US4072792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber reinforced plastic flat plates
Assignee: Nitto Boseki Co Ltd
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Filing: 1975-06-25
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Granted: 1978-02-07
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Expires: 1995-06-25
Abstract
Abstract A fiber reinforced plastic (FRP) flat plate having no warps is continuously prepared by curing a continuous FRP plate molding material both top and back surfaces of which are covered with film-like sheetings by means of an ionizing radiation. In the process, the FRP molding material is continuously transported in lengthwise direction, and tensions are given to said film-like sheetings in both lengthwise and widthwise directions before and in the course of the irradiation.
Inventors
- 👤 Kunio Araki
- 👤 Takashi Sasaki
- 👤 Yuko Kasahara
- 👤 Yoshisada Yamashita
- 👤 Keiichi Yotumoto
- 👤 Hiromi Sunaga
- 👤 Kiyoshi Tabei
- 👤 Kazuo Goto
- 👤 Kunio Tajiri
- 👤 Hirokama Kittaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:17
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31518; Y10T428/31522; Y10T428/31551; Y10T428/31616; Y10T428/3162; Y10T428/31652; Y10T428/31678; Y10T428/31681; Y10T442/00; Y10T442/60; Y10T442/674
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
170 words
A process for continuously preparing a fiber reinforced plastic (FRP) flat plate having no warps, comprising: covering with film-like sheetings both the top and bottom surface of a continuous FRP flat plate molding material comprising a reinforcing fiber material impregnated with a liquid resin material curable by means of an ionizing radiation; continuously transporting the covered material in the lengthwise direction; irradiating the covered material as it is being transported by means of an ionizing radiation until said molding material is cured, said ionizing radiation being β-rays, electron beam, or mixtures thereof, wherein the dose rate is about 0.01-20 Mrad/sec with a total dose of about 0.1-50 Mrad; and applying tensions to the film-like sheeting covering the FRP molding material in both the lengthwise and the widthwise directions before and in the course of the irradiation, said tensions being in a degree sufficient to press and hold the molding material so as to maintain the thickness thereof uniform and the surfaces thereof smooth before and in the course of radiation.
Claim 2
Dependent Claim
170 words
A process for continuously preparing a fiber reinforced plastic (FRP) flat plate having no warps, comprising: covering with film-like sheetings both the top and bottom surface of a continuous FRP flat plate molding material comprising a reinforcing fiber material impregnated with a liquid resin material curable by means of an ionizing radiation; continuously transporting the covered material in the lengthwise direction; irradiating the covered material as it is being transported by means of an ionizing radiation until said molding material is cured, said ionizing radiation being β-rays, electron beam, or mixtures thereof, wherein the dose rate is about 0.01-20 Mrad/sec with a total dose of about 0.1-50 Mrad; and applying tensions to the film-like sheeting covering the FRP molding material in both the lengthwise and the widthwise directions before and in the course of the irradiation, said tensions being in a degree sufficient to press and hold the molding material so as to maintain the thickness thereof uniform and the surfaces thereof smooth before and in the course of radiation.
Claim 3
Dependent Claim
30 words
A process according to claim 1, in which the tensions to be applied to the film-like sheetings in both directions are in the range of about 1-20 Kg/mm 2 .
Claim 4
Dependent Claim
30 words
A process according to claim 1, in which said ionizing radiation comprises a beam employed at a dose rate of 0.01-20 Mrad/sec with a total dose of about 0.1-50 Mrad.
Claim 5
Dependent Claim
14 words
A process according to claim 1 in which heating is employed after the irradiation.
Claim 6
Dependent Claim
32 words
A process according to claim 1, in which the tension in the widthwise direction is gradually increased as the FRP molding material covered with sheetings is transported nearer to the irradiation area.
Claim 7
Dependent Claim
17 words
A process according to claim 1, in which the widthwise tension is temporarily loosened after the irradiation.
Claim 8
Dependent Claim
22 words
A fiber reinforced plastic (FRP) flat plate laminated with a film-like sheeting, which is prepared according to the process of claim 1.
Claim 9
Dependent Claim
32 words
An FRP laminate according to claim 7, in which the FRP plate molding material comprises a reinforcing fiber material impregnated with a liquid resin material curable by means of an ionizing radiation.
Claim 10
Dependent Claim
22 words
A fiber reinforced plastic (FRP) flat plate laminated with a film-like sheeting, which is prepared according to the process of claim 1.
Claim 11
Dependent Claim
178 words
A process for continuously preparing a fiber reinforced plastic (FRP) flat plate having no warps, comprising: covering with film-like sheetings both the top and bottom surface of a continuous FRP flat plate molding material comprising a reinforcing fiber material impregnated with a liquid resin material curable by means of an ionizing radiation; continuously transporting the covered material in the lengthwise direction; irradiating the covered material as it is being transported by means of an ionizing radiation until said molding material is cured, said ionizing radiation being α-rays, γ-rays, X-rays, neutron beam or mixtures thereof wherein the dose rate is about 10 2 -10 8 rad/hr with a total dose of about 10 5 -10 7 rad; and applying tensions to the film-like sheeting covering the FRP molding material in both the lengthwise and the widthwise directions before and in the course of the irradiation, said tensions being in a degree sufficient to press and hold the molding material so as to maintain the thickness thereof uniform and the surfaces thereof smooth before and in the course of radiation.
Claim 12
Dependent Claim
178 words
A process for continuously preparing a fiber reinforced plastic (FRP) flat plate having no warps, comprising: covering with film-like sheetings both the top and bottom surface of a continuous FRP flat plate molding material comprising a reinforcing fiber material impregnated with a liquid resin material curable by means of an ionizing radiation; continuously transporting the covered material in the lengthwise direction; irradiating the covered material as it is being transported by means of an ionizing radiation until said molding material is cured, said ionizing radiation being α-rays, γ-rays, X-rays, neutron beam or mixtures thereof wherein the dose rate is about 10 2 -10 8 rad/hr with a total dose of about 10 5 -10 7 rad; and applying tensions to the film-like sheeting covering the FRP molding material in both the lengthwise and the widthwise directions before and in the course of the irradiation, said tensions being in a degree sufficient to press and hold the molding material so as to maintain the thickness thereof uniform and the surfaces thereof smooth before and in the course of radiation.
Claim 13
Dependent Claim
30 words
A process according to claim 10, in which the tensions to be applied to the film-like sheetings in both directions are in the range of about 1-20 Kg/mm 2 .
Claim 14
Dependent Claim
14 words
A process according to Claim 10, in which heating is employed after the irradiation.
Claim 15
Dependent Claim
32 words
A process according to claim 10, in which the tension in the widthwise direction is gradually increased as the FRP molding material covered with sheetings is transported nearer to the irradiation area.
Claim 16
Dependent Claim
18 words
A process in accordance with claim 10, in which the widthwise tension is temporarily loosened after the irradiation.
Claim 17
Dependent Claim
22 words
A fiber reinforced plastic (FRP) flat plate laminated with a film-like sheeting, which is prepared according to the process of claim 10.
References Cited (Backward Citations)
US2865790A
Cited
US2956310A
Cited
US3383448A
Cited
US3339001A
Cited
US3592882A
Cited
US3801430A
Cited
US3600490A
Cited
US3717543A
Cited
US3810816A
Cited
US3930098A
Cited
US3867153A
Cited
US3958072A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |