B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 45/16 (2006.01) B29C 45/14 (2006.01) B29C 45/26 (2006.01)
Patent
CA 2517940
Disclosed is an injection molding method for manufacturing plastic parts from thermoplastically processible plastic molding materials with at least one exposed part (1) and at least one functional part (10), whereby the plastic molding material for the exposed part (1) comprises a transparent or translucent matrix with added effect pigments, and whereby the functional parts (10) can exhibit different physical and/or chemical plastic properties to the exposed parts (I). The injection molding method comprises the following steps: a) injection molding and solidification of the plastic molding material of the at least one exposed part (1) with an exposed surface (2) and a core surface (3) facing away from the latter in a first mold (20) with a First cavity (21); b) opening of the first mold (20) along a parting line or plane (24); c) closing of a second mold (25) with the at least one exposed part (1) in a second cavity (28); d) injection molding and solidification of the plastic molding material of the functional part (10) on the core surface (3) of the at least one exposed part (1); and e) opening of the second mold (25) and removal of the part. The injection molding method according to the invention is characterized in that for each exposed part (1) - to prevent irregularities such as flow marks and/or knit lines - a single injection nozzle (5) positioned to optimize the flow or at feast two injection nozzles in a cascaded injection molding method are used, and that the plastic molding material for the exposed part (i) comprises at least one transparent polymer. The corresponding plastic parts manufactured by injection molding exhibit an exposed surface (2) and a core surface (3) facing away from the latter with at least one injection point (6), whereby the functional part (10) of the plastic part is injection molded onto the core surface (3) of the previously solidified exposed part (1).
Hala Ralf
Kaisser Michael
Ems-Chemie Ag
Robic
LandOfFree
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