Transfer apparatus and transfer method for particulate material

An apparatus for transferring a particulate material, in the form of a quantity of spherical semiconductor particles each having a surface on which a respective spherical semiconductor integrated circuit device including a circuit is to be formed, by means of a flow of a driving fluid through a transfer pipe having in its interior an inner wall surface and an axial mid-region, said apparatus comprising:

• (a) a first driving means for effecting a spiral flow of said driving fluid through said transfer pipe in the axial direction of the latter, and for thereby effecting an axial flow of said sperical semiconductor particles through said transfer pipe;
• (b) said first driving means including a nozzle curved surface portion fitted at a downstream region thereof to said transfer pipe to join with said inner wall surface of said transfer pipe, said nozzle curved surface portion having a curved surface whose diameter continuously increases in an upstream direction from its juncture with said inner wall surface of said transfer pipe;
• (c) an annular gap-forming member arranged relative to said nozzle curved surface portion so as to form a nozzle gap between said annular gap-forming member and said nozzle curved surface portion, said nozzle gap being in communication with both a source of said driving fluid and said interior of said transfer pipe;
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• (d) said nozzle gap enabling said driving fluid flowing through said nozzle gap to enter said transfer pipe in a manner resulting in said spiral flow of said driving fluid and to form, by Coanda effect, a buffer layer of said driving fluid adjacent said inner wall surface of said transfer pipe, and said buffer layer, by virtue of a pressure gradient produced in said driving fluid within said transfer pipe between said inner wall surface and said axial mid-region of said transfer pipe, maintaining said spherical semiconductor particles in movement along said axial mid-region of said transfer pipe and out of contact with said inner wall surface of said transfer pipe.