Abstract: A process for dielectrically heating and thermoforming a non-polar thermoplastic material by electromagnetic field energy is accomplished by the addition of a polar domain-containing material having at least one nitrile group to the thermoplastic material. Compositions comprising thermoplastic material and a polar domain containing material useful in this process are also described.

Abstract: Thermoplastic resin is converted to void free billets and preforms, by techniques including: compaction of heated thermoplastic powders: compactionof heated extruded strands: rolling of heated ingots of plastic: simultaneous extrusion and combining of two or more groups of strands: coextrusion of two or more resin formulations: sequential compaction of dual powders: extrusion with differentially heated dies. The billets may be non-homogeneous in response to dielectric heating, to produce controlled temperature zones within the heated polymers, when used as billets and preforms.

Abstract: A heat sealable plastic bag for retaining articles in a sterile atmosphere and which includes gussets and a flap in a remote location such that when the bag is opened by pulling open the flap, the bag opening and its contents are protected by the flap from contaminating contact with the flap exterior and/or the user to insure a continued completely sterile atmosphere for the bag opening and its contents.