of an enlarged portion of the nozzle rod remains in contact with the splines during complete operation cycle application_number US 58939975 A description the nozzle and nozzle assembly of the present invention were developed following a recognition of the cause of the splash or splay marks in molded articles of dense foam the design to be described provided for operation of a nozzle rod in a nozzle so designed that there is no surface on the nozzle rod in which material can deposit in the vicinity of the nozzle which can be scraped by the nozzle rod support means in the nozzle considering the drawing the invention will be more fully described an exterior view of the nozzle rod assembly appears in fig1 shown therein is the mounting block 10 the nozzle extension 11 and the nozzle 12 the parts having threaded connecting means similar numbers are used in the subsequent figures for like parts wherein these parts are shown in greater detail in fig2 a longitudinal sectional view of the assembly of fig1 the structure is shown in detail with the nozzle rod 16 in the forward or closed position at the rear of mounting block 10 there is provided a guide block 22 which is held in position by a plurality of set.