Molding machine and method

Details Molding machine and method Molding machine and method

1993-10-01

1995-03-07

Nguyen, Khanh

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

Opposed registering coacting female molds

249 90, 249 93, 249 95, 26427217, 425117, 425DIG228, B29C 4502, B29C 4514

Patent

active

053952260

ABSTRACT:
A molding machine includes a mold composed of lower and upper mold sections. A recess is defined in the lower mold section to receive a lead frame or other objects. The lead frame is sandwiched between the upper and lower mold sections. A mold cavity is defined in the lower mold section below the recess so as to receive a thermosetting resin or encapsulant. A gasket groove is defined adjacent to the mold cavity to receive a gasket. The gasket is subject to plastic deformation upon application of force. An oil chamber is communicated with the gasket groove and contains hydraulic oil. The hydraulic oil is pressurized to urge the gasket against the lead frame. As a result, the gasket is so deformed as to closely contact the surface of the lead frame and seal the mold cavity. The hydraulic oil is preferably mixed with thermoplastic resin in powder form.

REFERENCES:
patent: 4470786 (1984-09-01), Sano et al.
patent: 4952135 (1990-08-01), Douglas
patent: 4954307 (1990-09-01), Yokoyama
patent: 5118271 (1992-06-01), Baird
patent: 5151276 (1992-09-01), Sato et al.
patent: 5336272 (1994-08-01), Tsutsumi et al.

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