Method of manufacturing level vials

Details Method of manufacturing level vials Method of manufacturing level vials

1982-09-16

1984-03-13

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

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

Simultaneous severing and shaping, or severing while work...

264255, 2643288, 264334, B29D 2302

Patent

active

044366868

ABSTRACT:
A method for forming vials for levels wherein a barrel-shaped core is first molded from an opaque thermoplastic in a double-injection molding machine and has at least a pair of spaced annular ribs integral therewith. A transparent plastic vial is then molded about the core in the same machine. Thereafter, the core is removed, severing the ribs which remain in the vial body and serve as bubble indicia.

REFERENCES:
patent: 3311690 (1967-03-01), Fischer
patent: 3320344 (1967-05-01), Slipp
patent: 4130264 (1978-12-01), Schroer

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