MOLD SEPARATION METHOD AND APPARATUS

An apparatus for separating individual contact lens mold assemblies. Each of the assemblies has a contact lens mold between a front curve half and a back curve mold half. Each of the mold halves have annular circumferential flanges. The apparatus applies steam at a first temperature to the back curv...

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Bibliographische Detailangaben
Hauptverfasser:	BEATON, STEPHEN ROBERT, PEGRAM, STEPHEN CRAIG, WALKER, CRAIG WILLIAM, KINDT-LARSEN, TURE, MARTIN, WALLACE ANTHONY
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CONTACT LENSES INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES OPTICS PERFORMING OPERATIONS PHYSICS PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SPECTACLES SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	An apparatus for separating individual contact lens mold assemblies. Each of the assemblies has a contact lens mold between a front curve half and a back curve mold half. Each of the mold halves have annular circumferential flanges. The apparatus applies steam at a first temperature to the back curve mold half to form a temperature gradient between the back mold half relative to the front curve mold half, wherein the temperature gradient ranges from about 2.5 C to 6.0 C. The demolding is effected by a prying element inserted between the circular circumferential flanges of each of the front mold and back mold halves of the contact lens mold assembly. The prying device includes a first set of pry fingers for retaining the front curve mold half and a second set of pry fingers for biasing the back curve mold half upwardly at a predetermined force with respect to the front curve hold half to effectively remove the back mold half therefrom.