Plunger assembly system
The invention relates to a plunger for feeding encapsulating material to a mould cavity, comprising at least one peripheral groove recessed into the cylinder casing of the plunger whereby a material part is placed in the groove which only partly fills the groove. The invention also related to a device for encapsulating electronic components mounted on a carrier. In addition, the invention also relates to a method for sealing a fitting of a plunger housing, which plunger is adapted to feed encapsulating material under pressure to a mould cavity.
1. A plunger assembly system for feeding encapsulating material to a mold cavity, the plunger assembly comprising:
a cylindrical casing including a peripheral groove;
a material part disposed in the bottom of the groove; and
encapsulating material surrounding an outer periphery of the material part.
2. The plunger assembly system of claim 1 , wherein the material part is a flexible ring.
3. The plunger assembly system of claim 2 , wherein the ring is an O-ring.
4. The plunger assembly system of claim 1 , wherein the material part is annular.
5. The plunger assembly system of claim 1 , further including a channel in the cylindrical casing between the groove and an end surface of the cylindrical casing.
6. The plunger assembly system of claim 5 , wherein the channel is in an exterior surface of the cylindrical casing.
7. The plunger assembly system of claim 1 , wherein, in use of the plunger assembly, the encapsulating material is between the material part and a housing in which the cylindrical casing moves.
8. The plunger assembly system of claim 1 , wherein the material part is manufactured from a plastic.
9. The plunger assembly system of claim 1 , wherein the encapsulating material is partially situated in the groove.