JP4035070B2 - Liquid-permeable surface sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid-permeable surface sheet disposed on the skin contact side of a disposable wearing article that absorbs and holds body fluid.
[0002]
[Prior art]
There is a liquid-permeable surface layer disposed on the skin contact side of a disposable wearing article that absorbs and retains body fluid (see Patent Document 1). The surface layer disclosed in Patent Document 1 is composed of a plurality of thermoplastic synthetic resin filaments extending in parallel in the longitudinal direction of the article and parallel in the lateral direction. The filament has a basis weight of 10 to 200 g / m. ² The fineness is in the range of 1 to 10 d (denier). The filaments are fixed through a large number of heat-sealing wires. The heat-sealing lines extend intermittently in the horizontal direction and are arranged at predetermined intervals in the vertical direction.
[0003]
Since the surface layer uses filaments, the surface layer has flexibility and cushioning properties. Good wear feeling of the article using the surface layer, and further, the filaments of the plurality of stripes extend in parallel to each other in the longitudinal direction. Therefore, the bodily fluid can be quickly diffused in the vertical direction by the capillary action of the filament, and the flow of the bodily fluid in the vertical direction can be promoted.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-151152
[0005]
[Problems to be solved by the invention]
In the surface layer disclosed in Patent Document 1, since the filaments constituting the surface layer extend substantially flat in the vertical direction without undulating in the vertical direction, there is almost no bulk of the surface layer above the article, and the surface layer is constant. However, the surface layer in contact with the wearer's skin is still insufficient. In addition, it is difficult for the surface layer to suppress the flow of the body fluid because the body fluid quickly diffuses in the direction in which the filament extends due to the capillary action of the filament.
[0006]
An object of the present invention is to provide a liquid-permeable surface sheet that has a good touch and can suppress the flow of body fluid.
[0007]
[Means for Solving the Problems]
The premise of the present invention for solving the above problems is composed of a liquid-permeable base sheet and a plurality of filaments positioned on the outer surface of the base sheet and extending in a first direction, and absorbs and retains body fluids It is a liquid-permeable surface sheet arrange | positioned at the skin contact side of the disposable wearing article.
[0008]
The feature of the present invention in the premise is that the filaments form a group extending in the second direction substantially in parallel to the second direction intersecting the first direction, and the group of the filaments is the second direction. The filaments are fixed to the base sheet through at least one joining line extending continuously in the direction, and the free portions of the filaments extending from the joining line are raised upward from the outer surface of the base sheet based on the joining line. This is because a bulky cotton body is formed.
[0009]
The present invention has the following embodiments.
(1) The free parts of the filaments are entangled with each other.
(2) The free part of the filament is crimped.
(3) In the top sheet, a difference is provided in the basis weight of a group of the filaments toward the second direction, and the bulk of the cotton bodies is different toward the second direction.
(4) In the top sheet, a difference is provided in the lengths of the free portions of the filaments in the second direction, and the bulk of the cotton bodies is different in the second direction.
(5) The basis weight of a group of the filaments is 20 to 700 g / m. ² The length of the free part of the filament is in the range of 10 to 100 mm, and the fineness of the filament is in the range of 1.2 to 20.0 dtex.
(6) At least two cotton bodies are formed on the outer surface of the base sheet.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The details of the liquid-permeable surface sheet according to the present invention will be described with reference to the accompanying drawings.
[0011]
1 and 2 are a perspective view of a liquid-permeable topsheet 1A shown as an example, and an end view taken along line II-II in FIG. 1, and FIG. 3 is an end view taken along line III-III in FIG. In FIG. 1, the horizontal direction is indicated by an arrow L, the vertical direction is indicated by an arrow M, and the vertical direction is indicated by an arrow N. In this embodiment, the horizontal direction corresponds to the first direction of the claims, and the vertical direction corresponds to the second direction of the claims. However, the horizontal direction may be the second direction of the claims, and the vertical direction may be the first direction of the claims.
[0012]
1 A of surface sheets are comprised from the hydrophilic fiber nonwoven fabric 2 (liquid-permeable base sheet) and the multiple filaments of the hydrophilic filament 3 located in the outer surface of the nonwoven fabric 2. As shown in FIG. This top sheet 1A is disposed on the skin contact side of a disposable wearing article that absorbs and holds excrement.
[0013]
As the non-woven fabric 2, one produced by a known production method of spunlace, needle punch, melt blown, thermal bond, spunbond, or chemical bond can be used. The nonwoven fabric 2 is a composite nonwoven fabric (SM nonwoven fabric or SMS) obtained by laminating a fiber nonwoven fabric having high strength and flexibility manufactured by a spunbond manufacturing method on at least one surface of a fiber nonwoven fabric having high water resistance manufactured by a melt blown manufacturing method. Nonwoven fabric) can also be used.
[0014]
The nonwoven fabric 2 can be made of any one of thermoplastic synthetic resin fibers, semi-synthetic fibers and regenerated fibers that have been subjected to a hydrophilic treatment, or composite fibers obtained by mixing these fibers. Although there is no limitation in particular in a synthetic resin fiber, A polyester type, a polyacrylonitrile type, a polyvinyl chloride type, a polyethylene type, a polypropylene type, and a polystyrene type can be used. As the synthetic resin fiber, a core-sheath type composite fiber, a parallel type composite fiber, an atypical hollow fiber, a microporous fiber, or a bonded type composite fiber can be used. Cellulose and protein fibers can be used for semi-synthetic fibers and regenerated fibers. Semi-synthetic fibers and regenerated fibers can be subjected to a hydrophilic treatment in order to improve hydrophilicity.
[0015]
The nonwoven fabric 2 may have elastic stretchability. As the stretchable nonwoven fabric, nonwoven fabrics manufactured by melt blown and spunbond manufacturing methods can be used. The stretchable nonwoven fabric can be made from stretchable fibers obtained by melting and spinning a thermoplastic elastomer resin. The stretchable fiber needs to be subjected to a hydrophilic treatment.
[0016]
The filaments 3 are arranged in parallel in the longitudinal direction of the nonwoven fabric 2 and form a group extending in the longitudinal direction. A group of these filaments 3 is fixed to the nonwoven fabric 2 via a single joining line 4 extending continuously in the longitudinal direction. The filament 3 has a base end portion 3 a fixed to the nonwoven fabric 2 and a free portion 3 b not fixed to the nonwoven fabric 2. In these filaments 3, free portions 3 b extending laterally from both sides of the joining line 4 are raised upward from the outer surface of the nonwoven fabric 2 with the joining line 4 (base end part 3 a) as a base point. The free portions 3b of the filaments 3 are crimped and entangled with each other to form a bulky cotton body 5 (cotton) that is long in the vertical direction.
[0017]
As the filament 3, similarly to the nonwoven fabric 2, any one of thermoplastic synthetic resin fibers, semi-synthetic fibers and regenerated fibers that have been subjected to a hydrophilic treatment, or composite fibers obtained by mixing these fibers may be used. It is also possible to use a core-sheath type composite fiber, a parallel type composite fiber, an irregular hollow fiber, a microporous fiber, or a bonded type composite fiber.
[0018]
The filament 3 has a group weight of 20 to 700 g / m. ² The length of the free part 3b is in the range of 10 to 100 mm. The basis weight of a group of filaments 3 is 20 g / m ² If the length is less than 10 mm and the length of the free part 3 b is less than 10 mm, the bulk of the cotton body 5 formed from the free part 3 b cannot be increased, and the compressibility and flexibility of the cotton body 5 are reduced. The basis weight of a group of filaments 3 is 700 g / m ² When the length of the free part exceeds 100 mm, the bulk of the cotton body 5 becomes unnecessarily large, and when the topsheet 1A is used as a wearing article, the cotton body 5 is bulky and feels uncomfortable with the article. There is. The filament 3 has a fineness of 1.2 to 20.0 dtex, preferably 1.2 to 6.0 dtex. If the fineness of the filament 3 exceeds 20.0 dtex, the rigidity of the cotton body 5 increases and the flexibility of the cotton body 5 decreases. The basis weight of a group of the filaments 3 is substantially uniform over the entire area of the cotton body 5, and the bulk of the cotton body 5 is approximately uniform over the front area.
[0019]
An example of the manufacturing method of this surface sheet 1A is as follows. A plurality of filaments 3 extending in the lateral direction are arranged on the outer surface of the hydrophilic fiber nonwoven fabric 2, and the filaments 3 are aligned substantially in parallel in the longitudinal direction in a state where both ends of the filaments 3 are substantially matched. Next, the filaments 3 are fixed to the non-woven fabric 2 through the joining line 4 continuously extending in the vertical direction. The joining line 4 is formed at a position that substantially bisects the length of the filament 3. However, the joining wire 4 may be formed at a position biased to either one of both ends of the filament 3.
[0020]
After fixing the filament 3 to the nonwoven fabric 2 via the bonding line 4, the free portions 3 b of the filament 3 positioned on both sides of the bonding line 4 and extending in the lateral direction are raised upward from the outer surface of the nonwoven fabric 2, and the filament 3 The free parts 3b are entangled with each other. In the top sheet 1A, one cotton body 5 is formed from the free portions 3b of the filaments 3 entangled with each other.
[0021]
In order to fix the filament 3 to the non-woven fabric 2, it is possible to use a heat sealing technique or use an adhesive. When using heat fusion, the nonwoven fabric 2 must be made of thermoplastic synthetic resin fibers, or the nonwoven fabric 2 must contain thermoplastic synthetic resin fibers, and the thermoplastic synthetic resin fibers are used for the filaments 3. There is a need. Thermal fusion techniques include ultrasonic bonding and hot press bonding. When an adhesive is used, there is no particular limitation on the fibers used for the nonwoven fabric 2 and the filament 3. As the adhesive, it is preferable to use a hot-melt adhesive, but in addition to the hot-melt adhesive, an acrylic adhesive or a rubber adhesive can also be used.
[0022]
4 and 5 are a perspective view of a liquid-permeable surface sheet 1B shown as another example, and an end view taken along line VV in FIG. 4, and FIG. 6 is an end view taken along line VI-VI in FIG. . In FIG. 4, the horizontal direction is indicated by an arrow L, the vertical direction is indicated by an arrow M, and the vertical direction is indicated by an arrow N.
[0023]
The topsheet 1B is the same as that shown in FIG. 1 in that the topsheet 1B is composed of a hydrophilic fiber nonwoven fabric 2 (liquid-permeable base sheet) and a plurality of hydrophilic filaments 3 located on the outer surface of the nonwoven fabric 2. The fiber nonwoven fabric 2 and the filament 3 which comprise this surface sheet 1B can use the same fiber as those of FIG. The surface sheet 1B is different from that shown in FIG. 1 in that three cotton bodies 5 formed from the filaments 3 are arranged in the horizontal direction, and the bulk of the cotton bodies 5 is different in the vertical direction.
[0024]
The filaments 3 are arranged in parallel in the longitudinal direction of the nonwoven fabric 2 and form a group extending in the longitudinal direction. A group of the filaments 3 are arranged at substantially equal intervals in the lateral direction. A group of filaments 3 is fixed to the nonwoven fabric 2 via a single joining line 4 that extends continuously in the longitudinal direction. The filament 3 has a base end portion 3 a fixed to the nonwoven fabric 2 and a free portion 3 b not fixed to the nonwoven fabric 2. In these filaments 3, free portions 3 b extending laterally from both sides of the joining line 4 are raised upward from the outer surface of the nonwoven fabric 2 with the joining line 4 (base end part 3 a) as a base point. The free portions 3b of the filaments 3 are crimped and entangled with each other to form a bulky cotton body 5 (cotton) that is long in the vertical direction.
[0025]
In the topsheet 1B, a difference is provided in the basis weight of a group of the filaments 3 in the vertical direction, and a difference is provided in the lengths of the free portions 3b of the filaments 3 in the vertical direction. The filament 3 has a group of basis weights gradually increasing from one end 6 to the other end 7 of the cotton body 5, and the length of the free part 3 b is from the one end 6 to the other end of the cotton body 5. It gradually increases toward 7. These cotton bodies 5 gradually increase in volume from one end 6 toward the other end 7.
[0026]
The basis weight of a group of filaments 3 at one end 6 of the cotton body 5 is 20 to 80 g / m. ² Range, preferably 40-60 g / m ² It is in the range. The basis weight of a group of filaments 3 at the other end 7 of the cotton body 5 is 300 to 700 g / m. ² Range, preferably 400-500 g / m ² It is in the range. The length of the free part 3b of the filament 3 at the one end 6 of the cotton body 5 is in the range of 10 to 30 mm, and the length of the free part 3b of the filament 3 at the other end 7 of the cotton body 5 is 30 to 100 mm. It is in the range. In order to provide a difference in the bulk of the cotton body 5, a difference may be provided in at least one of the group weight of the filament 3 and the length of the free portion 3b of the filament 3. The fineness of the filament 3 is the same as that of FIG.
[0027]
The basis weight of a group of filaments 3 at one end 6 is 20 g / m. ² If the length of the free portion 3b of the filament 3 in the end portion 6 is less than 10 mm, the bulk of the end portion 6 of the cotton body 5 formed from the free portion 3b cannot be increased. The compressibility and flexibility in 6 will be reduced. The basis weight of a group of filaments 3 at the other end 7 is 700 g / m. ² And the length of the free portion 3b of the filament 3 at the other end 7 exceeds 100 mm, the bulk of the cotton body 5 becomes unnecessarily large, and when the topsheet 1B is used for a worn article, the cotton body 5 There is a sense of incongruity with articles worn bulky.
[0028]
An example of the manufacturing method of this surface sheet 1B is as follows. A plurality of filaments 3 extending in the transverse direction are arranged on the outer surface of the hydrophilic fiber nonwoven fabric 2, and the filaments 3 are aligned substantially in parallel in the longitudinal direction. More filaments 3 are arranged at the other end 7 than at the one end 6 so that the basis weight of the one end 6 of the filament 3 is different from that of the other end 7.
[0029]
Next, the filament 3 is fixed to the non-woven fabric 2 through three joining lines 4 extending in the longitudinal direction. The joining lines 4 are arranged at substantially equal intervals in the lateral direction. After fixing the filament 3 to the nonwoven fabric 2 through the bonding line 4, the filament 3 is cut in the longitudinal direction between the bonding lines 4. When the filament 3 is cut, in order to make the length of the free portion 3b of the filament 3 at the one end 6 shorter than that of the filament 3 at the other end 7, a part of the filament 3 at the one end 6 is cut off.
[0030]
Next, the free portions 3b of the filaments 3 positioned on both sides of the joining line 4 and extending in the lateral direction are raised upward from the outer surface of the nonwoven fabric 2, and the free portions 3b of the filaments 3 are entangled with each other. Three cotton bodies 5 are formed on the top sheet 1B from free portions 3b of the filaments 3 entangled with each other. In order to fix the filament 3 to the non-woven fabric 2, it is possible to use a heat sealing technique or use an adhesive.
[0031]
In the illustrated topsheets 1A and 1B, the cotton body 5 is formed of a plurality of filaments 3 raised upward from the outer surface of the nonwoven fabric 2, so that the cotton body 5 has high compressibility and good flexibility. And the touch of sheet | seat 1A, 1B which touches a wearer's skin can be improved. As for these surface sheets 1A and 1B, the cotton body 5 freely deforms together with the nonwoven fabric 2, and the cotton body 5 can follow the movement of the wearer. Since the surface sheets 1A and 1B are arranged on the skin contact side of the disposable wearing article, the wearing feeling of the article is improved.
[0032]
The surface sheet 1B of FIG. 4 is different in the bulk of the cotton body 5 in the vertical direction, and suppresses the flow of body fluid at the other end 7 of the cotton body 5 as compared with the flow of body fluid at the one end 6 of the cotton body 5. Therefore, the flow direction and flow amount of the body fluid in the top sheet 1B can be adjusted using the cotton body 5.
[0033]
In these surface sheets 1A and 1B, the number of the cotton bodies 5 is not particularly limited, and two or four or more cotton bodies 5 may be formed on the sheets 1A and 1B. In the top sheets 1A and 1B, the cotton bodies 5 may extend in the horizontal direction, and two or more cotton bodies 5 may be intermittently arranged in the vertical direction. In the filament 3, the free portions 3b may not be entangled with each other, and the free portion 3b may not be crimped. In the cotton body 5, a group of filaments 3 may be fixed to the nonwoven fabric 2 via two joining wires 4.
[0034]
In the topsheet 1A of FIG. 1, the bulk of the cotton body 5 may be different in the longitudinal direction. In the surface sheet 1B of FIG. 4, the bulk of the cotton body 5 may be substantially uniform over the entire region, and the bulk of the cotton body 5 may be large at one end portion 6 and small at the other end portion 7.
[0035]
In addition to the hydrophilic fiber nonwoven fabric 2, any one of a hydrophobic fiber nonwoven fabric having many openings and a plastic film having many fine openings can be used for the liquid-permeable base sheet. .
[0036]
7 and 8 are a partially broken perspective view of the disposable sanitary napkin 10 using the top sheet 1A of FIG. 1 and a sectional view taken along line VIII-VIII in FIG. 7, and FIG. It is IX-IX arrow directional cross-sectional view. In FIG. 7, the horizontal direction is indicated by an arrow L, the vertical direction is indicated by an arrow M, and the vertical direction is indicated by an arrow N. The inner surfaces of the front and back sheets 1A and 11 are surfaces facing the core 12, and the outer surfaces of the sheets 1A and 11 are surfaces not facing the core 12.
