IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0597869
(1984-04-09)
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발명자
/ 주소 |
- Cannady, Jr., Daniel L.
- Berg, Gilbert G.
- Leschek, Walter C.
- Meier, Joseph F.
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출원인 / 주소 |
- Westinghouse Electric Corp.
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대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
10 인용 특허 :
1 |
초록
▼
A method of impregnating a flexible, porous cellulosic sheet material involves passing the sheet through a low viscosity resin and across the resonant vibrating surface and through a cavitated zone in close proximity to at least one completely immersed ultrasonic wave generator, operating at a frequ
A method of impregnating a flexible, porous cellulosic sheet material involves passing the sheet through a low viscosity resin and across the resonant vibrating surface and through a cavitated zone in close proximity to at least one completely immersed ultrasonic wave generator, operating at a frequency and radiated power level effective to provide a combination vibratory pressure on the resin and cavitation effect causing degassing and heating of the resin, followed by passing the impregnated sheet through a drying means.
대표청구항
▼
1. A method of impregnating a flexible, porous, thick, high basis weight, cellulosic sheet material comprising the steps: (1) continuously passing a flexible, porous cellulosic sheet material, having a basis weight of over about 150 lbs./3,000 sq. ft. and a thickness of over about 10 mils, at a r
1. A method of impregnating a flexible, porous, thick, high basis weight, cellulosic sheet material comprising the steps: (1) continuously passing a flexible, porous cellulosic sheet material, having a basis weight of over about 150 lbs./3,000 sq. ft. and a thickness of over about 10 mils, at a rate of speed of from about 350 feet/minute to about 800 feet/minute, through a bath of liquid, organic, "B"-stageable impregnating resin, having a viscosity of from about 10 cps. to about 750 cps. at 25° C., and through a cavitated zone in close proximity to the resonant vibrating surface of at least one ultrasonic wave generator, said cellulosic sheet material passing from about 1/4 inch to about 6 inches away from the surface of the ultrasonic wave generator, where a differential length of the cellulosic sheet has a dwell time in the resin bath of from about 0.2 second to about 1 second, said ultrasonic wave generator being completely immersed in the resin and operating at a frequency of over about 10,000 Hz and at a radiated power level effective to provide a combination vibratory pressure on the resin molecules, and cavitation effect causing degassing and microstreaming of the resin, and heating of the resin within the cavitated zone along the width of the passing sheet, said heating causing a lowering of the resin viscosity, said combination of vibratory pressure and cavitation degassing and microstreaming effect causing resin impregnation throughout the void volume of the cellulosic sheet; and (2) passing the resin impregnated sheet through a drying means to "B"-stage the resin. 2. The method of claim 1, wherein, as an initial step, the porous sheet material is passed over a contacting roller means containing the bath impregnating resin to provide an initial resin wetting of the sheet, and where the ultrasonic wave generator operates at a frequency of from about 10,000 Hz to about 35,000 Hz. 3. The method of claim 1, where the cavitation effect within the cavitated zone in step (1), causes formation and bursting of bubbles filled with vapor trapped in the liquid resin, causing heating, and where the resonant vibrating surface of the ultrasonic wave generator is disposed along a substantial portion of the width of at least one side of the passing sheet. 4. The method of claim 1, where the sheet passes between ultrasonic wave generators. 5. The method of claim 1, where the sheet passes between an ultrasonic wave generator and an ultrasonic wave reflector plate. 6. The method of claim 1, where the porous sheet material is selected from the group consisting of Kraft paper, cotton linters paper, and alpha-cellulose paper, the sheet material has a basis weight of from about 150 lbs./3,000 sq. ft. to about 200 lbs./3,000 sq. ft., the resin is selected from the group consisting of phenolic resin, melamine resin, epoxy resin and polyester resin, the ultrasonic wave generator operates at a frequency of from about 10,000 Hz to about 35,000 Hz, after step (1) the impregnated sheet is passed through a means to remove excess resin from the sheet surface, and where the travel rate of speed of the sheet is from about 500 feet/minute to about 800 feet/minute.
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