Method of molding a thermoplastic ring onto a leadframe

Details Method of molding a thermoplastic ring onto a leadframe Method of molding a thermoplastic ring onto a leadframe

1991-06-27

1993-05-25

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

26427213, 26427215, 264277, 26432812, B29C 4512

Patent

active

052137481

ABSTRACT:
In a pre-molded package assembly, a thermoplastic ring molded onto a leadframe must maintain lead coplanarity. In this invention a plastic member of liquid crystal polmar is molded onto the leads of a metal leadframe. The plastic member is a thermoplastic anisotropic material which, when formed, has a flow direction which is in the long dimension of the plastic member and a transverse direction which is in the short dimension of the plastic member. Dam members on the leadframe help contain the plastic molding compound within the mold cavity during the molding process. A puddle gate prevents the formation of a weld line in the plastic member. Upon completion of the molding process, the dam members are excised from the leadframe to provide discrete leads.

REFERENCES:
patent: 3341647 (1967-09-01), Aberle
patent: 4632798 (1986-12-01), Eickman et al.
patent: 4778635 (1988-10-01), Hechtman et al.
patent: 4837184 (1989-06-01), Lin et al.
patent: 4859632 (1989-08-01), Lumbard
patent: 4873615 (1989-10-01), Grabbe

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