Basecurve mold designs to maintain HEMA ring/basecurve adhesion

Details Basecurve mold designs to maintain HEMA ring/basecurve adhesion Basecurve mold designs to maintain HEMA ring/basecurve adhesion

1998-03-09

1999-11-02

Mackey, James P.

Plastic article or earthenware shaping or treating: apparatus

With means to gather excess or rejected stock material

249117, 249160, 425808, B29D 1100

Patent

active

059758759

ABSTRACT:
Designs for basecurves are disclosed which are designed to promote adhesion of an excess polymer HEMA ring to the basecurve during a demolding operation such that the excess polymer HEMA ring is removed along with the basecurve during the demolding operation. The basecurve mold designs promote and maintain adhesion of an excess polymer HEMA ring to the basecurve in a process for molding cast contact lenses in mold assemblies, each comprising a frontcurve and a spaced basecurve, and wherein a molded lens is formed therebetween. In an embodiment of the invention, the annular area of the basecurve mold can be formed with an annular step which includes projecting teeth positioned therearound which project into the excess polymer HEMA ring.

REFERENCES:
patent: 5036971 (1991-08-01), Seden et al.
patent: 5158718 (1992-10-01), Thakrar et al.
patent: 5160749 (1992-11-01), Fogarty
patent: 5238388 (1993-08-01), Tsai
patent: 5252056 (1993-10-01), Horner et al.
patent: 5271875 (1993-12-01), Appleton et al.
patent: 5542978 (1996-08-01), Kindt-Larsen et al.
patent: 5882698 (1999-03-01), Su et al.

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