Annular gated mold for the injection molding of contact lenses

Details Annular gated mold for the injection molding of contact lenses Annular gated mold for the injection molding of contact lenses

1995-12-21

1999-07-27

Weber, Thomas R.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means between charger and mold to cut off flow of...

425562, 2643289, B29D 1100

Patent

active

059286822

ABSTRACT:
A method and apparatus for the manufacture of optical polymer contact lenses in a closed mold, where a mold cavity is created between a front curve insert and a back curve insert, the side walls of the mold cavity being formed by the inner wall of a movable annular gate collar, the collar being positioned in a retracted position during polymer dosing and then moved prior to polymer cure into an extended position to complete the mold cavity and to separate the polymer curing inside the mold cavity from any waste polymer outside of the mold cavity.

REFERENCES:
patent: 4407766 (1983-10-01), Haardt et al.
patent: 4569807 (1986-02-01), Boudet
patent: 4622089 (1986-11-01), Spector et al.
patent: 4836960 (1989-06-01), Spector et al.
patent: 5182065 (1993-01-01), Piotrowski et al.
patent: 5460497 (1995-10-01), Vismara
Plastics Processing, vol. 18, pp. 203-204, 1982.

Affiliated with

Also associated with

Rating

Annular gated mold for the injection molding of contact lenses does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Annular gated mold for the injection molding of contact lenses, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Annular gated mold for the injection molding of contact lenses will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-876132