Abstract: Filaments emerging from the nozzle plate of a spinneret are cooled by being passed through a cooling channel. The motion of the filaments through the cooling channel serves to suck-in air through an air inlet arrangement of the cooling channel. The air inlet arrangement includes an upper air inlet which sucks-in air at the underside of the nozzle plate, so that the filaments are contacted by the cooling air immediately upon emerging from the nozzle plate. Contact of the cooling air with the filaments (which are drawn off at a speed of at least 2400 m/min) takes place throughout the length of the cooling channel.

Abstract: A process for producing spin-oriented continuous filaments at a draw-off speed of more than 2400 m/min, whereby the filaments extruded through the spinnerets of the spinning heads are cooled in cooling shafts by the ambient air entrained as a result of the suction action of the filaments and the filaments leaving the cooling shafts enter a chamber that is separate from the intake environment where the air pressure is regulated at a lower pressure in comparison with the air pressure in the intake environment.

Abstract: A process for producing spin-oriented filaments at a draw-off speed of more than 2400 m/min, whereby the filaments extruded from a spinneret are solidified in a cooling shaft solely by the ambient air entrained by the suction effect of the filaments and the cooling shaft having a zone where the walls are air permeable directly beneath the spinneret and has a following zone where the peripheral walls are completely closed.

Abstract: An improved process and apparatus for the spin-drawing of high-tenacity, technical-grade yarns is disclosed. The process and apparatus are particularly suitable for use with polyamide and polyester. High quality yarns having a low break elongation are obtained by maintaining the feed roll system at a constant temperature T.sub.E =(T.sub.G -20.degree. C.) to (T.sub.G +65.degree. C.), wherein T.sub.G is the temperature of the glass transition point. Filaments are passed over a roll system disposed between the feed roll system and the draw roll system and driven at a peripheral speed between that of the feed roll and draw roll systems. The filaments are passed over the roll system a maximum of three turns.

Abstract: Improved synthetic spun fibers are disclosed. The fibers have improved properties, especially with respect to the strength-elongation properties, the texturability by means of friction units or gas jet turbulence and the subsequent treatability of the fibers without the interpolation of a separate stretching operation. The fibers are produced from polyester and polyamides.

Abstract: A spinning manifold for melt-spinning synthetic high polymers is disclosed. The manifold has an elongated hollow body with cavities for the conduction of a heating medium, such as diphenyl, and a vertical nozzle shaft having heatable members placed between serially arranged and dismountable nozzle blocks such that the side walls of the heatable members are in heat exchange with adjacent nozzle blocks. These heatable members are displaceably mounted within the nozzle shaft. The pump shaft of the spinning manifold may also have additional heatable members placed between the pumping units. The same heating medium that flows through the cavities of the spinning manifold is placed within the heatable members.

Abstract: An improved process and apparatus for the melt-spinning of synthetic polymers are disclosed. The process and apparatus are preferably adapted to polymers such as polyamide 6, polyamide 66, polyester and their copolymers. The polymers are melt-spun in a spinneret and the resulting filaments are withdrawn at a speed between 600 and 6000 meters/min. The distance between the uppermost blow point of the cooling zone and the spinneret surface is selected so that the distance is within a range, the upper limit of which is defined by the relation B and the lower limit is defined by one of the relations A.sub.1 or A.sub.2 or A.sub.3 as follows:B=48.2 (log v)-109 (mm)A.sub.1 =34.4 (log v)-71 (mm)A.sub.2 =-32 (log v-3.356).sup.2 +34 (mm)A.sub.3 =-44 (log v-3.221).sup.2 +32 (mm),where v is the spinning withdrawal speed in meters/min.

Abstract: An improved process for the spin-drawing of high-tenacity, technical-grade yarns is disclosed. The process produces yarns of high industrial quality having a low break elongation and low reference elongation, or a low heat shrinkage and low reference elongation. The process is especially suitable for yarns of polyamide and polyester.

Abstract: A method for draw-off of polyamide threads at very high speeds, say 1800 to 5000 m/min, while maintaining high quality threads and producing stable packages. The method comprises heat treating the threads, after an initial air-blast cooling, by passing them through a spinning duct the walls of which are heated to a preselected temperature below 140.degree. C. and above T.sub.min. Minimum calculated from the following equation: ##EQU1## wherein v=draw-off speed in m/min, and T.sub.a is a temperature value=O for spinning ducts over 1500 mm in length, or 6.degree. C. for each 100 mm reduction in duct length under 1500 mm. The heat treated threads are subjected to a finishing and wetting operation and then drawn off at the high speed.