COEXTRUSION DESIGN FOR BALLISTIC STRUCTURES

摘要

Conventional multilayer coextrusion, lamination and biaxial stretching technology commonlyrnused to produce flexible and rigid packaging structures might also be used to produce oriented,rnmultilayer film structures incorporating ballistic resistant materials such as polycarbonate (PC),rnpoly(methyl methacrylate) (PMMA), and commercial ionomers such DuPont Surlyn~? to yieldrnmultifunctional ballistic films exhibiting self-healing closure of the impact zone followingrnprojectile impact. The combination of these processes and materials may offer a feasible andrneconomically attractive route to ballistic panel production. Processing considerations that mustrnbe addressed include coextrusion instability and orientation temperature incompatibility resultingrnfrom the diverse melt rheological and solid-state deformation properties of these resins. Thernprogress and results of ongoing research and development efforts to produce oriented, multilayerrnballistic panels utilizing conventional cast film coextrusion will be reviewed.