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US 3,947,175 AGranted
Apparatus for injection molding of bodies with a core and skin of different materials
AssigneeSiemag Siegener Maschinenbau GmbH
InventorRobert Albert Melcher
Life of this patent
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Abstract
Injection molding apparatus for discontinuous fabrication of molded bodies consisting of a plurality of layers with a foaming core and an outer skin of non-foaming thermoplastic material, the apparatus consisting of an injection head connected to two extruders and equipped with a centrally-located jet surrounded by a ring jet.
Claims6
Injection molding apparatus for the injection molding of bodies consisting of several layers, including a foamed thermoplastic core and a non-foamed thermoplastic skin, by injecting foaming and non-foaming thermoplastic material into a hollow molding tool, comprising:
- a. an injection head having an axial first bore,
- b. a first injection cylinder adapted to deliver a foaming thermoplastic material,
- c. a second injection cylinder adapted to deliver foaming thermoplastic material,
- d. a ring jet closing sleeve axially movable within the first bore and having a second axial bore,
- e. a closure needle axially movable within the second bore,
- f. a ring jet formed by the injection head and the closing sleeve,
- g. a central jet formed by the closing sleeve and the closure needle,
- h. a first conduit adapted to carry material from one of the cylinders to the ring jet, and
- i. a second conduit adapted to carry material from the other of the cylinders to the central jet.
6 more elements
Dependencies are inferred from the claim text.