Nozzle (1) for manufacturing knotted yarn (11), having a yarn duct (2) in which knots are producible with the aid of air entanglement. The nozzle includes at least one air bore (3) having a longitudinal axis (A), which merges with the yarn duct (2) in a merging opening (4). Air is introducible into the yarn duct (2) through the air bore. The longitudinal axis (A) of the air bore (3) is disposed at an angle of less than 90, preferably 65-85, particularly preferably 78 in relation to a conveying direction (B) of the knotted yarn (11). A baffle face (5) is configured on the opposite side of the merging opening (4) of the air bore (3) in the yarn duct (2), so as to be substantially perpendicular in relation to the longitudinal axis (A) of the air bore (3).

An air-jet type spinning device (4), comprising a body (8) at least partially hollow which defines a spinning chamber (12), a fibre feed device (16), facing said spinning chamber (12) so as to feed the fibres into the spinning chamber (12), a spinning spindle (20) at least partially inserted in the spinning chamber (12) and fitted with a spinning channel (24) for the suction of yarn obtained from said fibres, the spinning channel (24) defining a spinning direction (X-X), at least one channel (28) for sending a jet of compressed air inside the spinning chamber (12). Advantageously, the spinning chamber (12) is delimited at least partially by an outer side wall (32), opposite the spinning spindle (20), wherein at least one thread (36) is made on said outer side wall (32), wherein said at least one channel (28) is oriented so as to direct the jet of compressed air towards the at least one thread (36) in order to be guided and oriented by the latter.

An object of the present invention is to provide a bulky yarn made of synthetic fibers, which is suppressed in tanglement between filaments while having a loop shape in the surface layer thereof, and has a soft texture and is light and excellent in heat retention properties while being good in handleability in high-order processing. The present invention provides a bulky yarn made of synthetic fibers, including: a sheath yarn (1) having a three-dimensional crimped structure; and a core yarn (2) twisted with the sheath yarn (1) to fix the sheath yarn (1), wherein the sheath yarn (1) is not substantially broken and continuously forms loops.

The present invention provides a novel down-like cotton material which is bulky, light-weight, excellent in washing resistance, heat-retaining property and heat insulation property and provides volume feeling, without odor from animals.

The down-like cotton material 1 of the present invention is formed as a cotton-like long fiber, in which filaments of an axial fiber and a float each composed of a polyester raw yarn are united by air entangling in air flow to be entangled, connected and integrated to have a down ball-like mass in an aligned form, and the diameter of the down ball-like mass is 1.0 to 3.5 cm and down ball-like masses are continually aligned at an interval of up to about 10 cm or less in a length direction of the axial fiber.