Method and apparatus for producing a flash free pipette

Details Method and apparatus for producing a flash free pipette Method and apparatus for producing a flash free pipette

1985-10-10

1987-03-03

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

249 64, 249141, 249145, 425577, 425468, 425DIG224, B29C 4534

Patent

active

046474196

ABSTRACT:
An apparatus and method for molding plastic pipettes are disclosed, using an upper and lower mold plate that define a cavity which forms the outer surface of the pipette. The mold parting line of the upper and lower mold plates is located at a position between the ends of the cavity to prevent "radial" flash at the aperture of the pipette. "Axial" flash at the aperture of the pipette is prevented by a lower core pin in the lower mold plate. The lower core pin extends into the cavity and defines the dimensions of the aperture of the pipette. The extension of the lower core pin from the lower mold plate minimizes tool wear at the aperture and makes the alignment of the upper and lower mold plates at the orifice less critical.

REFERENCES:
patent: 4126291 (1978-11-01), Gilbert et al.
patent: 4165062 (1979-08-01), Mitchell
patent: 4287155 (1981-09-01), Tersteeg et al.
patent: 4340390 (1982-07-01), Collins et al.

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