Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1992-09-23
1994-12-06
Timm, Catherine
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264 22, 264156, 4251742, 4251748R, B29C 5904
Patent
active
053708300
ABSTRACT:
The application is directed toward a process for forming an electret filter medium. The process includes the steps of: (1) providing a thin film of a dielectric material; (2) placing the thin film on a pattern anvil having a pattern of raised areas wherein the height of the raised areas is greater than the thickness of the film; (3) conveying the film, while placed on the pattern anvil, through an area where a fluid selected from the group including one or more of water, mineral oil, a chlorinated hydrocarbon, ethylene glycol and a solution of 50 volume percent water and 50 volume percent 1 propanol is applied to the film; (4) subjecting the film to a sufficient amount of ultrasonic vibrations in the area where the fluid is applied to the film to microaperture the film with at least about 1,000 microapertures per square inch in a pattern generally the same as the pattern of raised areas on the pattern anvil and with each of the microapertures having an area ranging from about 10 to about 100,000 square micrometers; and (5) corona discharge treating the film to instill a positive charge of at least about 100 volts on one surface of the film and a negative charge of at least about 100 volts on the other surface of the film.
REFERENCES:
patent: Re33063 (1989-09-01), Obeda
patent: 1982587 (1934-11-01), Wilkins
patent: 2289177 (1942-07-01), Chandler
patent: 2533609 (1950-12-01), Nolan et al.
patent: 2740184 (1956-04-01), Thomas
patent: 3025585 (1962-03-01), Griswold
patent: 3097149 (1963-07-01), Lacroix
patent: 3155460 (1964-11-01), Mears
patent: 3253317 (1966-05-01), Such
patent: 3333032 (1967-07-01), Dickinson
patent: 3352769 (1967-11-01), Ruben
patent: 3400188 (1968-09-01), Olson
patent: 3451884 (1969-06-01), Anno et al.
patent: 3488240 (1970-01-01), Roberts
patent: 3571679 (1971-03-01), VanTurnhout
patent: 3575752 (1971-04-01), Carpenter
patent: 3594134 (1971-07-01), Russell et al.
patent: 3635609 (1972-01-01), Balamuth
patent: 3640786 (1972-02-01), Carpenter
patent: 3642967 (1972-02-01), Doll
patent: 3660186 (1972-05-01), Sager et al.
patent: 3683736 (1972-08-01), Loose
patent: 3713960 (1973-01-01), Cochran, II
patent: 3723754 (1973-03-01), Murayama et al.
patent: 3756880 (1973-09-01), Graczyk
patent: 3790652 (1974-02-01), Colijn et al.
patent: 3794174 (1974-02-01), Booman et al.
patent: 3814101 (1974-06-01), Kozak
patent: 3818522 (1974-06-01), Schuster
patent: 3832267 (1974-08-01), Chia-Seng Liu
patent: 3839525 (1974-10-01), Doll
patent: 3881489 (1975-05-01), Hartwell
patent: 3886941 (1975-06-01), Duane et al.
patent: 3929135 (1975-12-01), Thompson
patent: 3949127 (1976-04-01), Ostermeier et al.
patent: 3956450 (1976-05-01), Abe et al.
patent: 3963309 (1976-06-01), Schwab
patent: 3966519 (1976-06-01), Mitchell et al.
patent: 3989867 (1976-11-01), Sisson
patent: 3998916 (1976-12-01), Van Turnhout
patent: 4028033 (1977-06-01), Bryant
patent: 4105724 (1978-08-01), Talbot
patent: 4215682 (1980-08-01), Kubik et al.
patent: 4242392 (1980-12-01), Yackiw
patent: 4311542 (1982-01-01), Mueller et al.
patent: 4369219 (1983-01-01), Goepp et al.
patent: 4375718 (1983-03-01), Wadsworth et al.
patent: 4388422 (1983-06-01), Gerteisen et al.
patent: 4389211 (1983-06-01), Lenaghan
patent: 4406720 (1983-09-01), Wang et al.
patent: 4414045 (1983-11-01), Wang et al.
patent: 4414244 (1983-11-01), Timberlake et al.
patent: 4438167 (1984-03-01), Schwarz
patent: 4439475 (1984-03-01), Lang
patent: 4472328 (1984-09-01), Sugimoto et al.
patent: 4488928 (1984-12-01), Ali Kahn et al.
patent: 4588537 (1986-05-01), Klaase et al.
patent: 4592815 (1986-06-01), Nakao
patent: 4601868 (1986-07-01), Radel et al.
patent: 4605454 (1986-08-01), Sayovitz et al.
patent: 4609518 (1986-09-01), Curro et al.
patent: 4623438 (1986-11-01), Felton et al.
patent: 4629643 (1986-12-01), Curro et al.
patent: 4645500 (1987-02-01), Steer
patent: 4695422 (1987-09-01), Corro et al.
patent: 4731282 (1988-03-01), Tsukagoshi et al.
patent: 4735843 (1988-04-01), Noda
patent: 4747895 (1988-05-01), Wallerstein et al.
patent: 4775571 (1988-10-01), Mizuno et al.
patent: 4777073 (1988-10-01), Sheth
patent: 4778644 (1988-10-01), Curro et al.
patent: 4798604 (1989-01-01), Carter
patent: 4801379 (1989-01-01), Ehrsam et al.
patent: 4815714 (1989-03-01), Douglas
patent: 4842794 (1989-06-01), Hovis et al.
patent: 4895749 (1990-01-01), Rose
patent: 4898761 (1990-02-01), Dunaway et al.
patent: 4900317 (1990-02-01), Buell
patent: 4929319 (1990-05-01), Dinter et al.
patent: 4931343 (1990-06-01), Becker et al.
patent: 4944854 (1990-07-01), Felton et al.
patent: 4955164 (1990-09-01), Hashish et al.
patent: 4980215 (1990-12-01), Schonbrun
patent: 4995930 (1991-02-01), Merz et al.
patent: 5015521 (1991-05-01), Fujii et al.
patent: 5059454 (1991-10-01), Todd et al.
patent: 5098755 (1992-03-01), Tanquary et al.
patent: 5116662 (1992-05-01), Morman
patent: 5225018 (1993-07-01), Zeldin et al.
"Ultrasonics/High Power", Kirk-Othmer Encyclopedia of Chemical Technology, vol. 23, pp. 462-479, .COPYRGT.1983.
"Crop Control", Modern Plastics, May 1991, pp. 58-60.
Translation of Japanese Patent Application No. HEI3(1991)-260160.
"Recent Progress in Electret Research", Topics in Applied Physics, vol. 33, 2nd ed., 1987, pp. 383-431.
Electrets and Related Electrostatic Charge Storage Phenomena, .COPYRGT.1968 by The Electrochemical Society, Inc.
Sonochemistry: The Uses of Ultrasound in Chemistry, Mason, T. J., Royal Society of Chemistry, pp. 83, 85.
Cohen Bernard
Jameson Lee K.
Harps Joseph P.
Kimberly-Clark Corporation
Timm Catherine
LandOfFree
Hydrosonic process for forming electret filter media does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydrosonic process for forming electret filter media, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrosonic process for forming electret filter media will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-212646