US4243446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a luffa composite
Assignee: Allibert Exploitation SA
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Filing: 1978-12-08
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Granted: 1981-01-06
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Expires: 1998-12-08
Abstract
Abstract Luffas are subject to disintegration into fibers which are carded and needled to a textile support. The resulting product is impregnated with a synthetic resin, dried and calendared to produce a foil from which, for example, inner soles can be cut or stamped.
Inventors
- 👤 Jean M. Mathey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:05
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/70; D04H1/74; D04H1/40; D04H1/42; D04H1/425; D04H1/4258; D04H1/4374; D04H1/4382; D04H1/43835; D04H1/44; D04H1/46; D04H1/48; D04H1/488; D04H1/498; D04H1/58; D04H1/64; D04H1/645; D04H13/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
150 words
A method of forming a composite material of high absorbency and cushioning effect, comprising the steps of: (a) disintegrating luffa sponges to form fibers therefrom; (b) carding the fibers resulting from step (a); (c) needling said fibers to a textile support of a nonwoven fabric to form a web; (d) impregnating the needled web produced in step (c) with a mixture of thermoplastic and thermosetting synthetic resins; (e) drying the resin-impregnated web formed in step (d); and (f) calendaring the dried impregnated web to form a foil, the luffas being lubricated with an aqueous solution containing a lubricant prior to disintegration such that the fibers of the luffas prior to its disintegration absorb between 5 and 15% of their weight of water to at least partially swell the fibers, the luffa fibers formed by disintegration being mixed with substantially lighter fibers and the fiber mixture being carded in step (b).
Claim 2
Independent Claim
150 words
A method of forming a composite material of high absorbency and cushioning effect, comprising the steps of: (a) disintegrating luffa sponges to form fibers therefrom; (b) carding the fibers resulting from step (a); (c) needling said fibers to a textile support of a nonwoven fabric to form a web; (d) impregnating the needled web produced in step (c) with a mixture of thermoplastic and thermosetting synthetic resins; (e) drying the resin-impregnated web formed in step (d); and (f) calendaring the dried impregnated web to form a foil, the luffas being lubricated with an aqueous solution containing a lubricant prior to disintegration such that the fibers of the luffas prior to its disintegration absorb between 5 and 15% of their weight of water to at least partially swell the fibers, the luffa fibers formed by disintegration being mixed with substantially lighter fibers and the fiber mixture being carded in step (b).
Claim 3
Dependent Claim
18 words
The method defined in claim 1, further comprising the step of: (g) cutting inner soles from said foil.
Claim 4
Dependent Claim
23 words
The method defined in claim 1 wherein the impregnation is carried out by immersing the web in a bath of the synthetic resin.
Claim 5
Dependent Claim
26 words
The method defined in claim 1 wherein said web is impregnated with said resin by inverse coating and a fabric layer is applied to said web.
Claim 6
Dependent Claim
33 words
The method defined in claim 1 wherein the carding is carried out by air carding with deposition of the lighter fibers on said textile support and the loofah fibers on the lighter fibers.
Claim 7
Dependent Claim
13 words
The method defined in claim 1 wherein the lighter fibers are viscose fibers.
Claim 8
Dependent Claim
52 words
The method defined in claim 1 wherein the fiber mixture contains about 90% luffa fibers and 10% viscose fibers, the needling density is about 50 to 70 needles/cm 2 and the impregnated web prior to calendaring has a thickness of 4 to 4.5 mm and after calendaring between 2.5 and 3 mm.
Claim 9
Dependent Claim
27 words
A web reconstituted from luffa fibers and made by the method of claim 1, claim 2, claim 3, claim 4, claim 5, claim 6 or claim 7.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |