US3718448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass fiber forming and coating process
Assignee: PPG Industries Inc
•
Filing: 1972-01-03
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Granted: 1973-02-27
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Expires: 1992-01-03
Abstract
Abstract Simultaneously forming a large number of continuous filament glass fibers from a single bushing, coating the individual glass fibers with an aqueous liquid coating material, combining the fibers into a plurality of strands and drying the coating on the fibers while the strands are spaced from each other. In the strand forming process, the individual coated glass fibers are brought together and held together in small, spaced groups of fibers and the small groups of the coated fibers are dried while in this spaced relation before they are collected on the forming tube.
Inventors
- 👤 W Drummond
- 👤 D Denniston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:34
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/12; C03C25/20; C03C25/24; C03C25/26; C03C25/27
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
137 words
A method of forming glass fibers suitable for use in reinforcing elastomers or resins, comprising pulling glass fibers from molten glass through orifices in a bushing, applying an aqueous coating of a material selected from the group consisting of heat curable elastomers and heat curable resins to the fibers while they are separated from each other and are being pulled, bringing the coated fibers together until said coating material causes said fibers to adhere to each other and provide a plurality of spaced apart fiber strands, removing at least a portion of the moisture from the fiber strands while the strands are spaced from each other and drying or at least partially curing said coating by passing the spaced apart strands through an oven, and grouping the fine fiber strands together after drying or partially curing them.
Claim 2
Dependent Claim
19 words
The method of claim 2 wherein the coating on the grouped strand is 5 to 20 percent by weight.
Claim 3
Independent Claim
227 words
A method of forming an article composed of a group of fiber glass strands coated with an at least partially cured coating of a material selected from the group consisting of heat curable elastomers and heat curable resins comprising withdrawing a plurality of glass fibers from a mass of molten glass, applying pulling forces to the fibers of each of a group of said glass fibers from a location spaced from saiD mass of molten glass so that the glass fibers of each group converge to form a strand at a location between said mass of molten glass and the location at which said pulling force is exerted, maintaining said strands in spaced relation, applying a coating of a material selected from the group consisting of heat curable elastomers and heat curable resins to said glass fibers before said groups of glass fibers converge until said coating material causes said fibers to adhere to each other and form strands, heating said coated strands while said strands are maintained in spaced relation to dry or at least partially cure said coating, moving a group of said strands along converging paths until said strands are in surface-to-surface contact so as to form a group of fiber glass strands coated with an at least partially cured coating of a said coating material and recovering said group of fiber glass strands.
Claim 4
Dependent Claim
10 words
A product produced according to the method of claim 2.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein the drying zones are in a single oven.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein two distinct ovens are used, one for each drying zone.
Claim 7
Dependent Claim
13 words
The method of claim 2 wherein the drying zone is a dielectric oven.
Claim 8
Dependent Claim
11 words
The method of claim 7 wherein the ovens are dielectric ovens.
Claim 9
Dependent Claim
24 words
The method of claim 5 wherein the coating in the grouped strand is between 5 to 20 percent by weight of the finished strand.
References Cited (Backward Citations)
US3158519A
Cited
US3428518A
Cited
US3425862A
Cited
US3619252A
Cited
US3494753A
Cited
US3620701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |