US4131502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of laminating adhesive to a plurality of spaced fiber strips
Assignee: BASF Corp
•
Filing: 1977-10-26
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Granted: 1978-12-26
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Expires: 1997-10-26
Abstract
Abstract Ribbons of unidirectional fiber-reinforced plastics material are prepared by laying the unidirectional fibers in parallel strips, alternating with strips of another material, onto a plastics material which is on a backing sheet, applying a second backing sheet to the upper surface, which sheet may also be coated with plastics material, applying heat and pressure, and removing one sheet of release material together with the said alternating strips of another material. The unidirectional ribbons left on the backing sheet are suitable for filament winding operations.
Inventors
- 👤 Panchanan Mitra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:50
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/02; B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/20; D04H3/04; Y; Y10; Y10T; Y10T156/00; Y10T156/11; Y10T156/1153
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
165 words
A method of preparing ribbons of unidirectional fiber-reinforced plastics material comprising the steps of i) laying, alternately, unidirectional fibers in a series of discrete parallel strips and a series of auxiliary strips onto a plastics material on a backing comprising a first continuous release sheet, wherein the auxiliary strips are different from said unidirectional fiber strips and serve to prevent the spreading of said unidirectional fiber strips and adhere to surplus resin between the unidirectional fiber strips, ii) applying to the unidirectional fibers and auxiliary strips a second continuous release sheet, iii) applying heat and pressure such that the plastics material flows about the unidirectional fibers to form a series of coherent ribbons, iv) removing only one of the release sheets, and v) removing the auxiliary strips from between the ribbons of unidirectional fiber-reinforced plastics material with the surplus plastics material adhering thereto without cutting the backing release sheet to form a release sheet with a plurality of spaced resin impregnated unidirectional fiber strips thereon.
Claim 2
Independent Claim
165 words
A method of preparing ribbons of unidirectional fiber-reinforced plastics material comprising the steps of i) laying, alternately, unidirectional fibers in a series of discrete parallel strips and a series of auxiliary strips onto a plastics material on a backing comprising a first continuous release sheet, wherein the auxiliary strips are different from said unidirectional fiber strips and serve to prevent the spreading of said unidirectional fiber strips and adhere to surplus resin between the unidirectional fiber strips, ii) applying to the unidirectional fibers and auxiliary strips a second continuous release sheet, iii) applying heat and pressure such that the plastics material flows about the unidirectional fibers to form a series of coherent ribbons, iv) removing only one of the release sheets, and v) removing the auxiliary strips from between the ribbons of unidirectional fiber-reinforced plastics material with the surplus plastics material adhering thereto without cutting the backing release sheet to form a release sheet with a plurality of spaced resin impregnated unidirectional fiber strips thereon.
Claim 3
Dependent Claim
28 words
The method according to claim 1, in which the second continuous release sheet is coated on the side which contacts the fibers and auxiliary strips with plastics material.
Claim 4
Dependent Claim
13 words
The method according to claim 1, in which the plastics material is thermosettable.
Claim 5
Dependent Claim
15 words
The method according to claim 1, in which the plastics material is a thermoplastics material.
Claim 6
Dependent Claim
17 words
The method according to claim 3, in which the thermosettable plastics material also comprises a thermoplastics material.
Claim 7
Dependent Claim
18 words
The method according to claim 3, in which the thermosettable material is an epoxide resin or a resole.
Claim 8
Dependent Claim
14 words
The method according to claim 4, in which the thermoplastics material is a polysulfone.
Claim 9
Dependent Claim
63 words
The method according to claim 5, in which the plastics material comprises a mixture of a resole and a poly(vinyl acetal) or a nylon, a novolac and a neoprene rubber or an acrylonitrile rubber, or an epoxide resin and a phenoxy resin, or a copolymer of an α-olefin hydrocarbon with an α-olefin which is an ester of a carboxylic acid, or a polysulfone.
Claim 10
Dependent Claim
29 words
The method according to claim 1, in which the first and second continuous sheets of release material are of polyethylene, polypropylene, or of paper treated with a release agent.
Claim 11
Dependent Claim
31 words
The method according to claim 1, in which the auxiliary strips are woven tapes of cotton or synthetic fiber, continuous glass fiber rovings, or vegetable or synthetic fiber string or cord.
Claim 12
Dependent Claim
21 words
The method according to claim 1, in which the auxiliary strips are of natural or synthetic rubber or of thermoplastics materials.
Claim 13
Dependent Claim
19 words
The method according to claim 1, in which the unidirectional fibers are of carbon, glass, or an aromatic polyamide.
Claim 14
Dependent Claim
25 words
The method according to claim 1, in which each strip of unidirectional fibers comprises one to ten tows, each tow comprising 1000 to 20,000 fibers.
Claim 15
Dependent Claim
27 words
The method according to claim 1, in which a pressure of 150 to 1000 kPa is applied to the strips of unidirectional fibers and the auxiliary strips.
Claim 16
Dependent Claim
27 words
The method according to claim 1, in which the strips of unidirectional fibers and the auxiliary strips are heated to a temperature of 50° to 180° C.
References Cited (Backward Citations)
US2954815A
Cited
US3475264A
Cited
US3660197A
Cited
GB1257482A
Cited
US3784433A
Cited
US3700511A
Cited
US3737352A
Cited
US3783068A
Cited
US3862287A
Cited
US3755060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |