cuff 5 and a second leak-preventing cuff 6 on each side in the longitudinal direction X of the diaper 1, as shown in FIG.
- the first leak-proof cuff 5 has a fixed end portion 5a fixed to another member at one end side in the horizontal direction Y.
- the other end of the first leak-preventing cuff 5 in the horizontal direction Y is a free end 5b that is not fixed to another member.
- the first leak-preventing cuff 5 has a plurality of elastic members (hereinafter also referred to as “first leak-preventing cuff-forming elastic members”) 53 at positions near the free end of the first leak-preventing cuff 5 . .
- the first leakage-preventing cuff forming elastic member 53 is arranged along the longitudinal direction X in a stretched state.
- the free end 5b side of the first leak-preventing cuff 5 rises from the fixed end 5a at least at the crotch portion C due to the contractile force of the first leak-preventing cuff-forming elastic member 53. Stand on the wearer's side as As a result, excretion such as urine is prevented from flowing out in the lateral direction Y.
- the upright portion of the first leak-proof cuff 5 is bent at the bent portion 5c as shown in FIG.
- the bent portion 5c extends along the vertical direction X.
- the standing portions of the first leak-proof cuff 5 are a first standing portion 51 extending from the fixed end portion 5a to the bent portion 5c, and a free end portion 5b extending from the bent portion 5c, and are closer to the wearer's skin than the first standing portion 51. and a second standing portion 52 located on the side. That is, in the erected state of the standing portions, the first standing portion 51 is positioned on the fixed end portion 5a side and the second standing portion 52 is positioned on the free end portion 5b side.
- the second standing portion 52 is a belt-like portion on the free end side of the first leak-proof cuff 5, and the skin-facing surface of the second standing portion 52 can come into contact with the wearer's skin (groin) when worn.
- the first standing portion 51 is a portion connected to the second standing portion 52 via the bent portion 5c, and is a standing portion that rises toward the skin-facing surface from the fixed end portion 5a.
- the second leak-proof cuff 6 has a fixed end 6a fixed to another member at one end in the horizontal direction Y.
- the other end of the second leak-preventing cuff 6 in the horizontal direction Y is a free end 6b that is not fixed to another member.
- the free ends of the second leak-preventing cuffs 6 are positioned further outward in the lateral direction Y of the diaper 1 than the free ends of the first leak-preventing cuffs 5 are.
- the free ends of the second leak-preventing cuffs 6 are positioned further outward in the lateral direction Y of the diaper 1 than the free ends of the first leak-preventing cuffs 5 are. preferably located.
- the second leak-preventing cuff 6 has a plurality of elastic members (hereinafter also referred to as “second leak-preventing cuff-forming elastic members”) 63 at positions near the free end of the second leak-preventing cuff 6 . .
- the second leak-proof cuff-forming elastic member 63 is arranged along the longitudinal direction X in a stretched state.
- the free end 6b side of the second leak-preventing cuff 6 rises from the fixed end 6a at least at the crotch portion C due to the contractile force of the second leak-preventing cuff-forming elastic member 63.
- Stand on the wearer's side as As a result the outflow of excrement such as urine to the outside in the lateral direction Y is more effectively prevented.
- the side edges 3e, 3e of the crotch sheet 3 in the longitudinal direction X of the diaper 1 may or may not reach the side edges 2e, 2e of the absorbent main body 2, but they do not reach them. is preferred. Since the side edges 3e, 3e of the crotch sheet 3 do not reach the side edges 2e, 2e of the absorbent main body 2, the side edges 3e of the crotch sheet 3 rub against the wearer's clothes, etc. It is possible to prevent a part of the water-absorbing fibers from coming off and adhering to the skin. As described above, since the crotch sheet 3 can retain moisture by the water-absorbing fibers of the sheet 3, the crotch sheet 3 may get wet while the diaper 1 is being worn. .
- the side edges 3e, 3e of the crotch sheet 3 do not reach the side edges 2e, 2e of the absorbent main body 2, the side edges 3e of the crotch sheet 3 rub against the wearer's clothes, etc. Since it is possible to prevent part of the water-absorbing fibers from coming off and adhering to the skin, it is possible to prevent the above-mentioned adverse effects from occurring.
- the side edges 2 e , 2 e of the absorbent main body 2 in the longitudinal direction X are the side edges of the second leak-proof cuff 6 . It is preferable that the side edges 3e, 3e of the crotch sheet 3 do not reach the side edges 2e, 2e of the absorbent main body 2 at least in the natural state of the diaper 1 .
- the side edges 3e, 3e of the crotch sheet 3 do not reach the second leak-proof cuff-forming elastic member 63.
- the crotch sheet 3 does not overlap the second leak-proof cuff-forming elastic members 63 in a plan view of the diaper 1 . Since the second leak-preventing cuff 6 stands up on the side facing the skin due to the contraction of the second leak-preventing cuff-forming elastic member 63, the second leak-preventing cuff-forming elastic member 63 in the second leak-preventing cuff 6 is arranged. The part that is covered may be in close contact with the wearer's skin.
- the second leak-proof cuffs 6 which are the portions that come into close contact with the skin of the wearer, are formed.
- the crotch sheet 3 can be kept away from the portion where the cuff-forming elastic member 63 is arranged.
- the moisture absorbed and held by the crotch sheet 3 can be prevented from moving to the portion of the second leak-proof cuff 6 that is in close contact with the wearer's skin, thereby preventing the wearer from perceiving wetness. This can be further prevented.
- the side edges 3e of the crotch sheet 3 rub against the wearer's clothes, etc. It is also possible to effectively prevent the water-absorbent fibers from coming off and adhering to the skin. At least in the natural state of the diaper 1, it is preferable that the side edges 3e, 3e of the crotch sheet 3 do not reach the second leak-proof cuff-forming elastic member 63. As shown in FIG.
- the elastic member 63 positioned furthest outward in the horizontal direction Y among the plurality of elastic members 63 does not overlap. More preferably, it does not overlap with the elastic member 63 positioned furthest inward in the horizontal direction Y.
- the crotch sheet 3 may or may not overlap the first leak-proof cuff-forming elastic member 53 in a plan view of the diaper 1 .
- the crotch sheet 3 may or may not overlap the absorber gather forming elastic member 24 in the plan view of the diaper 1 .
- the positions of the side edges 3e, 3e of the crotch sheet 3 in the longitudinal direction of the diaper 1 may or may not match the positions of the side edges 23e, 23e of the absorber 23. As shown in FIG. If the positions of the side edges 3e of the crotch sheet 3 and the positions of the side edges 23e of the absorbent body 23 do not match, which of the side edges 3e of the crotch sheet 3 and the side edges 23e of the absorbent body 23 is located laterally? It may be positioned outward in the direction Y.
- the positions of the side edges 3e, 3e of the crotch sheet 3 in the longitudinal direction X of the diaper 1 correspond to the position of the absorbent body 23. preferably coincide with the positions of the side edges 23e, 23e of the .
- the abdominal exterior body 4A and the back exterior body 4B have regions that overlap the crotch sheet 3 (hereinafter also referred to as "overlapping regions"). It is preferable that an aperture be arranged in the overlapping region. This opening may be arranged in both or only one of the overlapping region Ra of the ventral exterior body 4A and the overlapping region Rb of the dorsal exterior body 4B. When openings are provided in the overlapping regions Ra and Rb of the abdominal exterior body 4A or the dorsal exterior body 4B, the openings may be disposed on both the skin-facing surface side and the non-skin-facing surface side. Alternatively, it may be arranged only on one side.
- holes may be provided in both the outer layer sheet 42 and the inner layer sheet 41 of the ventral outer package 4A or the dorsal outer package 4B, or only one of the sheets may be provided with holes. may be distributed. It is preferable that a plurality of openings are arranged. In this embodiment, a plurality of openings penetrating through the ventral exterior body 4A or the dorsal exterior body 4B are arranged in the overlap region. Specifically, a plurality of openings penetrating the abdominal exterior body 4A are arranged in the overlapping region Ra of the abdominal exterior body 4A, and the openings penetrate the abdominal exterior body 4A. is preferable. A plurality of openings penetrating through the back exterior body 4B are arranged in the overlapping region Rb of the back exterior body 4B.
- the openings are preferably arranged only on the non-skin-facing side of the abdominal exterior body 4A or the dorsal exterior body 4B. More preferably, it is arranged on both the surface side and the non-skin facing surface side.
- the method of forming the openings in the abdominal exterior body 4A or the dorsal exterior body 4B is not particularly limited.
- 4A or the back exterior body 4B may be formed, or a sheet having no apertures may be used as the outer layer sheet 42 or the inner layer sheet 41, and an elastic member 43 may be provided between the outer layer sheet 42 and the inner layer sheet 41.
- the openings may be formed after forming the abdominal exterior body 4A or the dorsal exterior body 4B arranged in an extended state.
- the elastic member 43 arranged at the position overlapping the absorbent main body 2 is designed not to exhibit elastic stretchability.
- the opening may be formed in the ventral armor 4A or the dorsal armor 4B by pressing a cutting blade from the outside of the ventral armor 4A or the dorsal armor 4B.
- an elastic member cutting means is used to cut the elastic member.
- the elastic member 43 By pressing a cutting blade from the outside of the abdominal exterior body 4A or from the outside of the dorsal exterior body 4B corresponding to the position where the absorbent main body 2 is arranged, the elastic member 43 is pressed and the contraction function is exhibited.
- the openings may be formed while dividing into a plurality of pieces so as not to be broken.
- the elastic member cutting means include an elastic member cutting portion used in the method for manufacturing a composite stretchable member described in Japanese Patent Application Laid-Open No. 2002-253605.
- Both the abdominal exterior body 4A and the dorsal exterior body 4B may have overlapping regions, or only one of them may have an overlapping region.
- the openings may be arranged in the respective overlapping regions of the ventral exterior body 4A and the dorsal exterior body 4B.
- the openings may be provided in only one of the overlapping region of the ventral exterior body 4A and the overlapping region of the dorsal exterior body 4B. It is preferable that a plurality of the openings are arranged.
- nonwoven fabrics produced by various methods can be used, and examples thereof include air-through nonwoven fabrics, spunbond nonwoven fabrics, spunlace nonwoven fabrics, air-laid nonwoven fabrics, resin-bond nonwoven fabrics, and meltblown nonwoven fabrics.
- the crotch sheet 3 one of these nonwoven fabrics may be used alone, or two or more may be laminated.
- the crotch sheet 3 preferably contains an air-through nonwoven fabric. When the crotch sheet 3 contains an air-through non-woven fabric, the crotch sheet 3 tends to be bulky, and the distance between the water-absorbing absorbent fibers and the non-skin facing surface of the diaper 1 tends to increase, so that the feeling of wetness and stuffiness is reduced.
- the crotch sheet 3 can be composed of a single non-woven fabric made of three layers of air-through non-woven fabric, and it is preferable that the non-woven fabric contains absorbent fibers in layers other than the layer located closest to the non-skin facing side. .
- the water-absorbent fibers contained in the crotch sheet 3, the ventral exterior body 4A, or the back exterior body 4B include natural fibers, regenerated cellulose fibers such as rayon and lyocell, semi-synthetic cellulose fibers such as acetate fibers, polyvinyl alcohol fibers, and polystyrene fibers.
- natural fibers include cotton, wood pulp such as softwood pulp and hardwood pulp, and hemp fiber. Among these, cotton is preferred.
- a liquid-permeable sheet such as a nonwoven fabric or a perforated film can be used.
- the surface sheet 21 may have an uneven surface on the side facing the skin.
- a plurality of projections can be formed in a scattered pattern on the side of the surface facing the skin of the topsheet 21 .
- ridges and grooves extending in one direction may be alternately formed on the skin-facing surface of the topsheet 21 .
- the topsheet 21 may be formed using two or more nonwoven fabrics.
- the back sheet 22 for example, a liquid-impermeable or liquid-impermeable film, a spunbond/meltblown/spunbond laminated nonwoven fabric, or the like can be used.
- a plurality of micropores may be provided in a liquid-impermeable or liquid-hardly permeable film to impart water vapor permeability to the film.
- the outer surface of the backsheet 22 may be laminated with a sheet having good texture such as a non-woven fabric.
- the absorber 23 has an absorbent core.
- the absorbent core may be, for example, a pile of hydrophilic fibers such as cellulose such as pulp, a mixed pile of the hydrophilic fibers and an absorbent polymer, a pile of absorbent polymers, or two absorbent cores. It is composed of a laminate structure or the like in which an absorbent polymer is held between sheets. At least the skin-facing surface of the absorbent core may be covered with a liquid-permeable core-wrap sheet, or the entire surface including the skin-facing surface and the non-skin-facing surface may be covered with the core-wrap sheet.
- the core wrap sheet for example, a thin paper made of hydrophilic fibers, a liquid-permeable nonwoven fabric, or the like can be used.
- the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments and can be modified as appropriate.
- the length of the crotch sheet 3 in the vertical direction X of the diaper 1 is longer than the crotch portion C, and both ends of the crotch sheet 3 in the vertical direction X are
- the length of the crotch sheet 3 in the longitudinal direction X may be shorter than the crotch portion C.
- the crotch sheet 3 is placed in the crotch portion C from the viewpoint of making it difficult to perceive wetness and stuffiness. preferably located.
- the crotch sheet 3 is continuous from the abdomen side exterior body 4A to the back side exterior body 4B, but may be divided into a plurality of pieces in the longitudinal direction X of the diaper 1. In addition, the crotch sheet 3 may be divided into a plurality of pieces in the lateral direction Y of the diaper 1 .
- the three-layer laminated sheet shown in FIG. may have a laminated structure of four or more layers.
- the present invention can be applied to various other types of absorbent articles.
- the present invention can be applied to absorbent articles such as taped disposable diapers, sanitary napkins, panty sheets and incontinence pads.
- the present invention further discloses the following absorbent articles regarding the above-described embodiments.
- a ventral exterior body arranged on the abdomen side of the wearer in the worn state, a back exterior body arranged on the back side of the wearer in the worn state, and between the ventral exterior body and the dorsal exterior body
- the absorbent main body comprises an absorbent body, a topsheet arranged on the skin-facing side of the absorbent body, a backsheet arranged on the non-skin-facing side of the absorbent body, and the non-skin-facing backsheet of the backsheet.
- the crotch sheet contains absorbent fibers,
- the crotch sheet is configured based on the ratio of the water-absorbing fibers in the fibers constituting the non-woven fabric constituting the abdominal side exterior body and the ratio of the water-absorbing fibers in the fibers constituting the non-woven fabric constituting the back side exterior body.
- the difference between the ratio of the water-absorbing fibers in the fibers constituting the crotch sheet and the ratio of the water-absorbing fibers in the fibers constituting the nonwoven fabric constituting the abdominal exterior body is preferably 0.5% by mass or more and 10 % by mass or less, more preferably 1.0 to 5.0 mass %, still more preferably 2.0 to 3.0 mass %, the absorbent article according to ⁇ 1>.
- the difference between the ratio of the water-absorbing fibers in the fibers constituting the crotch sheet and the ratio of the water-absorbing fibers in the fibers constituting the nonwoven fabric constituting the back exterior body is preferably 0.5% by mass or more and 10 % by mass or less, more preferably 1.0% by mass or more and 5.0% by mass or less, and still more preferably 2.0% by mass or more and 3.0% by mass or less, according to ⁇ 1> or ⁇ 2> absorbent article.
- the crotch sheet has a multilayer structure of two or more layers,
- the crotch sheet has a three-layer structure, and the three layers of the crotch sheet are the first layer, the second layer, and the third layer in order from the skin-facing side to the non-skin-facing side.
- the ratio of the water-absorbent fibers in the fibers constituting the crotch sheet is more preferably 1.0% by mass or more and 4.0% by mass or less, more preferably 2.0% by mass or more and 3.0% by mass or less.
- the basis weight of the water-absorbing fibers in the crotch sheet is preferably 0.1 g/m 2 or more and 2.0 g/m 2 or less, more preferably 0.2 g/m 2 or more and 1.0 g/m 2 or less, and still more preferably. is 0.3 g/m 2 or more and 0.7 g/m 2 or less, the absorbent article according to any one of ⁇ 1> to ⁇ 7>.
- the crotch sheet is made of one of an air-through nonwoven fabric, a spunbonded nonwoven fabric, a spunlaced nonwoven fabric, an air-laid nonwoven fabric, a resin-bonded nonwoven fabric, and a meltblown nonwoven fabric, or a laminate of two or more of the above ⁇ 1> to The absorbent article according to any one of ⁇ 8>.
- ⁇ 11> The absorbent article according to any one of ⁇ 1> to ⁇ 10>, wherein the length of the crotch sheet and the length of the backsheet are the same in the longitudinal direction of the absorbent article.
- ⁇ 12> The absorbent article according to any one of ⁇ 1> to ⁇ 10>, wherein the length of the crotch sheet and the length of the backsheet are different in the longitudinal direction of the absorbent article.
- ⁇ 13> The crotch sheet is continuous from the abdominal exterior body to the dorsal exterior body, The absorbent article according to any one of ⁇ 1> to ⁇ 10>, wherein the length of the crotch sheet in the longitudinal direction of the absorbent article is shorter than the length of the backsheet.
- the ratio (L1/L2) of the length L1 of the crotch sheet to the length L2 of the back sheet (L1/L2) is preferably 0.2 or more and 1.0 or less, more preferably 0.3.
- the ratio of the water-absorbing fibers in the fibers constituting the nonwoven fabric constituting the ventral exterior body is preferably 0% by mass or more and 2.0% by mass or less, more preferably 0.1% by mass or more and 1.0% by mass or less. , and more preferably 0.3% by mass or more and 0.5% by mass or less, the absorbent article according to any one of ⁇ 1> to ⁇ 14>.
- the ratio of the water-absorbing fibers in the fibers constituting the nonwoven fabric constituting the back exterior body is preferably 0% by mass or more and 2.0% by mass or less, more preferably 0.1% by mass or more and 1.0% by mass or less.
- the basis weight of the water-absorbing fibers in the nonwoven fabric constituting the ventral exterior body is preferably 0.1 g/m 2 or more and 1.0 g/m 2 or less, more preferably 0.1 g/m 2 or more and 0.5 g/m 2 or more. m 2 or less, more preferably 0.1 g/m 2 or more and 0.2 g/m 2 or less, the absorbent article according to any one of ⁇ 1> to ⁇ 16>.
- the basis weight of the water-absorbing fibers in the nonwoven fabric constituting the back outer packaging is preferably 0.1 g/m 2 or more and 1.0 g/m 2 or less, more preferably 0.1 g/m 2 or more and 0.5 g/m 2 or more.
- the water-absorbent fibers are natural fibers, regenerated cellulose fibers such as rayon and lyocell, semi-synthetic cellulose fibers such as acetate fibers, or hydrophilic synthetic fibers such as polyvinyl alcohol fibers and polyacrylonitrile fibers.
- the absorbent main body has a first leak-preventing cuff and a second leak-preventing cuff on each side in the longitudinal direction of the absorbent article, the free ends of the second leak-preventing cuffs are positioned laterally outward of the absorbent article relative to the free ends of the first leak-preventing cuffs, the second leak-proof cuff has an elastic member extending along the longitudinal direction at a position near the free end of the second leak-proof cuff;
- an absorbent article that is less likely to cause the wearer to perceive a feeling of wetness or stuffiness and that can be manufactured economically.
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- Life Sciences & Earth Sciences (AREA)
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Abstract
Description
一実施形態において、前記吸収性本体は、吸収体と、該吸収体の肌対向面側に配された表面シートと、該吸収体の非肌対向面側に配された裏面シートと、該裏面シートの非肌対向面側に配された股下シートとを有することが好ましい。
一実施形態において、前記股下シートは吸水性繊維を含むことが好ましい。
一実施形態において、前記腹側外装体を構成する不織布を構成する繊維中の吸水性繊維の比率及び前記背側外装体を構成する不織布を構成する繊維中の吸水性繊維の比率よりも、前記股下シートを構成する繊維中の吸水性繊維の比率の方が高いことが好ましい。
本発明は、前述した従来技術が有する欠点を解消し得る吸収性物品に関する。
本実施形態において、吸収性本体2と重なる位置に配された弾性部材43は、該吸収性本体2と厚み方向に重なる領域において、細かく分断する等の処理によって、弾性伸縮性を発現しないように配されている。
吸収体23は、吸収性本体2と同様に、おむつ1の縦方向Xに長い形状を有している。吸収体23は、表面シート21と裏面シート22との間に介在配置されている。本実施形態では、図3に示すように、縦方向Xにおける吸収体23の両側部それぞれに弾性部材(以下、「吸収体ギャザー形成用弾性部材」ともいう。)24が配されている。吸収体ギャザー形成用弾性部材24は、縦方向Xに沿って伸長状態で配されている。吸収体ギャザー形成用弾性部材24は、吸収体23と表面シート21との間に固定されている。なお、説明の便宜上、図1においては、吸収体ギャザー形成用弾性部材24の図示を省略している。
裏面シート22は、液不透過性ないし液難透過性のものである。裏面シート22は透湿性を有する。また、裏面シート22は、水分を非吸収性のものである。裏面シート22は一般に、多孔質フィルムや、スパンボンド不織布とメルトブローン不織布とを積層した疎水性の複合不織布から構成される。疎水性とは25℃の水に対する接触角が90°以上であるような、水に対する馴染みにくさの性質のことである。
股下シート3の腹側部A側の端部域は、おむつ1の平面視において腹側外装体4Aと重なっている。一方、股下シート3の背側部B側の端部域は、おむつ1の平面視において背側外装体4Bと重なっている。
股下シート3の横方向Yの長さは、吸収性本体2の横方向Yの長さと一致しているか、又は図1に示すとおり、吸収性本体2の横方向Yの長さよりも若干短くなっている。図1には、股下シート3の各側縁から横方向Yの外方へ向けて吸収性本体2が延出した状態が示されている。
股下シート3における腹側部A側の端部域と、背側部B側の端部域との間の領域3Cは、おむつ1の股下部Cに位置している。以下、この領域3Cのことを「股下領域3C」ともいう。股下領域3Cにおいて股下シート3は、おむつ1の外面を形成している。股下シート3は吸水性繊維を含む繊維シートを有している。吸水性繊維は股下シート3の全域に存在している。股下シート3は通気性のものであり、透湿性を有している。
以上の利点は、股下シート3が外面に露出している領域である股下領域3C、換言すればおむつ1の股下部Cにおいて顕著なものとなる。また、腹側外装体4A及び背側外装体4Bの構成を工夫することによって、おむつ1の腹側部A及び背側部Bにおいても、以上の利点が顕著なものとなる。この工夫について以下に詳述する。
なお、腹側外装体4A及び背側外装体4Bにおいて、おむつ1の平面視で、裏面シート22から延出した領域には、該裏面シート22が存在しないので、吸収体23から生じた湿気の裏面シート22を通じての流通はない。
〔吸水性繊維の比率の測定方法〕
測定対象の不織布中に存在する吸水性繊維のみを染色する。染色には0.5質量%水溶液に調製した染料(愛染 食用色素 食用青色1号、ダイワ化成株式会社製)を用いる。0.5質量%水溶液に調製した染料に不織布を浸漬し、3分間静置後に取り出し、紙(キムタオル、日本製紙クレシア株式会社製)の上に載せ、不織布の上方から3kPaの荷重を1分間かけて脱水する。これにより構成繊維のうち、吸水性繊維のみが染色される。染色された吸水性繊維の位置を目視あるいは光学顕微鏡等を用いて確認しながら、吸水性繊維を含まない領域から非吸水性繊維を採取し、これを非吸水性試料とする。吸水性繊維と非吸水性繊維とが全体的に均一に混合され、吸水性繊維を含まない領域が見つからない場合には、ピンセット等を用いて非吸水性繊維のみを取り出す。この場合、取り出した非吸水性繊維を、温度105±2℃の電気乾燥機(例えば、株式会社いすゞ製作所製)内にて1時間静置した後、温度20±2℃、相対湿度65±2%の標準状態の環境下で、旭化成株式会社製サランラップ(登録商標)に試料を包んだ状態で、シリカゲル(例えば、豊田化工株式会社製)を入れたガラス製デシケータ(例えば、株式会社テックジャム製)内に入れて、繊維試料が温度20±2℃になるまで静置したものを、非吸水性試料とする。
非吸水性試料を細かく裁断し、高感度示差走査熱量計(DSC6200、セイコーインスツルメンツ株式会社製)を用いて、昇温速度10℃/分の条件で熱分析を行い、非吸水性試料の構成成分の融解ピーク温度T1とそのピーク面積S1を測定する。ピークが複数ある場合には、最もピーク面積が大きいピークを選択する。
