US 12,286,735 B2 · Method for producing spunbonded fabric

Abstract

A process for the production of spunbonded nonwoven (1) is shown, wherein a spinning mass (2) is extruded through a plurality of nozzle holes (4) of at least one spinneret (3, 40, 50) to form filaments (5) and the filaments (5) are drawn, in each case, in the extrusion direction, wherein the filaments (5) are deposited on a perforated conveying device (10) to form a spunbonded nonwoven (1) and wherein the nozzle holes (4) of the spinneret (3, 40, 50) are arranged along a main axis (6) oriented in a transverse direction (12) to the conveying direction (11) of the conveying device (10) so that the spunbonded nonwoven (1) formed on the conveying device (10) extends in this transverse direction (12). So as to enable the spinning width and the basis weight distribution of the spunbonded nonwoven to be adjusted reliably and, respectively, to allow the basis weight distribution to be kept constant during operation by means of the process, it is suggested that the spinning mass throughput (31) of the nozzle holes (4) is adjusted variably along the transverse direction (12).

Claims26

Dependent claims

A process for producing a spunbonded nonwoven comprising:

extruding a spinning mass through a plurality of nozzle holes of at least one spinneret to form filaments, and
drawing the filaments, in each case, in an extrusion direction, wherein the filaments are deposited on a perforated conveying device to form the spunbonded nonwoven,
wherein the plurality of nozzle holes of the at least one spinneret are arranged along a main axis oriented in a transverse direction to a conveying direction of the perforated conveying device so that the spunbonded nonwoven formed on the perforated conveying device extends in the transverse direction,
wherein a spinning mass throughput of the plurality of nozzle holes is adjusted variably along the transverse direction, and
wherein the spunbonded nonwoven has at least one edge cut area of a lower basis weight.

2 more elements

A process for producing a spunbonded nonwoven comprising:

extruding a spinning mass through a plurality of nozzle holes of at least one spinneret to form filaments,
drawing the filaments, in each case, in an extrusion direction, wherein the filaments are deposited on a perforated conveying device to form the spunbonded nonwoven,
measuring an actual basis weight distribution of the spunbonded nonwoven,
determining a difference between the actual basis weight distribution and a predefined target basis weight distribution, and
variably adjusting the spinning mass throughput of the plurality of nozzle holes in a transverse direction as a function of the difference that is determined,
wherein the plurality of nozzle holes of the at least one spinneret are arranged along a main axis oriented in the transverse direction to a conveying direction of the perforated conveying device so that the spunbonded nonwoven formed on the perforated conveying device extends in the transverse direction,
wherein a spinning mass throughput of the plurality of nozzle holes is adjusted variably along the transverse direction, and
wherein a conveying speed of the perforated conveying device is adjusted as a function of the difference between the actual basis weight distribution and the predefined target basis weight distribution.

5 more elements

Dependencies are inferred from the claim text.

Method for producing spunbonded fabric

Life of this patent

Method for producing spunbonded fabric

Life of this patent

Abstract

Claims26