improved orifice and steam introduction assembly to be discussed in detail hereinafter as the live process steam picks up the yarns 12 13 it hurls the yarns longitudinally with great force downwardly through the bore 42 toward the screen 44 at a centermost point of the concave portion of the screen the bulk of the steam passes through screen 42 while the composite yarn rebounds or bounces from the screen 44 instantaneously in a continuously moving strand like stream 21 flowing upwardly and to the left past a relatively thin side wall 50 within the adapter housing and into a lateral exit opening from the improved conveying and compacting means 68 the yarn 21 is deposited into the heating chamber 24 instead of steam other heated fluids under pressure may be used for example heated compressed air or nitrogen may be used as noted in fig1 the heating chamber 24 consists of an outer sleeve of insulation 70 which surrounds a steam chamber 72 which in turn encompasses an inner cylindrical yarn treating chamber 74 steam is circulated through chamber 72 to heat the wall about the yarn treating chamber 74 and consequently to heat the yarn contained within the chamber 74 the rebounded texturized yarn 21 falls into the yarn receiving chamber 74 in a condition substantially free of longitudinal tension as the yarn 21 is withdrawn from the cooling chamber 26 by the takeup mechanism the loose mass of yarn within the heating chamber 24 progresses downwardly through the heating chamber to.