[0037]
The napkin 10 includes a liquid-permeable top sheet 1A located on the skin contact side, a liquid-impervious back sheet 11 located on the skin non-contact side, and a liquid-absorbent core interposed between the sheets 1A and 11 12. The napkin 10 has a front region 13 and a rear region 15 in the vertical direction, and an intermediate region 14 located between the front and rear regions 13 and 15. In the napkin 10, the peripheral portions 17 and 18 of the front and back sheets 1 </ b> A and 11 extending outward in the circumferential direction from the peripheral edge 16 of the core 12 overlap each other, and the inner surfaces of the sheets 1 </ b> A and 11 are fixed to each other at the peripheral portions 17 and 18. Yes.
[0038]
The top sheet 1 </ b> A is composed of a hydrophilic fiber nonwoven fabric 2 and a plurality of hydrophilic filaments 3 positioned on the outer surface of the nonwoven fabric 2. The top sheet 1 </ b> A has one cotton body 5 formed from the free part 3 b of the filament 3. The cotton body 5 is located in the front and rear regions 13 and 15 and the intermediate region 14 of the napkin 10 and extends substantially in the center in the regions 13, 14 and 15. The cotton body 5 only needs to be formed in at least the intermediate region 14 among these regions 13, 14, and 15. An adhesive part 19 to which an adhesive is applied is formed on the outer surface of the back sheet 11. The adhesive portion 19 is covered and protected by the release sheet 20. The core 12 is fixed to the inner surface of at least one of the front and back sheets 1A and 11.
[0039]
In order to wear the napkin 10, the release sheet 20 is peeled off to expose the adhesive portion 19, the napkin 10 is attached to the inside of the shorts via the adhesive portion 19, and then the shorts are worn. When the shorts are worn, the cotton body 5 of the top sheet 1A comes into contact with the crotch portion of the wearer. In the napkin 10, a plurality of filaments 3 raised above the nonwoven fabric 2 form a cotton body 5, and the cotton body 5 has high compressibility and good flexibility, so that the topsheet 1A is formed only from the nonwoven fabric 2. Compared with the case where it is done, the touch of 1 A of surface sheets is good, and the wearing feeling of the napkin 10 improves.
[0040]
In the napkin 10, menstrual blood excreted therein penetrates into the cotton body 5. Menstrual blood is absorbed and held in the core 12 through the nonwoven fabric 2 from the cotton body 5. The napkin 10 has a cotton body 5 formed in the front and rear regions 13 and 15 and the intermediate region 14, and menstrual blood penetrates into the cotton body 5 due to the capillary phenomenon of the cotton body 5 and then reaches the nonwoven fabric 2. Compared with the case where is directly excreted on the outer surface of the nonwoven fabric 2, menstrual blood does not diffuse on the outer surface of the nonwoven fabric 2, and menstrual blood can be prevented from diffusing to the periphery of the napkin 10. The napkin 10 can prevent leakage of menstrual blood from the periphery.
[0041]
10 and 11 are a partially cutaway perspective view of the disposable diaper 30 using the topsheet 1B of FIG. 4 and a cross-sectional view taken along line XI-XI of FIG. 10, and FIG. 12 is XII-XII of FIG. FIG. In FIG. 10, the horizontal direction is indicated by an arrow L, the vertical direction is indicated by an arrow M, and the vertical direction is indicated by an arrow N. In addition, the inner surfaces of the front and back sheets 1B and 31 and the leak-proof sheet 40 are surfaces facing the core 32, and the outer surfaces of the sheets 1B, 31 and 40 are surfaces not facing the core 32.
[0042]
The diaper 30 is a liquid-permeable surface sheet 1B located on the skin contact side, a liquid-impermeable back sheet 31 located on the skin non-contact side, and a liquid-absorbing property interposed between the front and back sheets 1B and 31. The core 32 is comprised. The diaper 30 has a front waistline region 33 and a back waistline region 35 in the vertical direction, and a crotch region 34 positioned between the waistline regions 33, 35. The diaper 30 is an open type that connects the front and rear waist regions 33 and 35 when worn.
[0043]
The diaper 30 includes a pair of end flaps 38 that are positioned outside the both end edges 36 of the core 32 and extending in the lateral direction, and a pair of side flaps 39 that are positioned outside the side edges 37 of the core 32 and extend in the vertical direction. Have. In the crotch region 34, the side flaps 39 form an arc toward the inner side in the lateral direction of the diaper 30. The diaper 30 has a substantially hourglass shape in plan view. A pair of liquid-impervious leakproof sheets 40 extending in the vertical direction are attached to the side flaps 39.
