US3793108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Augmented curing of reinforced plastic stock
Assignee: Glastrusions Inc
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Filing: 1971-10-14
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Granted: 1974-02-19
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Expires: 1991-10-14
Abstract
Abstract A pultrusion machine and process wherein a composite fibre strand is pulled through successive stages of impregnation, curing, and forming. At the impregnation stage liquid thermosetting resin is mixed with hardener and the fiber strand saturated with the mixture and rough formed. During the initial curing stage a cure is started throughout the resin mixture by use of electrical wave energy. Before final curing, the saturated strand is pulled through the finish die where it is externally heated and wherein the saturated strand is given its final crosssectional shape and external finish, and cured to completion immediately prior to final emergence at the exit end of the finish die.
Inventors
- 👤 W Goldsworthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:16
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/50; B29C70/52; B29C70/525; B29C70/528; B29C35/00; B29C35/02; B29C35/0261; B29C35/08; B29C35/10; B29C35/12; B29C35/14; B29C48/00; B29C48/022; B29C48/03; B29C48/05; B29C48/12; B29C48/25; B29C48/88; B29C48/91; B29C70/527; C; C08; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/244; B29C35/0805; B29C2035/0855; B29C2035/0861; B29C2791/00; B29C2791/001; B29C48/09; B29K; B29K2101/00; B29K2101/10; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/10; B29K2105/101; B29K2301/00; B29K2301/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
195 words
A method for the augmented curing of stock consisting of a fiber strand impregnated with thermosetting resin comprising initially continuously mixing a synthetic thermo-setting liquid resin material with hardner material at a composing stage to form a catalyzed mixture, bringing together a mass of individual fiber elements into a composite strand and saturating said strand with said mixture, forming the saturated strand to a preselected cross-sectional shape and size, and passing the saturated strand to an initial curing stage subjecting said saturated strand in said initial curing stage to electrical wave energy of wave length productive of a condition in said resin at the interior of said strand whereby to initiate heat curing simultaneously at the innermost portion aNd throughout the entire cross-sectional area of said saturated strand, passing said saturated strand in curing condition out of the initial curing stage and directly to a final curing stage and there confining the saturated strand whereby to fix the condition for the surface and the cross-sectional shape of the strand in its final cross-sectional shape, size and finish, and keeping the saturated strand during said final curing stage out of the influence of electrical wave energy.
Claim 2
Independent Claim
195 words
A method for the augmented curing of stock consisting of a fiber strand impregnated with thermosetting resin comprising initially continuously mixing a synthetic thermo-setting liquid resin material with hardner material at a composing stage to form a catalyzed mixture, bringing together a mass of individual fiber elements into a composite strand and saturating said strand with said mixture, forming the saturated strand to a preselected cross-sectional shape and size, and passing the saturated strand to an initial curing stage subjecting said saturated strand in said initial curing stage to electrical wave energy of wave length productive of a condition in said resin at the interior of said strand whereby to initiate heat curing simultaneously at the innermost portion aNd throughout the entire cross-sectional area of said saturated strand, passing said saturated strand in curing condition out of the initial curing stage and directly to a final curing stage and there confining the saturated strand whereby to fix the condition for the surface and the cross-sectional shape of the strand in its final cross-sectional shape, size and finish, and keeping the saturated strand during said final curing stage out of the influence of electrical wave energy.
Claim 3
Dependent Claim
18 words
The method of claim 1 including heating the exterior of the saturated strand during the final curing stage.
Claim 4
Dependent Claim
31 words
The method of claim 1 including confining the saturated strand during said initial curing stage within a die of non-metallic material which is characterized as an extra low electrical loss material.
Claim 5
Dependent Claim
24 words
The method of claim 1 including confining the saturated strand during said final curing stage within a die of relatively high heat conducting metal.
Claim 6
Dependent Claim
24 words
The method of claim 1 including reforming the saturated strand to its final shape and finish during its passage through the final curing stage.
Claim 7
Dependent Claim
51 words
The method of claim 1 including confining the saturated strand during said initial curing stage within a die of non-metallic material which is characterized as an extra low, electrical loss material and also confining the saturated strand during said final curing stage within a die of relatively high heat conducting material.
Claim 8
Dependent Claim
22 words
The method of claim 1 wherein the electrical wave energy is at a radio frequency of from about 45 to 500 megahertz.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein the electrical wave energy is at a microwave frequency of between about 950 and 5,200 megahertz.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |