Two-ply resin capsule for mining roof bolting systems

A multi-compartment capsule having a longitudinally extending tubular inner compartment for containing a catalyst and a longitudinally extending tubular outer compartment around said inner compartment for containing a resin composition which, when mixed and reacted with said catalyst sets and becomes a hardened mass, said compartments being fromed by a two-ply film strip having at least one ply of thermoplastic material, said two-ply film strip having a first longitudinally extending portion in which said thermoplastic material is on one side of said strip and a second longitudinally extending portion in which said thermoplastic material is on the opposite side of said strip, said thermoplastic sides of said film strip being overlapped and welded to each other along a longitudinally extending edge, said two-ply strip material being folded back upon itself along an edge spaced from said longitudinally extending welded edge so that the thermoplastic side of said strip at said folded edge is in contact with and welded to the thermoplastic side of said strip and forms said longitudinally extending tubular inner compartment and said opposite edge of said two-ply strip being folded around said tubular inner compartment so that the thermoplastic side of said strip at said opposite edge is in contact with and welded to the thermoplastic side of said strip and forms said longitudinally extending tubular outer compartment.