B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/104
B29D 11/00 (2006.01) B29C 39/42 (2006.01) B29C 43/02 (2006.01) B29C 43/36 (2006.01) B29C 43/56 (2006.01)
Patent
CA 1258561
ABSTRACT OF THE DISCLOSURE: Method of polymerization cast molding of articles, above all of lenses, from hydrophilic gels, and to an equipment for performing this method. The method of polymerization cast molding of articles from hydrophilic gels, in particular of lenses, consists in introducing of a hydrophobic liquid, which is virtually immiscible with a hydrophilic polymerization mixture, into a mold with hydrophobic surface followed by a dosed hydrophilic monomer mixture, which is allowed to polymerize, while the formed drop of the polymerizing monomer mixture is pressed into the mold with a punch having the chosen hydrophobic molding surface, whereas the polymerizing monomer mixture is maintained under the pressure of punch until the end of polymerization and the contingent overflow of the polymerizing monomer mixture and/or the hydrophobic liquid is allowed to escape between the mold and punch. The equip- ment for performing this method consists of a mold with the inner hydrophobic rotation-symmetrical surface and a punch, the hydrophobic molding surface of which is concave or convex, while an overflow space is formed between the mold and punch.
531163
Krcova Zuzana
Sulc Jiri
Vacik Jiri
Ceskoslovenska Akademie Ved
Robic Robic & Associes/associates
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