次に、測定対象の不織布の任意の10箇所から取り出した繊維試料を一つにまとめて、上述した方法にて融解ピーク温度とピーク面積を測定し、非吸水性試料の融解ピーク温度T1付近(3℃以内)におけるピークのピーク面積S2から、下記式を用いて吸水性繊維の比率C(質量%)を算出する。
C=(1-S2/S1)×100
なお、測定は3回繰り返し、その平均値を吸水性繊維の比率とする。
図2に示すおむつ1において、股下シート3は3層構造を有している。股下シート3が有する3層を、肌対向面側から非肌対向面側に沿って順に、第1層31、第2層32、第3層33とする。吸水性繊維は、第3層33以外の層、即ち、第1層31及び第2層32の少なくとも1層に含まれていることが好ましい。第1層31及び第2層32の両方に吸水性繊維が含まれていてもよい。あるいは第1層31のみに吸水性繊維が含まれていてもよい。
吸水性繊維が、最も非肌対向面側に位置する第3層33以外の層に含まれていることにより、裏面シート22を透過した湿気が、股下シート3における、相対的に肌対向面側に位置する層31,32に吸収されやすくなる。したがって、湿気を吸収保持した股下シート3によっておむつ1の着用者の衣服が濡れてしまうことや、股下シート3とおむつ1の着用者の衣服との間に湿気が溜まることを防ぐことができる。
第1防漏カフ5は、図3に示すとおり、横方向Yの一端側が他の部材に固定された固定端部5aとなっている。また第1防漏カフ5は、横方向Yの他端側が他の部材に非固定の自由端部5bとなっている。第1防漏カフ5は、第1防漏カフ5の自由端寄りの位置に複数本の弾性部材(以下、「第1防漏カフ形成用弾性部材」ともいう。)53を有している。第1防漏カフ形成用弾性部材53は、縦方向Xに沿って伸長状態で配されている。
第1防漏カフ5は、おむつ1の装着状態において、第1防漏カフ形成用弾性部材53の収縮力により、少なくとも股下部Cにおいて、自由端部5b側が、固定端部5aを起立基端として着用者側に起立する。これによって尿等の排泄物の横方向Yの外方への流出が阻止される。
少なくともおむつ1の自然状態において、股下シート3の各側縁3e,3eが、吸収性本体2の各側縁2e,2eまで達していないことが好ましい。
少なくともおむつ1の自然状態において、股下シート3の各側縁3e,3eが、第2防漏カフ形成用弾性部材63まで達していないことが好ましい。
股下シート3は、おむつ1の平面視において、第1防漏カフ形成用弾性部材53と重なっていてもよいし、重なっていなくてもよい。
股下シート3は、おむつ1の平面視において、吸収体ギャザー形成用弾性部材24と重なっていてもよいし、重なっていなくてもよい。
吸収体23から生じた湿気を、股下シート3が過不足なく吸収できるようにする観点からは、おむつ1の縦方向Xにおける、股下シート3の各側縁3e,3eの位置が、吸収体23の各側縁23e,23eの位置と一致していることが好ましい。
当該重複領域には、開孔が配されていることが好ましい。この開孔は、腹側外装体4Aの重複領域Ra及び背側外装体4Bの重複領域Rbの両方又はいずれか一方のみに配されていてもよい。腹側外装体4A又は背側外装体4Bの重複領域Ra,Rbに開孔が配されている場合、該開孔は、肌対向面側及び非肌対向面側の両方に配されていてもよいし、一方のみに配されていてもよい。具体的には、腹側外装体4A又は背側外装体4Bにおける外層シート42及び内層シート41の両方のシートに開孔が配されていてもよいし、いずれか一方のシートのみに開孔が配されていてもよい。当該開孔は、複数配されていることが好ましい。
本実施形態では、重複領域に、腹側外装体4A又は背側外装体4Bを貫通する開孔が複数配されている。具体的には、腹側外装体4Aの重複領域Raに、該腹側外装体4Aを貫通する開孔が複数配されており、当該開孔は、腹側外装体4Aを貫通していることがこのましい。背側外装体4Bの重複領域Rbに、該背側外装体4Bを貫通する開孔が複数配されている。
天然繊維としては、コットン、針葉樹パルプや広葉樹パルプ等の木材パルプ、麻繊維等が挙げられ、これらの中でもコットンを用いることが好ましい。
例えば、図1に示す実施形態では、股下シート3は、おむつ1の縦方向Xの長さが股下部Cよりも長く、股下シート3の該縦方向Xの両端部は、おむつ1の平面視において腹側外装体4A又は背側外装体4Bと重なっているが、股下シート3は、該縦方向Xの長さが股下部Cよりも短くてもよい。股下シート3における前記縦方向Xの長さL1が、股下部Cにおける前記縦方向Xの長さよりも短い場合、濡れ感や蒸れ感を知覚しづらくする観点から、股下シート3は股下部Cに位置していることが好ましい。
<1>
着用状態において着用者の腹側に配される腹側外装体と、着用状態において着用者の背側に配される背側外装体と、該腹側外装体と該背側外装体との間に掛け渡して固定された吸収性本体とを有する吸収性物品であって、
前記吸収性本体は、吸収体と、該吸収体の肌対向面側に配された表面シートと、該吸収体の非肌対向面側に配された裏面シートと、該裏面シートの非肌対向面側に配された股下シートとを有し、
前記股下シートは吸水性繊維を含み、
前記腹側外装体を構成する不織布を構成する繊維中の吸水性繊維の比率及び前記背側外装体を構成する不織布を構成する繊維中の吸水性繊維の比率よりも、前記股下シートを構成する繊維中の吸水性繊維の比率の方が高い、吸収性物品。
前記股下シートを構成する繊維中の吸水性繊維の比率と、前記腹側外装体を構成する不織布を構成する繊維中の吸水性繊維の比率との差は、好ましくは0.5質量%以上10質量%以下、より好ましくは1.0質量%以上5.0質量%以下、更に好ましくは2.0質量%以上3.0質量%以下である、前記<1>に記載の吸収性物品。
<3>
前記股下シートを構成する繊維中の吸水性繊維の比率と、前記背側外装体を構成する不織布を構成する繊維中の吸水性繊維の比率との差は、好ましくは0.5質量%以上10質量%以下、より好ましくは1.0質量%以上5.0質量%以下、更に好ましくは2.0質量%以上3.0質量%以下である、前記<1>又は前記<2>に記載の吸収性物品。
<4>
前記股下シートは2層以上の複層構造を有し、
前記股下シートにおける最も非肌対向面側に位置する層以外の層に、前記吸水性繊維が含まれている、前記<1>ないし前記<3>のいずれか一に記載の吸収性物品。
<5>
