Bayer Faser Gmbh

Bayer Aktiengesellschaft

Gunter Turck

Ulrich Reinehr

Toni Herbertz

Wolfgang Anderheggen

Tilo Sehm

Gino Antolini

Hermann-Josef Jungverdorben

Rolf B Hirsch

Theo Neukam

Rudolf J Klee

Dieter Paulini

Dieter Heinkes

Wilfried Naunheim

Egon Kunzel

This invention relates to a new washing apparatus for the continuous production of elastane filaments which are produced by a wet-spinning process, which essentially consists of a stripping unit (10) and a washing unit (11) which are disposed in steps above the precipitation bath (1) of a wet-spinning device.

Apparatus and a process for washing continuously wet-spun elastane

The invention relates to a process for preparing multifilament, wet-spun elastane threads with increased spinning output, which is achieved by largely removing entrained water from the filaments after leaving the spinning bath and then fixing the threads on at least two rollers at a temperature of at least 200.degree. C. for at least 3 seconds.

Process for preparing multifilament, wet-spun elastane threads

The invention relates to a process for adjusting the viscosity of highly concentrated elastane solutions by reaction of the solution with secondary aromatic amines in order to produce spinning solutions for the dry or wet spinning of elastane fibres.

Process for adjusting the viscosity of highly concentrated elastane

Process for preparing multifilament wet-spun elastane threads

The invention relates to a process for adjusting the viscosity of highly concentrated elastane solutions by reaction of the solution with secondary aromatic amines in order to produce spinning solutions for the dry or wet spinning of elastane fibers.

The process for production of polyacrylonitrile hollow threads with a stable, asymmetric pore structure by a dry-wet-spinning process with glycerine-based core liquids, definite draw and after treatment conditions and a treatment with alcohols and drying.

Method of preparing polyacrylonitrile hollow threads with asymmetric

A process for the discontinuous or (preferably) continuous production of dry spun hydrophilic acrylic fibers and threads with a core/sheath structure which have improved color fastness properties, more uniform cross-sections and better processing characteristics. By employing a new after-treatment combination of more intensive counterflow washing, stretching in steam, fixing in steam and careful drying of the fibers as staple fibers, improved hydrophilic fibers with a water retention capacity above 30% can be obtained from spinning solutions which have a much lower non-solvent content than is necessary in the present-state of the art for obtaining a high water retention capacity of the order indicated above.

Process for the production of hydrophilic acrylic fibers

A process for dry spinning of synthetic polymers, in particular PAN threads containing more than 85 wt. % acrylonitrile in the PAN (co)polymer, with high spinning chimney capacities of at least 20 kg PAN solid per spinning chimney and hour, using superheated steam as the spinning gas and with in-chimney finishing with water or aqueous finishes.

Pan dry spinning process of increased spinning chimney capacity using

A process for the dry spinning of synthetic polymers, in particular polyacylonitrile fibres, from solutions in high polar solvents, such as dimethylformamide, which are heated to 100.degree.-150.degree. C. shortly upstream of the spinneret and spun there by spinnerets having a certain shape, and in the spinning cell the specific energy supply is at least 0.090 kWh per m.sup.2 of heated cell area, the cell is charged with at least 70 m.sup.3 (S.T.P.) of hot air per hour, and the filaments are treated in the lower part of the cell with water or aqueous preparations, so that the temperature of the filaments which leave the cell is decreased below 110.degree. C. Under these conditions, the unexpectedly high spinning cell outputs of at least 20 kg of PAN solid per spinning cell per hour can be achieved without yellowing or self-ignition of the filaments occurring.

Growing community of inventors

Dormagen, Germany

Gunter Turck