Apparatus for producing interlaced or entangled multifilament yarns

Apparatus for interlacing or entangling continuous multifilament synthetic yarn being fed along a feed path by impinging pressurized fluid jets on the yarn to produce repeating sections lengthwise of the yarn having a plurality of interlocking entanglements per inch occurring along the length of the treated yarn, the apparatus comprising an elongated housing to be positioned along the feed path for passage of the yarn with predetermined overfeed therethrough along a yarn feed axis, the housing being in the form of a unitary solid body having upstream and downstream ends and a bore extending longitudinally therebetween shaped to provide a larger diameter first bore section extending from said upstream end to an intermediate region between said ends and a smaller diameter second bore section extending to said downstream end through the remainder of the body, a jet nozzle member supported in said first bore section adjacent the upstream end by means permitting axial adjustment within said bore along the yarn feed axis, said jet nozzle member having a yarn feed passage extending therethrough for passage of the yarn and having a larger diameter cylindrical entrance head corresponding to the first bore section diameter joined to a smaller diameter axially elongated tubular cylindrical midportion joining a conically shaped nozzle head flaring outwardly in a downstream direction to said larger diameter at its downstream end, an axially elongated outlet tube member of tubular cylindrical configuration supported in said bore adjacent said downstream end and extending through said second bore section to a location adjacent said nozzle head for axial adjustment of the tube member relative thereto, said outwardly flaring conically shaped nozzle head having a central cavity opening through its downstream end shaped to provide a truncated conical cavity portion progressively enlarging toward and opening through its downstream end and a cylindrical cavity portion of larger diameter than the yarn feed passage serially arranged immediately upstream of the conical cavity portion extending upstream therefrom to the yarn feed passage, the cavity and the confronting portion of said tube member defining a turbulence chamber through which the yarn passes from said feed passage to the upstream end portion of said tube member, said heads at the opposite ends of said nozzle member and said midportion thereof defining an annular pressurized air chamber outwardly surrounding said midportion within said first bore section and said nozzle head having inclined air jet passage means between said pressurized air chamber and said turbulence chamber for producing pressurized fluid jet disturbances in the turbulence chamber causing both venturi and vortex action within the turbulence chamber to produce interlocking entanglement of filaments of the yarn a plurality of occurrences per inch, the center axis of each jet passage means being inclined at an angle to the yarn feed axis converging toward the downstream end of the housing and offset slightly sidewise of the yarn feed axis in nonintersecting relation therewith, and means supplying a pressurized fluid to said pressurized chamber surrounding the midportion of the nozzle member.