Abstract: In a method of extruding a plastic product having a foamed core layer and at least one unfoamed skin layer by forcing contiguous flows of a resin through a coextrusion die, one of the flows containing a blowing agent and a nucleating agent for forming the core layer and the second of the flows containing only the blowing agent, for forming the skin layer, the steps of establishing a fluent stream of resin containing the blowing agent, dividing the stream into separate streams which are separately conducted to the coextrusion die to constitute the core-forming and skin-forming flows, respectively, and selectively adding the nucleating agent only to that one of the separate streams which constitutes the core-forming flow. The nucleating agent used can be one which is effectively completely expended when the core layer foams, so that the foamed product is essentially free of active nucleating agent.

Abstract: A process is provided for forming a plurality of objects simultaneously from a plurality of superimposed sheets of deformable and fusible material comprising the steps of heating said plurality of superimposed sheets until said material in said sheets reaches a temperature sufficient to allow plastic deformation while maintaining time, temperature and pressure conditions at the contiguous faces thereof below those causing fusion of said material and forming said plurality of superimposed sheets simultaneously.

Abstract: A process for conditioning ferruous particles with heat and a reducing atmosphere to reduce the oxygen content of the particles in a non-agglomerative manner and to make the conditioned particles readily pourable and free-flowing, and to process the particles into steel strip.

Abstract: A process for conditioning ferrous particles with heat and a reducing atmosphere to reduce the oxygen content of the particles in a non-agglomerative manner and to make the conditioned particles readily pourable and free-flowing, and to process the particles into steel strip.

Abstract: An apparatus for spreading a stream of particles onto a moving carrier. Uses a chute for containing and delivering particles; a screed bar, movable relative to the moving carrier to control the thickness of a layer of particles delivered from the chute to the carrier; and a pair of rotatable cylindrical doctor blades, substantially coaxial with each other and positioned at opposing ends of the screed bar to control the thickness of a layer of particles delivered from the chute to the carrier at opposing ends of the screed bar. The screed bar and the two doctor blades together control the thickness of the center and the two sides of a continuous stream of powder. Preferably the carrier is the bottom roller of a pair of compaction rollers which receive the stream of powder and compact it preparatory to sintering.