[0044]
The top sheet 1 </ b> B is composed of a hydrophilic fiber nonwoven fabric 2 and a plurality of hydrophilic filaments 3 positioned on the outer surface of the nonwoven fabric 2. The topsheet 1B has three cotton bodies 5 formed from the free part 3b of the filament 3. The cotton bodies 5 are located in the front waistline region 33 of the diaper 30 and the front half of the crotch region 34, extend in the longitudinal direction of the regions 33, 34, and substantially parallel to the lateral direction of the regions 33, 34. Are lined up. The core 32 is fixed to the inner surface of at least one of the front and back sheets 1B and 31.
[0045]
The leak-proof sheet 40 is located outside the side edges 36 of the core 32 and extends in the vertical direction, the movable side 42 extending in the vertical direction with a standing orientation above the top sheet 1B, It has fixed both end portions 43 lying in the waist region 33, 35 and lying inward in the lateral direction of the diaper 30. A stretchable elastic member 44 extending in the vertical direction is attached above the movable portion 42 so as to be shrinkable. The elastic member 44 is fixed to the movable portion 42 while being covered by a part of the movable portion 42. When the diaper 30 bends in the vertical direction with the top sheet 1B inside, the elastic member 44 contracts, the movable part 42 of the leak-proof sheet 40 rises above the top sheet 1B, and the movable part 42 acts as a barrier against excrement. Form.
[0046]
The end flap 38 is formed from the end portions 45 and 46 of the front and back sheets 1B and 31 that extend from the end edge 36 of the core 32 outward in the vertical direction. In the end flap 38, the end portions 45 and 46 of the front and back sheets 1B and 31 overlap each other, and the inner surfaces of the sheets 1B and 31 are fixed to each other at the end portions 45 and 46. Both fixed end portions 43 of the leak-proof sheet 40 are fixed to the outer surface of the end portion 45 of the topsheet 1B. A belt-like elastic member 47 around the trunk extending in the lateral direction is attached to the end flap 38 so as to be shrinkable. The waist elastic member 47 is interposed between the front and back sheets 1B, 31 and is fixed to the inner surfaces of the sheets 1B, 31.
[0047]
The side flap 39 is formed by side portions 48 and 49 of the front and back sheets 1B and 31 that extend laterally outward from the side edge 37 of the core 32 and a fixed side portion 41 of the leak-proof sheet 40. In the side flap 39, the side portion 48 of the topsheet 1B slightly extends laterally outward from the side edge 37 of the core 32, and the side portion 49 of the backsheet 31 and the leakproof sheet further laterally outward from the side portion 48. 40 fixed side portions 41 extend. In the side flap 39, the side portions 48, 49 of the front and back sheets 1B, 31 and the fixed side portion 41 of the leak-proof sheet 40 overlap, and the sheets 1B, 31, 40 are fixed to each other at the side portions 41, 48, 49. ing. A plurality of leg-around elastic members 50 extending in the vertical direction are attached to the side flaps 39 so as to be shrinkable. The leg-around elastic member 50 is interposed between the side portion 49 of the back sheet 31 and the fixed side portion 41 of the leak-proof sheet 40, and is fixed to the inner surfaces of the sheets 31 and 40.
[0048]
A flexible tape fastener 51 made of a plastic film is attached to the side flap 39 in the rear waistline region 35. The tape fastener 51 has a fixed end 52 and a free end 53 extending in the lateral direction. The fixed end portion 52 is interposed between the side portion 49 of the back sheet 31 and the fixed side portion 41 of the leak-proof sheet 40, and is fixed to the inner surfaces of the sheets 31 and 40. An adhesive (not shown) is applied to the inner surface of the free end portion 53. The free end portion 53 is bent inward in the lateral direction, and is temporarily attached to the side portion 41 of the leak-proof sheet 40 through an adhesive so as to be peelable. A flexible target tape 54 that attaches and detachably attaches the free end 53 of the tape fastener 51 is attached to the front waistline region 33. The target tape 54 is formed of a plastic film and has a rectangular shape that is long in the lateral direction. The target tape 54 is fixed to the outer surface of the back sheet 31.
[0049]
In order to wear the diaper 30, the side flaps 39 in the rear waistline region 35 are overlapped on the outside of the side flaps 39 in the front waistline region 33, and the free end 53 of the tape fastener 51 is attached to the target tape 54 via an adhesive. The front waistline region 33 and the back waistline region 35 are connected to each other. The diaper 30 to which the front and rear waist regions 33 and 35 are connected is formed with a waist opening and a pair of leg openings (not shown) below the waist opening.
[0050]
When the diaper 30 is worn, the cotton body 5 of the topsheet 1B comes into contact with the crotch portion of the wearer. In the diaper 30, the filament 3 raised upward of the nonwoven fabric 2 forms the cotton body 5, and the cotton body 5 has high compressibility and good flexibility, so that the topsheet 1 </ b> B is formed only from the nonwoven fabric 2. Compared with the case, the touch of the topsheet 1B is good and the wearing feeling of the diaper 30 is improved.
[0051]
The urine excreted during wearing of the diaper 30 penetrates into the cotton body 5 by the capillary phenomenon of the cotton body 5, then permeates the nonwoven fabric 2 and is absorbed and held in the core 32. In the diaper 30, the bulk of the cotton body 5 gradually increases from the front waistline region 33 toward the crotch region 34, and the cotton body 5 located in the crotch region 34 can absorb a large amount of urine. In the diaper 30, the urine that has entered the cotton body 5 located in the front waistline region 33 quickly reaches the nonwoven fabric 2, while the urine is flowing in the longitudinal direction even if the urine tries to flow from the front waistline region 33 toward the crotch region 34. Can be prevented by the cotton body 5, and urine can be prevented from diffusing into the rear waistline region 35. Further, since three cotton bodies are arranged in the lateral direction in the diaper 30, even if urine tries to flow toward the side flaps 39, the lateral flow of urine is prevented by the cotton bodies 5, and the side flaps. Side leakage of urine from 39 can be prevented.
[0052]
For the back sheets 11 and 31 and the leak-proof sheet 40, a hydrophobic fiber nonwoven fabric, a breathable liquid-impervious plastic film, a composite nonwoven fabric laminated with two or more hydrophobic fiber nonwoven fabrics, a hydrophobic fiber nonwoven fabric and a breathable liquid-impervious property Any composite sheet laminated with a plastic film can be used. A composite nonwoven fabric (SM nonwoven fabric or SMS nonwoven fabric) obtained by laminating a fiber nonwoven fabric manufactured by the melt blown manufacturing method and a fiber nonwoven fabric manufactured by the spunbond manufacturing method can also be used for the back sheets 11 and 31 and the leak-proof sheet 40. .
[0053]
As the hydrophobic fiber non-woven fabric, those manufactured by each method of spunlace, needle punch, melt blown, thermal bond, spun bond, and chemical bond can be used. The hydrophobic fiber nonwoven fabric is preferably made of thermoplastic synthetic resin fibers that have been subjected to water repellent treatment, but the synthetic resin fibers may not be subjected to water repellent treatment. As a synthetic resin fiber which forms a hydrophobic fiber nonwoven fabric, the same thing as the surface sheet 2 can be used. The hydrophobic fiber nonwoven fabric may have elastic stretchability by being made from stretchable fibers obtained by melting and spinning a thermoplastic elastomer resin.
[0054]
Adherence between front and back sheets 1A, 1B, 11, 31; Adherence of cores 12 and 32 to sheets 1A, 1B, 11, 31; Adherence of leak-proof sheet 40 to sheets 1B and 31; Elasticity to sheets 1B, 31 and 40 For fixing the members 44, 47, and 50, an adhesive or a heat fusion technique such as ultrasonic bonding or hot press bonding can be used.
[0055]
As the adhesive, a hot-melt adhesive, an acrylic adhesive, or a rubber adhesive can be used. The adhesive is preferably applied to the front and back sheets 1A, 1B, 11, 31 and the leak-proof sheet 40 in any form of spiral, zigzag, dot, and stripe. When the adhesive is applied to the sheets 1A, 1B, 11, 31, and 40 in such a manner, the application area where the adhesive is applied to the sheets 1A, 1B, 11, 31, and 40 and the adhesive are not applied. A non-application area is formed, and the sheets 1A, 1B, 11, 31, and 40 are intermittently fixed to each other.
[0056]
The cores 12 and 32 are a mixture of fluff pulp and superabsorbent polymer particles or a mixture of fluff pulp, superabsorbent polymer particles and thermoplastic synthetic resin fibers, and are compressed to a predetermined thickness. The cores 12 and 32 are preferably encased in tissue paper in order to prevent the cores 12 and 32 from losing their shape and dropping off the polymer particles.