前記股下シートは3層構造を有し、該股下シートが有する3層を、肌対向面側から非肌対向面側に沿って順に、第1層、第2層、第3層としたときに、第3層以外の層に、前記吸水性繊維が含まれている、前記<1>ないし前記<4>のいずれか一に記載の吸収性物品。
前記股下シートを構成する繊維中の前記吸水性繊維の比率は、0.5質量%以上5質量%以下である、前記<1>ないし前記<5>のいずれか一に記載の吸収性物品。
<7>
前記股下シートを構成する繊維中の吸水性繊維の比率は、より好ましくは1.0質量%以上4.0質量%以下、更に好ましくは2.0質量%以上3.0質量%以下である、前記<1>ないし前記<6>のいずれか一に記載の吸収性物品。
<8>
前記股下シート中の吸水性繊維の坪量は、好ましくは0.1g/m2以上2.0g/m2以下、より好ましくは0.2g/m2以上1.0g/m2以下、更に好ましくは0.3g/m2以上0.7g/m2以下である、前記<1>ないし前記<7>のいずれか一に記載の吸収性物品。
<9>
前記股下シートは、エアスルー不織布、スパンボンド不織布、スパンレース不織布、エアレイド不織布、レジンボンド不織布及びメルトブローン不織布のうち、1種からなるか、又は2種以上を積層したものからなる、前記<1>ないし前記<8>のいずれか一に記載の吸収性物品。
<10>
前記股下シートは、エアスルー不織布を含む、前記<1>ないし前記<9>のいずれか一に記載の吸収性物品。
前記吸収性物品の縦方向において、前記股下シートの長さと前記裏面シートの長さとは同じである、前記<1>ないし前記<10>のいずれか一に記載の吸収性物品。
<12>
前記吸収性物品の縦方向において、前記股下シートの長さと前記裏面シートの長さとは異なっている、前記<1>ないし前記<10>のいずれか一に記載の吸収性物品。
<13>
前記股下シートは、前記腹側外装体から前記背側外装体まで連続しており、
前記吸収性物品の縦方向において、前記股下シートの長さは、前記裏面シートの長さよりも短い、前記<1>ないし前記<10>のいずれか一に記載の吸収性物品。
<14>
前記吸収性物品の縦方向において、前記裏面シートの長さL2に対する前記股下シートの長さL1の比(L1/L2)は、好ましくは0.2以上1.0以下、より好ましくは0.3以上0.8以下、更に好ましくは0.4以上0.6以下である、前記<1>ないし前記<13>のいずれか一に記載の吸収性物品。
前記腹側外装体を構成する不織布を構成する繊維中の吸水性繊維の比率は、好ましくは0質量%以上2.0質量%以下、より好ましくは0.1質量%以上1.0質量%以下、更に好ましくは0.3質量%以上0.5質量%以下である、前記<1>ないし前記<14>のいずれか一に記載の吸収性物品。
<16>
前記背側外装体を構成する不織布を構成する繊維中の吸水性繊維の比率は、好ましくは0質量%以上2.0質量%以下、より好ましくは0.1質量%以上1.0質量%以下、更に好ましくは0.3質量%以上0.5質量%以下である、前記<1>ないし前記<15>のいずれか一に記載の吸収性物品。
<17>
前記腹側外装体を構成する不織布中の吸水性繊維の坪量は、好ましくは0.1g/m2以上1.0g/m2以下、より好ましくは0.1g/m2以上0.5g/m2以下、更に好ましくは0.1g/m2以上0.2g/m2以下である、前記<1>ないし前記<16>のいずれか一に記載の吸収性物品。
<18>
前記背側外装体を構成する不織布中の吸水性繊維の坪量は、好ましくは0.1g/m2以上1.0g/m2以下、より好ましくは0.1g/m2以上0.5g/m2以下、更に好ましくは0.1g/m2以上0.2g/m2以下である、前記<1>ないし前記<17>のいずれか一に記載の吸収性物品。
前記腹側外装体及び前記背側外装体は、前記吸水性繊維を非含有である、前記<1>ないし前記<18>のいずれか一に記載の吸収性物品。
<20>
前記吸水性繊維は、天然繊維、レーヨンやリヨセル等の再生セルロース繊維、アセテート繊維などの半合成セルロース繊維、又はポリビニルアルコール繊維やポリアクリロニトリル繊維等の親水性合成繊維である、前記<1>ないし前記<19>のいずれか一に記載の吸収性物品。
<21>
前記吸収性物品の縦方向における、前記股下シートの各側縁は、前記吸収性本体の各側縁まで達していない、前記<1>ないし前記<20>のいずれか一に記載の吸収性物品。
<22>
前記吸収性本体は、前記吸収性物品の縦方向の両側部それぞれに、第1防漏カフ及び第2防漏カフを有し、
第2防漏カフの自由端は、第1防漏カフの自由端よりも、前記吸収性物品の横方向外方に位置し、
第2防漏カフは、第2防漏カフの前記自由端寄りの位置に、前記縦方向に沿って延びる弾性部材を有し、
前記股下シートは、前記吸収性物品の平面視において、第2防漏カフの前記弾性部材と重なっていない、前記<1>ないし前記<21>のいずれか一に記載の吸収性物品。
<23>
前記吸収性物品の縦方向における、前記股下シートの各側縁の位置が、前記吸収体の各側縁の位置と一致している、前記<1>ないし前記<22>のいずれか一に記載の吸収性物品。
<24>
前記腹側外装体又は前記背側外装体は、前記吸収性物品の平面視において、前記股下シートと重なる領域を有し、
前記領域に、開孔が配されている、前記<1>ないし前記<23>のいずれか一に記載の吸収性物品。
<25>
前記開孔は、前記腹側外装体又は前記背側外装体を厚み方向に貫通する開孔である、前記<24>に記載の吸収性物品。
<26>
前記吸水性繊維は、天然繊維である、前記<1>ないし前記<25>のいずれか一に記載の吸収性物品。
<27>
前記天然繊維は、コットンである、前記<26>に記載の吸収性物品。
Claims (25)
- 着用状態において着用者の腹側に配される腹側外装体と、着用状態において着用者の背側に配される背側外装体と、該腹側外装体と該背側外装体との間に掛け渡して固定された吸収性本体とを有する吸収性物品であって、
前記吸収性本体は、吸収体と、該吸収体の肌対向面側に配された表面シートと、該吸収体の非肌対向面側に配された裏面シートと、該裏面シートの非肌対向面側に配された股下シートとを有し、
前記股下シートは吸水性繊維を含み、
前記腹側外装体を構成する不織布を構成する繊維中の吸水性繊維の比率及び前記背側外装体を構成する不織布を構成する繊維中の吸水性繊維の比率よりも、前記股下シートを構成する繊維中の吸水性繊維の比率の方が高い、吸収性物品。 - 前記股下シートを構成する繊維中の吸水性繊維の比率と、前記腹側外装体を構成する不織布を構成する繊維中の吸水性繊維の比率との差は、0.5質量%以上10質量%以下である、請求項1に記載の吸収性物品。
- 前記股下シートを構成する繊維中の吸水性繊維の比率と、前記背側外装体を構成する不織布を構成する繊維中の吸水性繊維の比率との差は、0.5質量%以上10質量%以下である、請求項1又は2に記載の吸収性物品。
- 前記股下シートは2層以上の複層構造を有し、
前記股下シートにおける最も非肌対向面側に位置する層以外の層に、前記吸水性繊維が含まれている、請求項1ないし3のいずれか一項に記載の吸収性物品。 - 前記股下シートは3層構造を有し、該股下シートが有する3層を、肌対向面側から非肌対向面側に沿って順に、第1層、第2層、第3層としたときに、第3層以外の層に、前記吸水性繊維が含まれている、請求項1ないし4のいずれか一項に記載の吸収性物品。
- 前記股下シートを構成する繊維中の前記吸水性繊維の比率は、0.5質量%以上5質量%以下である、請求項1ないし5のいずれか一項に記載の吸収性物品。
- 前記股下シート中の吸水性繊維の坪量は、0.1g/m2以上2.0g/m2以下である、請求項1ないし6のいずれか一項に記載の吸収性物品。
- 前記股下シートは、エアスルー不織布を含む、請求項1ないし7のいずれか一項に記載の吸収性物品。
- 前記吸収性物品の縦方向において、前記股下シートの長さと前記裏面シートの長さとは同じである、請求項1ないし8のいずれか一項に記載の吸収性物品。
- 前記吸収性物品の縦方向において、前記股下シートの長さと前記裏面シートの長さとは異なっている、請求項1ないし8のいずれか一項に記載の吸収性物品。
- 前記股下シートは、前記腹側外装体から前記背側外装体まで連続しており、
前記吸収性物品の縦方向において、前記股下シートの長さは、前記裏面シートの長さよりも短い、請求項1ないし10のいずれか一項に記載の吸収性物品。 - 前記吸収性物品の縦方向において、前記裏面シートの長さL2に対する前記股下シートの長さL1の比(L1/L2)は、0.2以上1.0以下である、請求項1ないし11のいずれか一項に記載の吸収性物品。
- 前記腹側外装体を構成する不織布を構成する繊維中の吸水性繊維の比率は、0質量%以上2.0質量%以下である、請求項1ないし12のいずれか一項に記載の吸収性物品。
- 前記背側外装体を構成する不織布を構成する繊維中の吸水性繊維の比率は、0質量%以上2.0質量%以下である、請求項1ないし13のいずれか一項に記載の吸収性物品。
- 前記腹側外装体を構成する不織布中の吸水性繊維の坪量は、0.1g/m2以上1.0g/m2以下である、請求項1ないし14のいずれか一に記載の吸収性物品。
- 前記背側外装体を構成する不織布中の吸水性繊維の坪量は、0.1g/m2以上1.0g/m2以下である、請求項1ないし15のいずれか一項に記載の吸収性物品。
- 前記腹側外装体及び前記背側外装体は、前記吸水性繊維を非含有である、請求項1ないし16のいずれか一項に記載の吸収性物品。
- 前記吸水性繊維は、天然繊維、レーヨンやリヨセル等の再生セルロース繊維、アセテート繊維などの半合成セルロース繊維、又はポリビニルアルコール繊維やポリアクリロニトリル繊維等の親水性合成繊維である、請求項1ないし17のいずれか一項に記載の吸収性物品。
- 前記吸収性物品の縦方向における、前記股下シートの各側縁は、前記吸収性本体の各側縁まで達していない、請求項1~18のいずれか一項に記載の吸収性物品。
- 前記吸収性本体は、前記吸収性物品の縦方向の両側部それぞれに、第1防漏カフ及び第2防漏カフを有し、
第2防漏カフの自由端は、第1防漏カフの自由端よりも、前記吸収性物品の横方向外方に位置し、
第2防漏カフは、第2防漏カフの前記自由端寄りの位置に、前記縦方向に沿って延びる弾性部材を有し、
前記股下シートは、前記吸収性物品の平面視において、第2防漏カフの前記弾性部材と重なっていない、請求項1~19のいずれか一項に記載の吸収性物品。 - 前記吸収性物品の縦方向における、前記股下シートの各側縁の位置が、前記吸収体の各側縁の位置と一致している、請求項1~20のいずれか一項に記載の吸収性物品。
- 前記腹側外装体又は前記背側外装体は、前記吸収性物品の平面視において、前記股下シートと重なる領域を有し、
前記領域に、開孔が配されている、請求項1~21のいずれか一項に記載の吸収性物品。 - 前記開孔は、前記腹側外装体又は前記背側外装体を厚み方向に貫通する開孔である、請求項22に記載の吸収性物品。
- 前記吸水性繊維は、天然繊維である、請求項1~23のいずれか一項に記載の吸収性物品。
- 前記天然繊維は、コットンである、請求項24に記載の吸収性物品。
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Citations (3)
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JP2016087286A (ja) * | 2014-11-10 | 2016-05-23 | 花王株式会社 | パンツ型吸収性物品 |
JP2018079036A (ja) * | 2016-11-15 | 2018-05-24 | 花王株式会社 | 吸収性物品 |
JP2020103430A (ja) * | 2018-12-26 | 2020-07-09 | 花王株式会社 | 吸収性物品 |
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JP2016087286A (ja) * | 2014-11-10 | 2016-05-23 | 花王株式会社 | パンツ型吸収性物品 |
JP2018079036A (ja) * | 2016-11-15 | 2018-05-24 | 花王株式会社 | 吸収性物品 |
JP2020103430A (ja) * | 2018-12-26 | 2020-07-09 | 花王株式会社 | 吸収性物品 |
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