Method and pellet for encapsulating lead frames
AssigneeFico B.V.
InventorJohannes Lambertus Martinus Dannenberg
Life of this patent
Estimating the term…
Abstract
A method and pellet for encapsulating lead frames. Prior to applying pressure to a pellet, a plastic foil is placed between the pellet and a plunger. The pellet has a body of encapsulating material (e.g. epoxy) and a plastic layer connected thereto. A device is described for manufacturing such a pellet.
Claims19
A method for encapsulating lead frames in a moulding apparatus having an aperture, a plurality of mould cavities defined by two mould halves extending in a longitudinal direction, a plunger, and an ejector, wherein the aperture is in flow communication with the plurality of mould cavities, comprising the steps of:
- providing an unsealed body of encapsulating material for receipt by the moulding apparatus, said unsealed body of encapsulating material having a plastic layer located on at least one surface of the body of encapsulating material, the plastic layer configured such that at least a portion of one surface of the body of encapsulating material is uncovered;
- placing the body of encapsulating material in the aperture in the moulding apparatus such that the at least one uncovered portion of one surface of the body of encapsulating material is in flow communication with the plurality of mould cavities;
- placing the lead frames in each of the plurality of mould cavities;
- exerting pressure on the body of encapsulating material with the plunger contacting the at least one surface having the plastic layer;
- supplying heat to the body of encapsulating material such that the encapsulating material becomes plastically deformable and transportable to the plurality of mould cavities of the moulding apparatus;
- and
- encapsulating the lead frames with the ecapsulating material such that a moulded lead frame is formed in each of the plurality of cavities.
A pellet for encapsulating lead frames for receipt by a moulding apparatus having an aperture and a plurality of mould cavities extending in a longitudinal direction, wherein the aperture is in flow communication with the plurality of mould cavities through at least one injection channel, comprising:
- an unsealed body of encapsulating material which by applying pressure and supplying heat in the moulding apparatus is plastically deformable;
- and
- a plastic layer located on at least one surface of the body of encapsulating material, the plastic layer configured such that at least one portion of a surface of the body of encapsulating material is uncovered, wherein the body of encapsulating material and the plastic layer are configured to be positioned within the aperture of the moulding apparatus such that the at least one uncovered surface of the body of encapsulating material is in flow communication with the plurality of mould cavities.
Dependencies are inferred from the claim text.