Patent ID: 8361373

Claim:
A method of molding a plurality of proppants comprising: providing an apparatus, said apparatus comprising: (a) a first member having a manifold for channeling a plastic fluid to a cavity block, said cavity block containing a plurality of semi-spherical cavities, a center gate that is fluidly communicated with a plurality of channel arrays radiating outward from said center gate, and wherein each plurality of channel arrays having a plurality of rows, and wherein each row has a pair of proppant gates that deliver said plastic fluid to said semi-spherical cavities; (b) a second member comprising: (i) a movable plate for engaging with said first member, said movable plate having an opening therein; (ii) a core block positioned within said opening, said core block containing a plurality of reciprocal semi-spherical cavities configured to engage the semi-spherical cavities of said cavity block so that a plurality of spheres are formed, said core block further containing a plurality of arm cavities that link said plurality of spheres, and wherein said plastic fluid within said plurality of arm cavities forms a star cluster and within said plurality of spheres forms the proppants; (c) an ejector plate assembly slidably disposed within said core block, said ejector plate assembly comprising: a first ejector plate; and a second ejector plate operatively attached to said first ejector plate; (d) a piston plate operatively attached to said ejector plate assembly for advancing and contracting said ejector plate assembly; (e) a plurality of first ejector pins disposed through said first ejector plate for ejecting said star cluster with said proppants from said core block, said plurality of first ejector pins operatively attached to said first ejector plate; and (f) a plurality of second ejector pins disposed through said second ejector plate for ejecting said proppants without said star cluster, said plurality of second ejector pins operatively attached to said second ejector plate; closing the first member and the second member; forming a plurality of spheres linked by said star cluster; injecting the fluid plastic into the center gate and through said channel array; injecting the fluid plastic into the proppant gates; forming the plurality of proppants linked to said star cluster.