Device having yarn passage of specified dimensions for interlacing filaments of multifilament yarn

An improved apparatus for commingling multifilament yarn comprising an elongated body having

• a straight yarn passageway passing through said elongated body, said yarn passageway having an effective diameter of from about 1/4 inch to 5/16 inches;
• at least three orifices substantially equally spaced about the periphery of said body at substantially the same level, said orifices having a diameter of from about 0.060 inches to 0.080 inches;
• at least two of said orifices having an extended centerline offset to one side from the radius of a circle of the effective diameter of a cross section of said yarn passageway at the orifice level and at least one of said orifices centerlines offset in a direction counter to the said other offset orifices, and so that none of said extended centerlines intersect the center of said effective diameter also provided that the intersection of the extended centerlines forms a polygon which must have a side nearer to the center of said effective diameter than an apex, also provided that the polygon side must measure greater than 0.1 percent but less than 7.5 percent of the effective diameter, and said side must be at a distance greater than 0.1 percent but less than 5.0 percent of the effective diameter from the center of said effective diameter;
• said orifices communicating with a source of high pressure fluid so that any yarn passing linearly through said passageway would have continuous filaments commingled with one another.