US3811262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of asbestos yarns
Assignee: UNIROYAL HOLDING Inc WORLD HEADQUARTERS MIDDLEBURY CONNECTICUT 06749 A CORP OF NEW JERSEY
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Filing: 1971-10-29
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Granted: 1974-05-21
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Expires: 1991-10-29
Abstract
Abstract In the production of drafted lightweight, high strength asbestos yarn with good strength, uniformity and weaving properties, the occurrence of breaks during drafting and the resultant waste of materials, labor and time are minimized by incorporating an undrawn continuous filament yarn, made of a drawable synthetic polymeric fiber, in each narrow strand or sliver of blended asbestos and staple textile fibers formed from the web thereof emanating from the card and just prior to the entry of the strands into the rub apron system where each strand is compacted and formed into a roving. The filament yarn thus constitutes a base for the asbestos and textile fibers and, by virtue of its drawability, can stretch with the roving during the subsequent drafting thereof and hold the fibers together. The draw ratio of the filament yarn should be approximately the same as, and preferably is slightly greater than, the draft ratio of the asbestos fiber roving. This abstract is not to be taken as either a complete exposition or as a limitation of the present invention, however, the full nature and extent of the invention being discernible only by reference to and from the entire disclosure.
Inventors
- 👤 R Clarkson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:06
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/02; D02G3/16; D02G3/20
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
24 words
The method of claim 1, wherein the draw ratio of said filament yarn is approximately equal to the intended draft ratio of said roving.
Claim 2
Dependent Claim
14 words
The method of claim 2, wherein said draw ratio is at least about 2.
Claim 3
Dependent Claim
24 words
The method of claim 1, wherein the draw ratio of said filament yarn is slightly greater than the intended draft ratio of said roving.
Claim 4
Dependent Claim
14 words
The method of claim 4, wherein said draw ratio is at least about 2.
Claim 5
Dependent Claim
16 words
The method of claim 1, wherein said drawable synthetic polymeric fiber is nylon, polyester or polypropylene.
Claim 6
Dependent Claim
115 words
In the method of making asbestos yarn; the steps comprising feeding and laying an undrawn continuous filament yarn of a drawable synthetic polymeric fiber into an unrubbed strand of a carded blend of a major proportion of asbestos fibers and a minor proportion of relatively longer staple fibers of a natural or synthetic textile material, subjecting the fiber strand and filament yarn composite to a rubbing operation for compacting said composite to form a roving, and drafting said roving to form asbestos yarn, said filament yarn by virtue of its drawability constituting a base for said asbestos and textile fibers and serving to minimize the occurrence of breaks in said roving during the drafting thereof.
Claim 7
Dependent Claim
23 words
The method of claim 7, wherein the draw ratio of said filament yarn is approximately equal to the draft ratio of said roving.
Claim 8
Dependent Claim
14 words
The method of claim 8, wherein said draw ratio is at least about 2.
Claim 9
Dependent Claim
23 words
The method of claim 7, wherein the draw ratio of said filament yarn is slightly greater than the draft ratio of said roving.
Claim 10
Dependent Claim
14 words
The method of claim 10, wherein said draw ratio is at least about 2.
Claim 11
Dependent Claim
16 words
The method of claim 7, wherein said drawable synthetic polymeric fiber is nylon, polyester or polypropylene.
Claim 12
Dependent Claim
149 words
In the method of making asbestos yarn; the steps comprising carding a blend of a major proportion of asbestos fibers and a minor proportion of relatively longer staple fibers of a natural or synthetic textile material to form a web, dividing said web into a plurality of relatively narrower strands, advancing said strands toward respective rubbing stations, feeding and laying into each of said strands, prior to its entry into a rubbing station, a respective undrawn continuous filament yarn of a drawable synthetic polymeric fiber, thereafter subjecting each fiber strand and filament yarn composite to a rubbing operation for compacting each composite to form a respective roving, and drafting said rovings to form asbestos yarns, said filament yarns by virtue of their drawability constituting respective bases for the associated asbestos and textile fibers and serving to minimize the occurrence of breaks in the respective rovings during the drafting thereof.
Claim 13
Dependent Claim
16 words
The method of claim 13, wherein said drawable synthetic polymeric fiber is nylon, polyester or polypropylene.
Claim 14
Dependent Claim
29 words
The method of claim 13, further comprising the step of plying at least one additional yarn of natural or synthetic textile fiber material with each of said drafted rovings.
Claim 15
Dependent Claim
46 words
The method of claim 13, wherein the amount of said asbestos fibers used in said blend is predetermined to ensure that in each of said asbestos yarns said asbestos fibers constitute about 80 percent of the yarn by weight based on the weight of the yarn.
Claim 16
Dependent Claim
9 words
Asbestos yarn made by the process of claim 16.
Claim 17
Dependent Claim
20 words
The method of claim 13, wherein the draw ratio of each of said filament yarns is at least about 2.
Claim 18
Dependent Claim
19 words
The method of claim 18, wherein said draw ratio is slightly greater than the draft ratio of said rovings.
Claim 19
Dependent Claim
31 words
The method of claim 13, wherein the leading end region of each of said undrawn filament yarns is fed into its respective one of said strands by a pressurized air stream.
Claim 20
Dependent Claim
11 words
An asbestos fiber roving made by the process of claim 1.
Claim 21
Dependent Claim
9 words
Asbestos yarn made by the process of claim 7.
Claim 22
Dependent Claim
9 words
Asbestos yarn made by the process of claim 13.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |