Plastic article or earthenware shaping or treating: apparatus – Means applying electrical or wave energy directly to work – Radiated energy
Patent
1995-09-28
1997-10-21
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Means applying electrical or wave energy directly to work
Radiated energy
264 136, 264 23, 264 85, 425210, 425412, 425436R, 425806, 425808, B29C 3358
Patent
active
056793855
ABSTRACT:
An apparatus for causing the polymerized excess monomer to separate from a molded lens by increasing the surface energy of the flange area of one mold piece, causing the polymerized excess monomer to stick thereto. Specifically when manufactured under inert atmosphere conditions, a particular manifold is needed to supply an oxygen bearing gas, air, to the area to be treated while preventing the oxygen from contaminating the lens manufacturing area of the molds or diluting the nitrogen atmosphere of other lens process areas. It has been found that generation of the ionized oxygen by means of a corona treatment electrode sufficiently increases the adherence of the polymer to the mold piece so treated. In the preferred embodiment, the flange around the convex, male piece of the lens mold is corona treated so that when the mold pieces are separated after lens polymerization, the flashing of excess polymerized material surrounding the lens cavity adheres to that male, convex piece flange while the lens is removed with the female, concave piece.
REFERENCES:
patent: 3423488 (1969-01-01), Bowser
patent: 4468184 (1984-08-01), Rawlings
patent: 4609507 (1986-09-01), Wichterle et al.
patent: 5158718 (1992-10-01), Thakrar et al.
Wettermann, Robert P., Medical Device & Diagnostic Industry, "Electrical Surface Treatment of Medical Plastics", Oct., 1990.
Adams Jonathan Patrick
Heaton John C.
Rastrelli Edmund C.
Wagner Thomas John
Weber Kenneth John
Johnson & Johnson Vision Products Inc.
Leyson Joseph
Woo Jay H.
LandOfFree
Apparatus for treating an ophthalmic lens mold does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for treating an ophthalmic lens mold, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for treating an ophthalmic lens mold will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1004794