Patent AU8569282A successfully refreshed from Google Patents.
US4794034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water absorbing article
Assignee: Kao Corp
•
Filing: 1982-05-03
•
Granted: 1988-12-27
•
Expires: 2002-05-03
Abstract
Abstract A sanitary, liquid-absorbing article has as surface material a non-woven fabric comprising two layers integrated by a binder, the first layer having a basis weight of 5 to 15 g/m 2 , the second layer having a basis weight of 20 to 45 g/m 2 , wherein when the non-woven fabric is in the wet state, E=Kρ F a ; ρ FO ≦1.2×10 -2 g/cm 3 ; and K≧1.2×10 6 as defined in the following compression characteristic formula of the non-woven fabric: ##EQU1## wherein E is a Young's modulus (g/cm 2 ), P is a pressure (g/cm 2 ), ρ F is an apparent specific weight (g/cm 3 ) and ρ FO is a ρ F value when the pressure is 0 g/cm 2 .
Inventors
- 👤 Kazunori Nishizawa
- 👤 Osamu Ito
- 👤 Iwao Miyashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:52
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B32B5/02; B32B5/022; D; D06; D06M; D06M17/00; B32B2262/00; B32B2262/02; B32B2307/00; B32B2307/50; B32B2307/51; B32B2307/70; B32B2307/726; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/31
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
264 words
In a water-absorbing article including a water-permeable surface sheet, a water-impermeable backing sheet, and a water-absorbing layer disposed between said surface sheet and said backing sheet in face-to-face contact with both of said sheets, the improvement which comprises: said surface sheet comprises a surface layer and an elastic compressible layer, both of said layers consisting essentially of a non-woven fabric, said layers being joined together in face-to-face contact with each other by heat-fusible binder fibers, wherein the basis weight of said surface layer is in the range of 5 to 15 g/m 2 , and the basis weight of said elastic compressible layer is in the range of 20 to 45 g/m 2 , said elastic compressible layer being in face-to-face contact with said water-absorbing layer of said water-absorbing article, and when said surface sheet is in a wet state, the values of ρ FO and K in the compression characteristic formula: ##EQU4## wherein P is the pressure exerted on said surface sheet in g/cm 2 , ρ F is the apparent specific weight of said surface sheet in g/cm 3 not including the weight of water when said surface sheet is in a wet state, ρ FO is the ρ F value when the pressure exerted on said surface sheet is 0 g/cm 2 , and a and K are each a constant, are in the ranges of ρ FO ≦1.2×10 -2 g/cm 3 and K≧1.2×10 6 , under conditions wherein the relation E=Kρ F a is substantially established, wherein E is the Young's modulus for said surface sheet in g/cm 2 .
Claim 2
Dependent Claim
264 words
In a water-absorbing article including a water-permeable surface sheet, a water-impermeable backing sheet, and a water-absorbing layer disposed between said surface sheet and said backing sheet in face-to-face contact with both of said sheets, the improvement which comprises: said surface sheet comprises a surface layer and an elastic compressible layer, both of said layers consisting essentially of a non-woven fabric, said layers being joined together in face-to-face contact with each other by heat-fusible binder fibers, wherein the basis weight of said surface layer is in the range of 5 to 15 g/m 2 , and the basis weight of said elastic compressible layer is in the range of 20 to 45 g/m 2 , said elastic compressible layer being in face-to-face contact with said water-absorbing layer of said water-absorbing article, and when said surface sheet is in a wet state, the values of ρ FO and K in the compression characteristic formula: ##EQU4## wherein P is the pressure exerted on said surface sheet in g/cm 2 , ρ F is the apparent specific weight of said surface sheet in g/cm 3 not including the weight of water when said surface sheet is in a wet state, ρ FO is the ρ F value when the pressure exerted on said surface sheet is 0 g/cm 2 , and a and K are each a constant, are in the ranges of ρ FO ≦1.2×10 -2 g/cm 3 and K≧1.2×10 6 , under conditions wherein the relation E=Kρ F a is substantially established, wherein E is the Young's modulus for said surface sheet in g/cm 2 .
