Abstract: An apparatus for preparing a nonwoven web in which a bundle of continuous filaments is jetted from a nozzle together with a fluid stream, the filaments and the fluid stream impinge upon a first impinging surface, and after impinging, the filaments and at least a part of the fluid stream are guided to a collecting surface by a second impinging surface.

Abstract: A heat treatment apparatus which comprises a treatment chamber formed with heat insulating walls, a graphite heater installed in the treatment chamber, a gas supply port supplying non-oxidizing gas to the chamber and an exhaust port for carrying gas out of the chamber. At least a part of the inner side of the heat insulating walls is made of graphite group material of bulk density of not less than 0.3 g/cm.sup.3. The ratio of the outer surface area of the graphite heater (Ah) to the surface area of the chamber-facing side of the heat insulating walls (Ai), Ah/Ai is within the range of 0.1-0.4, and the relationship between the surface area of the graphite group material (Ar) and (Ah) is Ar>Ah. By this structure, the temperature of the heater to be set for heat treatment of workpieces can be decreased, and the life spans of the heater and the heat insulating walls can be increased.

Abstract: Between a feed roll feeding an entangled multifilament yarn to a measuring zone of degree of entanglement and a yarn-forwarding roll forwarding the yarn out of the measuring zone are disposed a first tension roll with a weight attached thereto, a pulley connected to a rotation meter and supported free to rotate, and a second tension roll with a weight attached thereto. A needle capable of piercing the yarn is provided between the pulley and either one of the first and the second tension rolls. Under the state wherein the needle pierces the yarn, an auxiliary weight is added to the first or the second tension roll, and the movement distance of the yarn from the position where the needle pierces the yarn to the position where the point of entanglement is engaged with the needle is measured by detecting the amount of rotation of the pulley.

Abstract: A yarn-threading method and device wherein a suction gun being fed with a pressurized liquid jet of not less than 80 kg/cm.sup.2 G is placed next to a running yarn; the yarn is attracted and taken into a yarn-guide hole of said suction gun, producing a state of attracting the yarn running at a speed of not less than 4,500 m/min.; and with this state of the yarn being maintained, the suction gun is moved to thread the attracted yarn on a winder means rotating at a speed of not less than 4,500 m/min.

Abstract: A melt-spinning apparatus usable for producing various synthetic fibers in various manners, including a polymer melter; a heat-insulating housing having a detachable ceiling cover and a bottom having an opening; a detachable beam block having a cavity formed between a pair of longitudinal side walls, one of which has a polymer melt outlet; a melt-spinning pack arranged below the beam block and having a head projection inserted into the cavity, the head projection having a polymer melt inlet; a polymer melt passage system extending from the polymer melter to the polymer melt outlet; a fixing means for fixing the melt-spinning pack detachably to the beam block including a pushing member for pushing the head projection of the melt-spinning pack toward the longitudinal side wall having the polymer melt outlet to cause the polymer melt inlets to be fluidtightly connected to the polymer melt outlets, and optionally, means for protecting the polymer melt inlet from damage which the melt-spinning pack is inserted int

Abstract: An improved spinneret for use in producing composite filaments, comprises: nozzles for feeding at least an island constituent melt; a combining chamber having a horizontal bottom surface, into which chamber a sea constituent melt is introduced, the combining chamber having discharging outlets for the sea melt in combination with the respective nozzles, each combination being connected to an outlet for extruding a primary composite melt stream of a "core in sheath" type or a secondary composite melt stream of an "islands in a sea" type.

Abstract: Apparatus for imparting a good cohering property to a multifilament yarn by applying a continuous main jet stream of a fluid to a running multifilament yarn in a yarn treating zone, while impinging a subsidiary jet stream having a discontinuous pressure wave against the above-mentioned continuous main jet stream so as to expose the running multifilament yarn to the impinging jet stream having a resonance sharpness of at least 2 at the position outlet aperture of the yarn treating zone.

Abstract: Yarn treating apparatus having a yarn treating chamber formed therein which is surrounded by a first wall lying on a flat plane extending axially and a second wall connected to the sides of the first wall and constituted with a plurality of flat surfaces, a curved surface, or a plurality of curved surfaces or a combination thereof. The second wall is symmetrical with respect to an imaginary standard plane, perpendicular to the first wall and axially extending. A plurality of fluid jet nozzles is formed on the second wall, and fluid jet flows symmetrical with the imaginary standard plane are ejected from the fluid jet nozzles and meet with each other on or above the first wall before they reach it or on the first wall while they blow towards the first wall.

Abstract: A compact melt spinning apparatus having a screw-type extruder or extruders is provided. A metering pump or pumps, a molten polymer conduit or conduits and a spinning pack or packs and optionally the barrel(s) of the extruder(s) are positioned inside a heating frame encased in a casing of a thermal insulation material. The conduit(s) is arranged on a horizontal plane located above the spinning pack(s), and the extruder(s) and the metering pump(s) are arranged in a horizontal line and located above the conduit(s).

Abstract: An apparatus for producing a multiple layer conjugate fiber having a housing with a rotary cylinder plug and a stationary spinning plate. The housing is provided with at least two polymer feed inlets and the rotary cylinder plug contains at least two grooves along the outer periphery and passageways in communication with the grooves which open out at the lower surface of the rotary plug. The spinning plate contains a plurality of spinning orifices that are positioned and lined up with the passageways of the rotary cylinder plug. Means are provided for forming a limited space or multiple laminar chamber.