Abstract: A in-line extrusion die is disclosed including a cylindrical mandrel and a die bushing surrounding the mandrel and forming therebetween a passageway leading to an extrusion orifice. The mandrel is mounted to one side of a spider plate and a tailcone is attached to the other side thereof. A die body containing a melt chamber surrounds the tailcone and forms a conical passageway therebetween. A thermocouple is mounted at the apex end of the tailcone for measuring the temperature of the melt as the melt flows from the melt chamber and through the conical passageway. The spider plate contains a plurality of openings which communicate with both passageways and allow the melt to pass through the plate and thence to the extrusion orifice.

Abstract: Apparatus designed to coat the internal surfaces of tubular structures, and particularly for coating small diameter tubular structures having porous walls with a controlled coating material which may be a polymer, for example. The arrangement includes structure for rotating the tube to be coated simultaneously with structure for moving a coating applicator apparatus longitudinally through the tube for imparting an evenly dispersed coating throughout the longitudinally extent thereof. The arrangement is such that the apparatus may, selectively, impart a water or other solvent spray against, the already formed coating for extraction of a solvent from the coating. The coating characteristics (i.e., uniformity, thickness and pattern) are controlled by the use of a sintered metal and/or porous applicator, together with a controlled pressurized source of coating material.