Claim 3
Dependent Claim
30 words
A water-absorbing article as claimed in claim 1, wherein said surface sheet has a tensile strength of at least 130 g/25 mm in the lateral direction of the non-woven fabric.
Claim 4
Dependent Claim
18 words
A water-absorbing article as claimed in claim 2, wherein said tensile strength is less than 250 g/25 mm.
Claim 5
Dependent Claim
46 words
A water-absorbing article as claimed in claim 1, wherein said heat-fusible binder fibers are incorporated into at least one of said layers, whereby said layers can be joined together by bringing said layers into face-to-face contact and applying heat sufficient to fuse said heat-fusible fibers thereto.
Claim 6
Dependent Claim
51 words
A water-absorbing article as claimed in claim 1, wherein said non-woven fabric consists essentially of synthetic fibers, at least 30% of said fibers in said elastic layer have a fineness of 6 deniers or more and said surface layer consisting essentially of fibers having a fineness of 3 deniers or less.
Claim 7
Dependent Claim
30 words
A water-absorbing article as claimed in claim 5, wherein said synthetic fibers are selected from the group consisting of heat-fusible, conjugated polyethylene and polypropylene fibers, polyester fibers and polypropylene fibers.
Claim 8
Dependent Claim
21 words
A water-absorbing article as claimed in claim 6, wherein said layers each consist essentially of said heat-fusible fibers and polyester fibers.
Claim 9
Dependent Claim
96 words
A water-absorbing article as claimed in claim 1, wherein the constants a and K are determined by plotting a curve comprising measured values for compressive force corresponding to selected different thickness values of said surface sheet, determining E values by measuring the slope of lines tangent to different points on said curve, plotting calculated E values versus corresponding ρ F values for said surface sheet logarithmically to obtain a straight line, and then determining a and K for said surface sheet from said straight line according to the equation log E=a log ρ F +log K.
Claim 10
Dependent Claim
127 words
A water-absorbing article as claimed in claim 1, wherein said surface layer consists essentially of heat-fusible binder fibers of conjugated polyethylene and polypropylene having a fineness of 3 denier and a length of 51 mm, said surface layer having a basis weight of 8 g/m 2 , said elastic compressible layer consists essentially of 30% of polyester fibers of 12 denier fineness and 51 mm length and 70% of said heat fusible fibers of 3 denier fineness and 51 mm length, said compressive elastic layer having a basis weight of 32 g/m 2 , both said layers being fusion bonded together by hot air and the finished surface sheet having a ρ FO value of 1.0×10 -2 g/cm 3 and a K value of 2.9×10 6 .
Claim 11
Dependent Claim
257 words
A water-permeable sheet adapted for use as a water-permeable surface sheet in a water-absorbing article, which article includes the water-permeable surface sheet, a water-impermeable backing sheet, and a water-absorbing layer disposed between said surface sheet and said backing sheet in face-to-face contact with both of said sheets, said water-permeable sheet comprising a first layer and a second elastic compressible layer, both of said layers consisting essentially of a non-woven fabric, said layers being joined together in face-to-face contact with each other by heat-fusible binder fibers, wherein the basis weight of said first layer is in the range of 5 to 15 g/m 2 , and the basis weight of said second layer is in the range of 20 to 45 g/m 2 , and when said water-permeable sheet is in a wet state, the values of ρ FO and K in the compression characteristic formula: ##EQU5## wherein P is the pressure exerted on said water-permeable sheet in g/cm 2 , ρ F is the apparent specific weight of said water-permeable sheet in g/cm 3 not including the weight of water when said surface sheet is in a wet state, ρ FO is the ρ F value when, the pressure exerted on said water-permeable sheet is 0 g/cm 2 , and a and K are each a constant, are in the range of ρ FO ≦1.2×10 -2 g/cm 3 and K≧1.2×10 6 , under conditions wherein the relation E=Kρ F a is substantially established, wherein E is the Young's modulus for said water-permeable sheet in g/cm 2 .
Claim 12
Dependent Claim
257 words
A water-permeable sheet adapted for use as a water-permeable surface sheet in a water-absorbing article, which article includes the water-permeable surface sheet, a water-impermeable backing sheet, and a water-absorbing layer disposed between said surface sheet and said backing sheet in face-to-face contact with both of said sheets, said water-permeable sheet comprising a first layer and a second elastic compressible layer, both of said layers consisting essentially of a non-woven fabric, said layers being joined together in face-to-face contact with each other by heat-fusible binder fibers, wherein the basis weight of said first layer is in the range of 5 to 15 g/m 2 , and the basis weight of said second layer is in the range of 20 to 45 g/m 2 , and when said water-permeable sheet is in a wet state, the values of ρ FO and K in the compression characteristic formula: ##EQU5## wherein P is the pressure exerted on said water-permeable sheet in g/cm 2 , ρ F is the apparent specific weight of said water-permeable sheet in g/cm 3 not including the weight of water when said surface sheet is in a wet state, ρ FO is the ρ F value when, the pressure exerted on said water-permeable sheet is 0 g/cm 2 , and a and K are each a constant, are in the range of ρ FO ≦1.2×10 -2 g/cm 3 and K≧1.2×10 6 , under conditions wherein the relation E=Kρ F a is substantially established, wherein E is the Young's modulus for said water-permeable sheet in g/cm 2 .
Claim 13
Dependent Claim
30 words
A water-permeable sheet as claimed in claim 10, wherein said water-permeable sheet has a tensile strength of at least 130 g/25 mm in the lateral direction of the non-woven fabric.
Claim 14
Dependent Claim
18 words
A water-permeable sheet as claimed in claim 11, wherein said tensile strength is less than 250 g/25 mm.
Claim 15
Dependent Claim
46 words
A water-permeable sheet as claimed in claim 11, wherein said heat-fusible binder fibers are incorporated into at least one of said layers, whereby said layers can be joined together by bringing said layers into face-to-face contact and applying heat sufficient to fuse said heat-fusible fibers thereto.
Claim 16
Dependent Claim
51 words
A water-permeable sheet as claimed in claim 10, wherein said non-woven fabric consists essentially of synthetic fibers, at least 30% of the fibers in said elastic layer have a fineness of 6 deniers or more and said surface layer consisting essentially of fibers having a fineness of 3 deniers or less.
Claim 17
Dependent Claim
30 words
A water-permeable sheet as claimed in claim 14, wherein said synthetic fibers are selected from the group consisting of heat-fusible, conjugated polyethylene and polypropylene fibers, polyester fibers and polypropylene fibers.
Claim 18
Dependent Claim
21 words
A water-permeable sheet as claimed in claim 15, wherein said layers each consist essentially of said heat-fusible fibers and polyester fibers.
Claim 19
Dependent Claim
91 words
A water-permeable sheet as claimed in claim 10, wherein the constants a and K are determined by plotting a curve comprising measured values for compressive force corresponding to selected different thickness values of said surface sheet, determining E values by measuring the slope of lines tangent to different points on said curve, plotting calculated E values versus corresponding ρ F values logarithmically to obtain a straight line, and then determining a and K for said surface sheet from said straight line according to the equation log E=a log ρ F+log K.
Claim 20
Dependent Claim
126 words
A water-absorbing article as claimed in claim 1, wherein said surface layer consists essentially of heat-fusible binder fibers of conjugated polyethylene and polypropylene having a fineness of 3 denier and length of 51 mm, said surface layer having a basis weight of 8 g/m 2 and said compressive elastic portion consists essentially of 40% of polyester fibers of 12 denier fineness and 51 mm length and 60% of said heat fusible fineness fibers of 3 denier fineness and 51 mm length, said compressive elastic portion having a basis weight of 32 g/m 2 , both said layers being fusion bonded together by hot air and the finished surface sheet having a FO value of 1.0×10 -2 g/cm 3 and a K value of 3.4×10 6 .
References Cited (Backward Citations)
US4102340A
Cited
US4077410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-27 | 1992-06-27 | 1992-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-27 | 1996-06-27 | 1996-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-27 | 2000-06-27 | 2000-12-27 | $7700.00 | Window Closed / Lapsed |