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 The polymers are melt-spun in a spinneret and the resulting filaments are withdrawn at a speed between 600 and 6000 meters/min.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.