Abstract: A screen for separating and classifying smaller particles from larger particles of a particulate substance wherein the screen is of a planar configuration and made from a slab of synthetic material. The screen includes a plurality of spaced perforations formed by cutting the slab with a pressurized stream of fluid, which method of forming produces perforations of highly uniform configuration and dimensions, particularly when the slab is a composite comprising plural layers of different synthetic materials. The perforations are configured to compensate for foreshortening of their top openings and accelerated wear tendencies during use of the screen in an inclined disposition.

Abstract: Filamentary shaped bodies, such as strands, fibers, ribbons and the like, are formed by extruding an extensible high solids forming mix through an orifice and thereafter stretch casting the mix under the force of gravity through zones of controlled environment to form a continuous filamentary body which may thereafter be separated into discrete fibers or collected in its continuous form. The preferred high solids constituent include those metallic compounds capable of undergoing reduction so that shaped bodies made therefrom may be reduced and sintered into metallic filamentary articles.