Disclosed is a removal unit for removing metallic alien materials, which
is adapted to remove metallic alien materials such as metal fragments contained
in powder or liquid raw materials. The removal unit includes an outer plate, an
inner plate spaced apart from the outer plate, and magnet members coupled between
the inner and outer plates. Each magnet member includes a cylindrical stainless
steel rod, a magnet received in the stainless steel rod to extend from one end
of the stainless steel rod to at least an intermediate portion of the stainless
steel rod, a non-magnetic piece received in the other end of the stainless steel
rod and coupled to the outer plate, and a fluorine resin coating formed over an
outer peripheral surface of the stainless steel rod. A removal member is arranged
to be slidable in a longitudinal direction along the magnet members while being
in contact with the outer peripheral surfaces of the magnet members.
