Patent US4560385A successfully refreshed from Google Patents.
US4560385A
Expired / Lapsed
US
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Process for the treatment of non-woven sheets and the product obtained
Assignee: Freudenberg Performance Materials SAS
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Filing: 1984-05-21
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Granted: 1985-12-24
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Expires: 2004-05-21
Abstract
Abstract A process for the treatment of non-woven sheets made of synthetic textiles containing two constituents arranged side-by-side, one based on polyamide (polyhexamethyleneadipamide) and the other based on polyester (polyethylene glycol terephthalate), in which the following steps are carried out: (a) conversion to a sheet of the crimped textile having an overall linear density of less than 2 dtex, (b) optional needle bonding of the sheet, and (c) chemical treatment at low temperature in an aqueous solution of a swelling product for one of the constituents, permitting contraction and at least partial separation of the two constituents of the textile, the strands of which each then have a denier of less than 1 dtex. Swelling product: aqueous solution of formic acid at a concentration of 50% to 70%, preferably of between 55% and 65%, and at a temperature of between 5° C. and 40° C., preferably of between 18° C. and 25° C. The non-woven sheets obtained, having characteristics enabling them to be used in the majority of textile applications such as clothing, furnishing and the like.
Inventors
- 👤 Jean Baravian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:38
CPC Classifications
D; D04; D04H; D04H18/00; D04H1/00; D04H1/40; D04H1/42; D04H1/44; D04H1/46; D04H3/00; D04H3/005; D04H3/009; D04H3/011; D04H3/08; D04H3/10; D04H3/105; D04H3/14; D04H3/147; D04H5/00; D04H5/02; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
165 words
A process for producing spunbonded non-woven textile sheet of continuous filaments of polyester and continuous filaments of polyamides which comprises forming a spunbonded non-woven sheet of crimped continuous side-by-side polyester/polyamide filaments, said sheet having an overall linear density of less than 2 dtex; needle bonding the spunbonded non-woven sheet using needles of gauge 38 to 42 possessing 2 to 3 barbs per needle, said barbs each being smoothed on 2 to 3 edges so that the number of perforations is in the range of from 100 to 1500 perforations per square centimeter; contacting the needle bonded spunbonded sheet at a temperature of from 5° C. to 40° C. with an aqueous solution of a swelling agent consisting of formic acid at a concentration of from 50 to 70% whereby the sheet is contracted and the side-by-side filaments are at least partially separated into the continuous polyamide filaments and the continuous polyester filaments, each of said separated filaments having a denier of less than 1 dtex.
Claim 2
Dependent Claim
165 words
A process for producing spunbonded non-woven textile sheet of continuous filaments of polyester and continuous filaments of polyamides which comprises forming a spunbonded non-woven sheet of crimped continuous side-by-side polyester/polyamide filaments, said sheet having an overall linear density of less than 2 dtex; needle bonding the spunbonded non-woven sheet using needles of gauge 38 to 42 possessing 2 to 3 barbs per needle, said barbs each being smoothed on 2 to 3 edges so that the number of perforations is in the range of from 100 to 1500 perforations per square centimeter; contacting the needle bonded spunbonded sheet at a temperature of from 5° C. to 40° C. with an aqueous solution of a swelling agent consisting of formic acid at a concentration of from 50 to 70% whereby the sheet is contracted and the side-by-side filaments are at least partially separated into the continuous polyamide filaments and the continuous polyester filaments, each of said separated filaments having a denier of less than 1 dtex.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the needles are of gauge 40 to 42 and the number of perforations is between 400 and 800 per square centimeter.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the concentration of the formic acid is from 55 to 65%.
Claim 5
Dependent Claim
19 words
The process of claim 3 wherein the temperature in the contacting step is from about 18° to 25° C.
Claim 6
Dependent Claim
26 words
The process of claim 4 wherein the polyamide is a polycondensation product of hexamethylene diamine and adipic acid, and the polyester is a polyethylene glycol terephthalate.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein the polyamide is a polycondensation product of hexamethylene diamine and adipic acid, and the polyester is a polyethylene glycol terephthalate.
Claim 8
Dependent Claim
117 words
A needle bonded non-woven textile sheet comprising polyamide filaments and polyester filaments wherein said filaments have a denier of less than 1 dtex, said sheet weighing from 40 to 400 g/m 2 , having a tear strength of more than 25 g/m 2 , a flexular strength of from 300 to 2500 mg/cm of width, an abrasion resistance of more than 500 cycles, a residual deformation with time, under an elongation load of 5 daN, which is in a ratio of from 1 to 4, as compared to a needle-bonded sheet of the same weight, after mechanical fatigue of 50 cycles, and a zero residual deformation with time after simple elongation under a load of 5 daN.
Claim 9
Dependent Claim
117 words
A needle bonded non-woven textile sheet comprising polyamide filaments and polyester filaments wherein said filaments have a denier of less than 1 dtex, said sheet weighing from 40 to 400 g/m 2 , having a tear strength of more than 25 g/m 2 , a flexular strength of from 300 to 2500 mg/cm of width, an abrasion resistance of more than 500 cycles, a residual deformation with time, under an elongation load of 5 daN, which is in a ratio of from 1 to 4, as compared to a needle-bonded sheet of the same weight, after mechanical fatigue of 50 cycles, and a zero residual deformation with time after simple elongation under a load of 5 daN.
Claim 10
Dependent Claim
105 words
The non-woven sheet of claim 7 which is produced by needle bonding a non-woven sheet of crimped continuous side-by-side polyester/polyamide filaments and having an overall linear density of less than 2 dtex, with the number of perforations being in the range of from 100 to 1500 per square centimeter, and contacting the needle bonded sheet at a temperature of from 5° C. up to about 40° C. with an aqueous solution of formic acid in a concentration of 50 to 70% whereby the sheet is contracted and the side-by-side filaments are at least partially separated into the continuous polyamide filaments and the continuous polyester filaments.
Claim 11
Dependent Claim
37 words
The non-woven sheet of claim 8 wherein the non-woven sheet is needle bonded using needles of gauge 38 to 42 possessing 2 to 3 barbs per needle, said barbs each being smoothed on two to three edges.
Claim 12
Dependent Claim
27 words
The non-woven sheet of claim 7 wherein the polyamide is a polycondensation product of hexamethylene diamine and adiptic acid and the polyester is a polyethylene glycol terephthalate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |