Design for Tranfer Molding. Design for Tranfer Molding. ryandias (Automotive) (OP) 15 Sep 10 13:24 I am a designer electronic systems, and have been asked to do some concepts for a "transfer molded" package. I am not that familiar with the constraints on such a process. Mainly can lead frames extend out vertically in the mold, or do they always have to be flat against the parting line?Anyone have experience with this field? or recommend resources?