B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 45/14 (2006.01) B29C 45/16 (2006.01)
Patent
CA 2241509
This invention relates to a mold design, injection molding machine and a method for forming a multi-layer plastic article by over molding where the second layer of the article includes a portion having a different geometrical profile than the first one. The novel injection mold and injection molding machine for producing over-molded articles comprises an array of one or more cores which engage arrays of one or more first cavity and arrays of one or more composite cavities. Each composite cavity is formed from the combination of a second cavity and a cavity extension which carries at least a portion of the different geometrical profile, such as a thread. In one embodiment, the cavity extension comprises a pair of cavity portions which are mounted adjacent the core to laterally moveable slides on a movable plate, that can be a stripper plate. During molding of the first layer, the cavity extension elements are moved "out" of alignment with the first cavity and during molding of the second layer the cavity extension elements are moved "in" to form the composite cavity with the second cavity so that only the second layer replicates the geometrical profile of the composite cavity. In another embodiment of the invention, the cavity extension is a single element which is moved between a disengaged position wherein the core can be inserted into the first cavity and an engaged position wherein the core is inserted into the composite cavity.
Catoen Bruce
Gross Kevin
Hietkamp Doug
Mcginley Tom
Schad Robert
Husky Injection Molding Systems Ltd.
Torys Llp
LandOfFree
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