(57) The filaments of a false twisted multifilament textile yarn (14) are intermingled
to increase their cohesion, and the residual torque in the yarn (14) is reduced, by
forwarding the yarn (14) along a yarn path (11) through a duct (2, 13) in a nozzle
body (10, 12), and directing a fluid flow (8, 9, 18) into the duct (2) transversely
of the yarn path (11) with the yarn path (11) centrally disposed relative to the fluid
flow (8, 9, 18) to intermingle the filaments and simultaneously directing the fluid
flow (8, 9) to swirl around the yam path (11) to reduce the residual torque. This
is achieved by directing two fluid flows (8,9) in opposed, overlapping directions
but offset relative to each other, or by directing the fluid flow (18) towards a base
surface (17) of the duct (13) which is planar and inclined laterally of the duct (13)
out of the perpendicular (21) to the direction (20) of fluid flow (18). A yarn threading
slot (6, 22) extends longitudinally of the body (10, 12) and communicates with the
duct (2, 13) and the exterior of the body (10, 12). The slot (6, 22) has a curved
profile between the duct (2, 13) and an enlarged inlet (3, 24) at the exterior of
the body (10, 12).
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