Bayer Aktiengesellschaft

Dieter Paulini

Wolfram Wagner

Edgar Muschelknautz

Michael Bueb

Robert Bruck

Peter Schmitz-Bastian

Ulrich Reinehr

Peter R Nyssen

Gunter Turck

Karlheinz Feltgen

Dirk Berkenhaus

Egon Kunzel

Siegfried Kulisch

Dieter Heinkes

Peter Widder

Peter Landen

Herbert Groschel

Gunter Bieber

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 compressing chamber (7) for directed crimping consists of step-shaped bars (8) by way of increasing outwards in length.

Device for crimping large filament groups

For the purpose of conveying slivers the latter are fed over constructional units (15) which are situated behind each other in a staggered maner from injector (8), in a pipe (16) including a guide means (17) by means of an air supply, and subsequently carried further by mechanical means.

Conveying of filament bundles over long conveying sections

Filament cables are crimped and the crimp cake of the filament cable obtained is passed over a gas permeable screen plate while gas flows to the bottom of the cake from flow through the screen plate so that the cake can be moved over the plate without making contact therewith or with reduced contact force and can be treated during its residence over the screen plate.

Process for treatment of filament cable

A method for sealing a passage (2) in a wall (3) for the unsupported transport of continuously accumulating tows (1), in which the pressure difference on both sides of the wall (3) is compensated by an additional gaseous medium (5).

Sealing of apparatus with continuous product transport

The treatment of a filament cable in a device into which it is introduced, in which it is crimped, treated with a gas, and withdrawn, characterized by the fact that the cable is crimped using a crimping device which is operated gas-dynamically, which has been mounted into the front face of a device for the treatment of the cable with a gas, and is thus introduced into this device in the manner of a sluice, and is folded using a slide with an S-shaped section onto a gas-permeable, horizontally transporting base as a crimping cake, is treated there with the gas, and is finally withdrawn from the device.

Process for the treatment of a filament cable

Polyacrylonitrile filaments and fibers may be obtained without interruption by spinning the spinning solution into a hot-air spinning duct, washing, drawing, crimping, preparing, steaming, drying cooling and, optionally, cutting at a take-off rate kept at 150 to 400 m/minute and for a tow weight of from 10 to 100 g/m when

Continuous process for the production of polyacrylonitrile filaments and

In the process of washing synthetic fibers directly subsequent to the spinning process in which the tow is deposited in a folded condition onto a transportation device, the solvent is removed as completely as possible with the use of as little fresh water as possible if the washing process is carried out on the folded tow in counterflow on this transporting device.

Growing community of inventors

Dormagen, Germany

Dieter Paulini