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: A process for producing a web fleece of thermoplastic polymer filaments. Filaments of thermoplastic polymer are spun from a spinneret to form a curtain passing through a cooling chamber and a stretching channel. The volume rate of flow of the thermoplastic polymer from the spinneret, the volume rate of flow of air, the velocity of the air and the temperature of the air in the cooling chamber and stretching channel are so controlled that individual filaments of the curtain have filament diameters less than .mu.m and a degree of crystallinity less than 45%. The filaments of the curtain are collected on a continuously moving sieve belt in a mat whose crossing points fuse together. The mat is heated to a stretching temperature of 80.degree. to 150.degree. C. and stretched axially by 100 to 400%. The biaxially stretched mat is heated to a temperature above that of the stretching temperature to thermofix the web.