[0057]
The topsheets 1A and 1B are not particularly limited to disposable wearing articles that use the topsheets 1A and 1B. In addition to the sanitary napkin 10 and the open diaper 30 that connects the front and rear waist areas when worn, side flaps in the front and back waist areas Can be used also for a pants-type disposable diaper in which a waist opening and a pair of leg openings are formed, and can also be used for a disposable urine collection pad and a disposable breast milk pad.
[0058]
【The invention's effect】
According to the liquid-permeable surface sheet according to the present invention, the cotton body is formed from a plurality of filaments raised upward from the outer surface of the nonwoven fabric, and the cotton body has high compressibility and good flexibility. The touch of the sheet in contact with the skin can be improved. In this surface sheet, the cotton body freely deforms together with the nonwoven fabric, and the cotton body can follow the movement of the wearer. This surface sheet is suitable as a sheet material to be used for a worn article because it is arranged on the skin contact side of the disposable worn article to improve the wearing feeling of the article.
[0059]
The liquid-permeable surface sheet in which the free portions of the filaments are entangled with each other can further improve the compressibility and flexibility of the cotton body formed from the filaments. This surface sheet can strengthen the action of the capillary action of the cotton body, and can absorb a large amount of body fluid in the cotton body.
[0060]
The liquid-permeable surface sheet in which the free part of the filament is crimped can further improve the compressibility and flexibility of the cotton body formed from the filament. This surface sheet can strengthen the action of the capillary action of the cotton body, and can absorb a large amount of body fluid in the cotton body.
[0061]
The liquid-permeable surface sheet in which the bulk of the cotton body is different in the second direction suppresses the flow of body fluid on the bulky side of the cotton body, compared to the flow of body fluid on the bulky side of the cotton body. Therefore, the flow direction and flow amount of the body fluid can be adjusted through the cotton body.
[Brief description of the drawings]
FIG. 1 is a perspective view of a liquid-permeable surface sheet shown as an example.
FIG. 2 is an end view taken along the line II-II in FIG.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is a perspective view of a liquid-permeable surface sheet shown as another example.
FIG. 5 is an end view taken along line VV in FIG. 4;
6 is an end view taken along line VI-VI in FIG. 4;
7 is a partially cutaway perspective view of a sanitary napkin using the top sheet of FIG. 1. FIG.
8 is a cross-sectional view taken along line VIII-VIII in FIG.
9 is a cross-sectional view taken along line IX-IX in FIG.
10 is a partially broken perspective view of a disposable diaper using the top sheet of FIG. 4;
11 is a cross-sectional view taken along line XI-XI in FIG.
12 is a cross-sectional view taken along line XII-XII in FIG.
[Explanation of symbols]
1A Liquid-permeable surface sheet
1B Liquid-permeable surface sheet
2 Hydrophilic fiber nonwoven fabric (liquid-permeable base sheet)
3 Filament
3a Base end
3b Free part
4 Joining line
5 Cotton
10 Sanitary napkins (disposable wearing articles)
11 Disposable diapers (disposable wearing articles)

Claims (7)

It is composed of a liquid-permeable base sheet and a plurality of filaments positioned on the outer surface of the base sheet and extending in the first direction, and is disposed on the skin contact side of a disposable wearing article that absorbs and retains body fluid. In the liquid-permeable surface sheet,
The filaments form a group extending in the second direction substantially parallel to a second direction intersecting the first direction, and the group of filaments extends at least in the second direction continuously. A bulky cotton that is fixed to the base sheet via a single joining line, and the free portions of the filaments extending from the base sheet are raised upward from the outer surface of the base sheet with the joining line as a base point. The said surface sheet characterized by forming the body. The topsheet according to claim 1, wherein the free portions of the filaments are entangled with each other. The top sheet according to claim 1 or 2, wherein the free portion of the filament is crimped. In the said surface sheet, a difference is provided in the basic weight of the group of those filaments toward the said 2nd direction, The volume of the said cotton body differs toward the said 2nd direction. The surface sheet in any one. In the said surface sheet, the difference is provided in the length of the free part of those filaments toward the said 2nd direction, The volume of the said cotton body differs toward the said 2nd direction. 4. The surface sheet according to any one of the above. The basis weight of a group of the filaments is in the range of ^{20 to} 700 g / m2, the length of the free part of the filaments is in the range of 10 to 100 mm, and the fineness of the filaments is 1.2 to 20.0 dtex. The topsheet according to any one of claims 1 to 5, which is in the range. The top sheet according to any one of claims 1 to 6, wherein at least two cotton bodies are formed on an outer surface of the base sheet.

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