Lenzing Aktiengesellschaft

Ibrahim Sagerer-Foric

Malcolm Hayhurst

Mirko Einzmann

Malcolm John Hayhurst

Gisela Goldhalm

Tom Carlyle

Katharina Mayer

Markus Malzner

Matthias Gschwandtner

Martin Lichtenthal

A process for the production of spunbonded nonwoven () is shown, wherein a spinning mass () is extruded through a plurality of nozzle holes () of at least one spinneret () to form filaments () and the filaments () are drawn, in each case, in the extrusion direction, wherein the filaments () are deposited on a perforated conveying device () to form a spunbonded nonwoven () and wherein the nozzle holes () of the spinneret () are arranged along a main axis () oriented in a transverse direction () to the conveying direction () of the conveying device () so that the spunbonded nonwoven () formed on the conveying device () extends in this transverse direction (). 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 () of the nozzle holes () is adjusted variably along the transverse direction ().

Method for producing spunbonded fabric

A process () for the production of spunbonded nonwoven () and a device () are shown, comprising an embossing pattern (), wherein a spinning mass () is extruded through a plurality of nozzle holes of at least one spinneret () to form filaments () and the filaments () are drawn by a drawing air stream (), in each case, in the extrusion direction, with the filaments () being deposited on a perforated tray () of a conveying device () to form a spunbonded nonwoven (). So as to allow an efficient, technically simple and inexpensive introduction of the embossing pattern into the spunbonded nonwoven, it is suggested that the perforated tray () has an embossing structure () with an embossing pattern (), the filaments () are pressed into the embossing structure () by the drawing air stream () and the spunbonded nonwoven () thus formed is provided with the embossing pattern ().

The invention relates to a process for the production of spunbonded nonwoven and a device for the production of spunbonded nonwoven, wherein, in the process, a spinning mass is extruded through a plurality of nozzle holes to form filaments, the filaments are drawn in the extrusion direction, precipitated at least partially by being subjected to a coagulation air stream comprising a coagulation liquid and deposited to form the spunbonded nonwoven. To establish a process which permits a cost-efficient and simple adjustment of the air permeability of the spunbonded nonwoven, it is suggested that the air permeability of the spunbonded nonwoven is adjusted on the basis of at least one parameter of the coagulation air stream in that the actual air permeability of the spunbonded nonwoven is measured, the difference between the actual air permeability and a predefined target air permeability is determined and the at least one parameter of the coagulation air stream is changed as a function of the determined difference.

Process for the production of spunbonded nonwoven

A device for laying down filaments () into a spundbond fabric (), dehumidifying the spundbond fabric () and sucking off the process air loaded with solvents and coagulants, including a conveyor device () for transporting the spundbond fabric () in a transport direction, wherein the conveyor device () has a deposition surface () for the filament (), wherein the conveyor device () at least in the region of the deposition surface () is permeable for gases and liquids, wherein underneath the deposition surface () of the conveyor device () there is provided a primary dehumidifying device (), wherein there is arranged at least one upper suction device () upstream and/or downstream and/or laterally of the deposition surface ().

Method and apparatus for precipitating solvent out of the process air in spunbond production

A plant () for the production of spunbonded nonwoven (), comprising a spinning solution production (), a spinning system (), a device () for the delivery of coagulation liquid, at least one conveying device () for depositing the spunbonded nonwoven (), and a collecting device () for the spunbonded nonwoven (), wherein at least one discharge device () is provided between the device () for the delivery of coagulation liquid and the collecting device () for the spunbonded nonwoven ().

Method for recovering solvent and cellulose in the production of cellulosic spun-bonded nonwoven fabrics

The present invention relates to a method for cleaning a spunbonding spinneret for the production of cellulosic spunbonded nonwoven fabric from a solution of cellulose in an aqueous organic solvent by extruding the solution through nozzle holes of the spunbonding spinneret to form filaments and stretching the filaments in the direction of extrusion by means of a gas stream, during which method contaminations containing cellulose will accumulate on the spinneret surface. The method according to the invention comprises the steps of: a) spraying the contamination with an aqueous fluid precipitating the cellulose; and b) detaching and carrying away the contamination by means of the gas stream.

Method and device for cleaning spinnerets while producing cellulose spunbonded nonwoven fabric

This invention relates to a process and a device for manufacturing cellulose-based webs which are directly formed from lyocell spinning solution and in particular for the washing of directly formed cellulose webs.

Process and device for the formation of directly-formed cellulosic webs

This invention relates to a nonwoven material consisting of one or more layers of nonwoven webs of essentially continuous cellulosic filaments, characterized in that within each layer each of the three bonding mechanisms: a) hydrogen bonding, b) filament intermingling and c) merged filament bonding occur for bonding the essentially continuous cellulosic filaments. Further it relates to a process for the manufacture and to various uses of this material.

Continuous filament cellulose nonwoven made with multiple bonding techniques

A nonwoven cellulose fiber fabric, in particular directly manufactured from lyocell spinning solution, wherein the fabric comprises a network of substantially endless fibers, and wherein the fibers are homogeneously merged substantially over the entire fabric.

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Vöcklabruck, Austria

Ibrahim Sagerer-Foric