Abstract: A multiple-cavity extrusion die for coextruding a plurality of indefinite lengths of multiple-layer tubular rubbery material. Core mandrels which extend into openings in the face of the die are adjustable for concentricity with respect to the die by internal or special external adjusting means. Cylindrically shaped core dies have frustro conically shaped forward portions which form extrusion dies with the cores for the core layer of rubbery material and form extrusion dies with a beveled back edge of an adjustable cylindrical cover die. Each of the cover dies is axially adjustable with respect to a respective core die to adjust the speed at which the individual tubes are extruded so that the speed of all tubes can be equalized. Special concentricity plates on the face of the covered dies are adjustably mounted with respect thereto so as to adjust the die openings for concentricity of the cover layer of rubbery material of each tube.

Abstract: A tube separator has two blocks with vertically and linearly aligned protrusions to which joined tubes are attached for separation into individual tubes. The protrusions are interdigitally arranged when the blocks are adjacent each other. A chain drive engages one block and pulls it from the other block which is locked in a fixed position. A guiding means maintains the blocks in an upright position. An ejecting means for separating the tubes from the protrusions engages the driven block and ejects the tubes from the protrusions. The fixed block is pushed by a driven block from a succeeding cycle and also engages the ejecting means for removing the tubes from the protrusions. The chain drive returns a block along the guide means so that an operator may reuse them with other tubes.