Abstract: A nozzle for producing filaments or fibers of thermoplastic synthetic resin has at the nozzle end one or more bores, preferably opening at a flat surface and receiving respective inserts or shaped bodies which are formfitting in the bores and have along their peripheries respective nozzle channels opening at orifices through which the synthetic resin is discharged. Air streams may be directed at the strand at an acute angle when fibers are to be produced.

Abstract: A web or fleece of synthetic resin strand collected on a sieve belt is discharged from the sieve belt into further processing equipment over a rerouting roller at the discharge end of the sieve belt. The rerouting roller is perforated and air or another fluid medium is passed through the belt at the rerouting roller to reduce adhesion forces between the belt and the web and lift the web from the belt without damage to the belt.

Abstract: An apparatus for producing a melt blown web in which the collecting screen upon which the filaments are deposited passes over a plurality of suction regions or areas which have respective suction blowers and controls for the suction force and air throughput.

Abstract: A spun-bond web-making apparatus has the cooling passage below the spinneret provided with a plurality of air chamber sections which are supplied with air at different temperatures, the cooling passage being connected to the drawing unit for aerodynamic stretching of the filaments without a gap through which external air can be supplied.

Abstract: An apparatus for producing spun-bond webs has, beneath the receiving belt, a suction unit having at least two suction zones including a primary suction zone and at least one other suction zone, the primary suction zone receiving most of the filaments from an aerodynamic stretching unit below a spinneret. The suction speeds in the two zones can be adjusted independently of one another. Preferably three such zones are provided in succession in the direction of displacement of the perforated belt.

Abstract: In the production of a spunbond web by aerodynamically stretching thermoplastic filaments from a spinneret, the stretching nozzle is formed by two nozzle-forming units each of which has a temperature control device, especially a heater, to minimize deformation at the stretching nozzle defining wall. The result is a reduction in the tolerance of the basis weight of the spunbond web.

Abstract: A spun-bond apparatus has at the lower edge of the diffuser below the filaments stretching shaft, cooler and spinneret, partitions which run from the lower edge of the diffuser to upper rollers and pressing roller pairs upstream and downstream of the diffuser along the perforated collecting belt on which the spun-bond web is formed. These partitions parallel to the belt and spaced 15 to 50 mm from the collecting surface have been found to limit turbulence which tends to affect the structure of the web in earlier spun-bond fabricating apparatus.

Abstract: An apparatus for the continuous production of spun-bond web separates the in-lowing process air section including the aerodynamic drawing shaft at which the thermoplastic filaments form a spinneret are drawn, from the depositing section in which the filaments are passed through a diffusor and deposit in an entangled form as spun-bond web on a perforated sieve belt. The suction below the belt and the process air blower are independently controlled as part of the separation and the drawing channel forms an air lock while an air inlet gap is provided between the drawing channel and the inlet of the diffusor to further separate the two sections. The resulting apparatus has a high versatility with all products made and materials which can be used.

Abstract: An apparatus for producing spun-bond fleece has the process shaft connected to a source of process air and opening into a depositions shaft centrally thereof and flanked by streams of air bypassing the process shaft. The result is a random jumbling of the fibers as they deposit on the moving belt such that a uniform filament density and homogeneous mesh width are obtained without singularities and without conglomeration of the filaments in the shafts.

Abstract: A fleece-making apparatus has a vertically extending and horizontally elongated process shaft having upper and lower ends, a nozzle head at the upper shaft end for emitting a multiplicity of continuous thermoplastic strands that descend in the shaft as a curtain, and a foraminous conveyor belt at the lower shaft end for receiving and conveying away the filaments. A main stream of air flows downward in the shaft from the upper shaft end to the lower shaft end and through the belt for cooling and stretching the filaments and depositing the filaments on the belt. A pair of horizontally elongated and downwardly open second inlet slots flank the curtain of filaments below the upper shaft end, a pair of horizontally elongated third inlet slots flank the curtain of filaments below the second slots, and a pair of horizontally elongated third outlet slots flank the curtain of filaments below the third inlet slots and above the lower end.

Abstract: Nonwoven spun-bond is produced by a stationary pressure apparatus in which the shaft below the spinneret has an inlet section followed by the downwardly converging intermediate section, a drawing section and a diffuser opening above the collecting belt through which air is drawn by a suction device. The process air velocity profile has an intersection point with the drawing value at the intermediate section and the distance between the intersection point and the spinneret is smaller than the distance between the intersection point and the bottom end of the drawing section.

Abstract: A spin blowing apparatus for producing spun fleece of thermoplastified synthetic resin provides that the spinneret plate and/or the fiber or filament blowing gap through which the blowing air/fiber mixture passes downwardly and/or the air flow resistance of the perforated belt upon which the fleece is collected can be varied in response to measured values of the specific weight and/or air permeability of the web to restore any deviation of the latter.