Method of making a plastic article having a plurality of tiny, t

Details Method of making a plastic article having a plurality of tiny, t Method of making a plastic article having a plurality of tiny, t

1990-01-29

1991-07-23

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Dividing work to form plural articles

264221, 264225, 264291, 264344, 264317, 264164, B29C 5102, B29C 5522

Patent

active

050341766

ABSTRACT:
The method of making a plastic article having a plurality of small openings which utilizes a plurality of thin plastic tubular members combined together in a side-by-side relationship forming an assemblage. Each tubular member has an exterior layer of a first plastic and a core of a second plastic. The second plastic is to be dissolvable by a solvent. This assemblage is passed through a furnace with the result that the assemblage is drawn into a thin filament. Once cooled, the thin filament is cut into segments of a desired length and these segments are placed within a solvent bath for a sufficient period of time in order to affect complete removal of the second type of plastic resulting in producing of a plurality of small, through openings within each section.

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"New Regulator Used for Intractable Glaucoma", Ophthalmology Times; vol. 15, No. 14, Jul. 15, 1990.

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