Feeder is a term from giessereitechnik and the outdated name for risers.
A feeder is to avoid the piping in a cast part and has different tasks in a mold:
The form of feeders is usually cylindrical and from the mold led out, rare spherical and as Blindspeiser (feeder is completely hidden of the plastic material).
The cylinders and/or spherical shape due to the good to very good volumes/surfaces relationship (characteristic number for speed of solidification) is selected.
"Feeder variants": Isolating feeder, exotherm feeder: By isolation, and/or additional the feeder after the casting procedure, the feeder dimensions heat can be kept smaller, which leads to a material saving.
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