Abstract: A thin ribbon of paint film is guided and applied directly to hot thermoplastics extrudate just as it exits the extrusion die by a film curving and guide plate and then by a film application wheel that is adjusted so that the film mates with and is laminated to the extrudate with an adhesive bond between the paint film substrate and the extrudate. This eliminates the need for high gloss, high metallic content thermoplastics for use as extrudate such as currently used for finished automotive side molding and allows reground thermoplastics to be used as the extrudate and finished with a paint film covering. The thermoplastic extrusion molding is then compression formed in a preform operation to establish end corners with selected radii for corner sharpness as well as reshape the part cross section. This is accomplished with a die and end cap construction which can be relatively adjusted to provide effective gas venting around the end of the die cavity on die closure.

Abstract: Dry, compactable radioactive waste material having a low specific activity and comprised approximately of eighty-five percent plastic material and fifteen percent non-plastic material is shredded and granulated. The granulated material is supplied under heat and pressure to an extruder which will extrude the waste material in plasticized form into a drum for disposal. Radioactive ion exchange resin beads may also be dewatered and mixed in predetermined amounts with the dry granulated material for encapsulation within the plasticized waste for disposal. The plasticized waste material, with or without the resin, is horizontally extruded into a horizontally disposed drum between a compacting disk secured to the extruder barrel and the bottom of the drum. Controlled pressure is applied against the bottom of the drum whereby the plasticized material will completely fill the space between the disk and the bottom of the drum and gradually push the drum bottom away from the sik as the drum is filled.

Abstract: A process and apparatus for producing plastic-bound propellant powders and explosives in crystalline form, with the apparatus including an extruder comprising a casing with a feed opening, optionally a solvent supply opening and one or two extruder shafts with kneading and conveying segments. For processing the plastic binders, which polymerize photochemically or under X-rays, a casing section transparent for the rays is provided, with polymerization within the extruder being initiated by UV/VIS or X-radiation sources arranged around it and the radiation intensity and/or the wavelength of the radiation are controlled as a function of the pressure difference over a given path in a compression zone of the extruder, in such a manner that the propellant or explosive strand or strands leave the extruder in a dimensionally stable and cuttable manner.

Abstract: A system for molding elongated ribbon-like products from thermoplastic materials utilizing a plurality of molds which are moved in tandem along a production line. As the molds are moved along the line at successive stations they are, while open, thermally adjusted to a temperature suitable for forming the product to be molded and then a ribbon of plastic is deposited in them. They are then closed and cooled and reopened and the molded product removed. The system utilizes only enough molding pressure to assure distribution of the plastic to all parts of the mold cavity and shaping of the molded product to the geometric design of the mold. The system includes a transfer means for the molds which returns the emptied molds for recycling through the molding process.

Abstract: A system is disclosed for the production of double-walled helically wound thermoplastic pipe. The apparatus includes an endless former (10) of the axially advancing and rotating type for forming a band of thermoplastic material (24) into a corrugated outer wall (26). An internal extruding device (28) extends along the core of the former and extrudes a second band (34) of thermoplastic material onto the interior of the outer wall. A cold shoe (36) presses the inner wall against the outer wall to form a smooth inner wall (42) of the double-walled pipe. It is also possible to provide for the insertion of a reinforcing profile in the corrugations of the outer wall.

Abstract: A process is provided for extruding and cross-linking olefin polymers, diolefin polymers and copolymers thereof with other olefins, diolefins, or monomers copolymerizable therewith, using as the cross-linking agent an azo compound of the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are alkyl having from one to about six carbon atoms.The process is of particular application in the production of cross-linked pipe of such polymers and copolymers.

Abstract: This injection blow molding machine has special provision for maintaining the plastic of a parison on a core rod at the orientation temperature of the plastic; and stretching the plastic of the parison lengthwise of the core rod for orientation in the direction of one axis without any substantial increase in the diameter of the parison. After this orientation in one axis, the temperature is controlled to maintain an orientation temperature, and the plastic of the parison is then blown to a larger diameter so as to obtain orientation in another axis for bi-axial orientation. The core rod is covered by an elastic balloon, and provision is made for obtaining flow of the plastic on the core rod lengthwise of the rod during the first orientation operation.