US3930098A — Method of molding fiber reinforced plastic flat p…

Claim 1

Independent Claim 166 words

A PROCESS FOR CONTINUOUSLY PREPARING A FIBER REINFORCED PLASTIC (FRP) FLAT PLATE HAVING NO WARPS, COMPRISING COVERING BOTH THE TOP AND BOTTOM SURFACE OF A CONTINUOUS RFP FLAT PLATE MOLDING MATERIAL WITH FILM-LIKE SHEETINGS; 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 B-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; 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; AND REMOVING THE FILM-LIKE SHEETINGS FROM THE CURRED FRP MOLDING MATERIAL.

Claim 2

Dependent Claim 166 words

A PROCESS FOR CONTINUOUSLY PREPARING A FIBER REINFORCED PLASTIC (FRP) FLAT PLATE HAVING NO WARPS, COMPRISING COVERING BOTH THE TOP AND BOTTOM SURFACE OF A CONTINUOUS RFP FLAT PLATE MOLDING MATERIAL WITH FILM-LIKE SHEETINGS; 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 B-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; 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; AND REMOVING THE FILM-LIKE SHEETINGS FROM THE CURRED FRP MOLDING MATERIAL.

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/mm2.

Claim 4

Dependent Claim 35 words

A process according to claim 1, in which said ionizing radiation comprises an electron 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 31 words

A process according to claim 1, 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 7

Dependent Claim 33 words

A process according to claim 1, in which the distance between the adjoining clips is gradually made larger as the FRP molding material covered with sheetings is transported nearer to the irradiation area.

Claim 8

Dependent Claim 17 words

A process according to claim 1, in which the widthwise tension is temporarily loosened after the irradiation.

Claim 9

Dependent Claim 24 words

A fiber reinforced plastic (FRP) flat plate having smooth surfaces and no warps, which is continnuously prepared according to the process of claim 1.

Claim 10

Dependent Claim 34 words

An FRP flat plate according to claim 8, 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 is.

Claim 11

Dependent Claim 167 words

A process for continuously preparing a fiber reinforced plastic (FRP) flat plate having no warps, comprising: covering both the top and bottom surface of a continuous FRP flat plate molding material with film-like sheetings; 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 Alpha -rays, Beta -rays X-rays, neutron beam or mixtures thereof, wherein the dose rate is about 102 -108 rad/hr with a total dose of about 105-107 rad; 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; and removing the film-like sheetings from the cured FRP molding material.

Claim 12

Dependent Claim 167 words

A process for continuously preparing a fiber reinforced plastic (FRP) flat plate having no warps, comprising: covering both the top and bottom surface of a continuous FRP flat plate molding material with film-like sheetings; 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 Alpha -rays, Beta -rays X-rays, neutron beam or mixtures thereof, wherein the dose rate is about 102 -108 rad/hr with a total dose of about 105-107 rad; 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; and removing the film-like sheetings from the cured FRP molding material.

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/mm2.

Claim 14

Dependent Claim 14 words

A process according to claim 10, in which heating is employed after the irradiation.

Claim 15

Dependent Claim 31 words

A process according to claim 10, 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 16

Dependent Claim 33 words

A process according to claim 10, in which the distance between the adjoining clips is gradually made larger as the FRP molding material covered with sheetings is transported nearer to the irradiation area.

Claim 17

Dependent Claim 18 words

A process in accordance with claim 10, in which the widthwise tension is temporarily loosened after the irradiation.

Claim 18

Dependent Claim 24 words

A fiber reinforced plastic (FRP) flat plate having smooth surfaces and no warps, which is continuously prepared according to the process of claim 10.

Claim 19

Dependent Claim 33 words

An FRP flat plate according to claim 16, 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.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-12-29	1979-06-30	1979-12-30	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-12-29	1983-06-30	1983-12-30	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-12-29	1987-06-30	1987-12-30	$7700.00	Window Closed / Lapsed

Method of molding fiber reinforced plastic flat plates

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