Method for encasing articles
AssigneeBoschman Holding B.V.
InventorBoschman Everardus Hendrikus
Life of this patent
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Abstract
A method for feeding plastic tablets to an installation for encasing articles such as ICs. The tablets (9) are fed horizontally in a direction perpendicular thereto when the divisible mold (2, 3) is open or closed. Feeding of the tablets takes place in a distribution channel (8). In this way, the amount of plastic can be metered more accurately and the diversity in pellet weights and dimensions can be dramatically reduced. A plunger (6) is lowered sufficiently to apply pressure against the tablets in the distribution channel (8), thereby distributing the plastic into the mold cavities (10).
Claims13
A method for encapsulating a lead frame connected to an integrated circuit, comprising the steps of:
- horizontally transporting a plastic tablet to a location above a distribution channel by supporting a bottom of the plastic tablet with a movable elongated spoon and pushing an end of the tablet with a pin to the location;
- dropping the tablet into the distribution channel;
- and
- urging plastic in the tablet to flow into a mold cavity of a mold connected to the distribution channel by vertically depressing an elongated plunger against the tablet, the mold cavity having a lead frame and defining a maximum size for an encapsulated lead frame.
An apparatus for encasing a lead frame connected to an integrated circuit, comprising:
- an upper mold defining an elongated opening and having a lateral opening;
- a lower mold defining a distribution channel below and extending parallel to said elongated opening, and defining a mold cavity in communication with said distribution channel;
- feed means designed to pass through the lateral opening for horizontally transporting at least one plastic tablet to a location above said elongated opening and said distribution channel, and for dropping the tablet into said distribution channel, the feed means comprising a movable elongated spoon supporting a bottom of the plastic tablet and a pin to push the tablet off the spoon;
- and
- plunger means for urging plastic in said tablet to flow from said distribution channel into said mold cavity.
Dependencies are inferred from the claim text.