sumino Precision Extrusion Casting Forming: Plastic particles are plasticized by screws and extruded in a linear shape from the flat die mouth. After stretching, they attach to the surface of flexible substrates such as paper, film, non-woven fabric, and woven fabric. They are cooled, shaped, and pressed to form composite materials that combine the barrier and heat sealing properties of the plastic film layer, as well as the strength, toughness, and functional characteristics of the substrate.