US4483727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High modulus polyethylene fiber bundles as reinforcement for brittle matrices
Assignee: Celanese Corp
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Filing: 1983-02-07
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Granted: 1984-11-20
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Expires: 2003-02-07
Abstract
Abstract A process for producing bundles of high modulus polyethylene fibers for reinforcement in composites wherein the matrix is a brittle material such as cement, concrete, plaster of Paris or the like. The process involves passing high modulus polyethylene yarn through high pressure nip rolls to deform the individual filaments and to form a loosely adhering unitary mass or bundle of filaments which is then chopped into short lengths for use as fibrous reinforcement in composites. In a preferred embodiment, the yarn is twisted prior to being passed through the nip rolls.
Inventors
- 👤 Nancy C. Eickman
- 👤 Walter Fabisiak
- 👤 Robert Dix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:19
CPC Classifications
D; D01; D01G; D01G1/00; D01G1/02; D01G1/04; D01F; D01F6/00; D01F6/02; D01F6/04; E; E04; E04C; E04C5/00; E04C5/07; B; B29; B29C; B29C43/00; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2105/00; B29K2105/06; Y; Y10; Y10S; Y10S83/00; Y10S83/913
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
79 words
A process for forming discrete, coherent bundles of high modulus polyethylene fibers comprising: (a) preparing highly oriented, multifilament yarn; (b) compressing the yarn to deform the individual filaments in cross-section whereby a loosely adhering unitary mass of individual filaments is formed wherein each filament substantially conforms to the deformed shape of the surrounding filaments; and (c) chopping the compressed yarn into bundles of appropriate lengths wherein there is at least partial fusion between the fiber ends during said chopping.
Claim 2
Dependent Claim
79 words
A process for forming discrete, coherent bundles of high modulus polyethylene fibers comprising: (a) preparing highly oriented, multifilament yarn; (b) compressing the yarn to deform the individual filaments in cross-section whereby a loosely adhering unitary mass of individual filaments is formed wherein each filament substantially conforms to the deformed shape of the surrounding filaments; and (c) chopping the compressed yarn into bundles of appropriate lengths wherein there is at least partial fusion between the fiber ends during said chopping.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the yarn is compressed by passing the yarn through a set of nip rolls.
Claim 4
Dependent Claim
23 words
The process of claim 2 wherein the pressure applied by the set of nip rolls is between about 10 and about 300 psi.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein the yarn is twisted prior to being compressed.
Claim 6
Dependent Claim
19 words
The process of claim 4 wherein the yarn is twisted between about one and about five turns per inch.
Claim 7
Dependent Claim
15 words
The process of claim 4 wherein the yarn is twisted about 2.5 turns per inch.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein the compressed yarn is chopped into bundles having a length between about 0.5 inch and about 2.5 inches.
Claim 9
Dependent Claim
26 words
The proces of claim 1 wherein the yarn comprises between about 200 and about 3,000 filaments of between about 0.5 and about 2 denier per filament.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein the monofilaments in the multifilament yarn are round or trilobal in cross section.
Claim 11
Dependent Claim
45 words
The process of claim 1 wherein the highly oriented, multifilament yarn is prepared by: (a) extruding a polymer melt to produce a substantially unoriented filament yarn, (b) cooling the yarn below its melting point; and (c) drawing the cooled yarn to obtain highly oriented filaments.
References Cited (Backward Citations)
US2830327A
Cited
US3050298A
Cited
US3086252A
Cited
US3362270A
Cited
US4058406A
Cited
US3492389A
Cited
US3962205A
Cited
US4158555A
Cited
US4261754A
Cited
US4297414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |