John Brown Deutsche Engineering Gmbh

Didier Engineering Gmbh

Bergwerksverband Gmbh

Buhler Ag

Krupp Uhde Gmbh

Rudolf Geier

Ingo Romey

Andreas Christel

Jurgen Hartig

Rolf H Joest

Jurgen Rink

Erhard Krumpholz

Ingo Efflander

Wilhelm Wullscheidt

Klaus Stemmer

Klaus Kleinecke

Theodor J Urgens

Wilhelm W Ullscheidt

Wolfgang Kramer

Ingo Eiflander

Theodor JÜRGENS

Brent-Allen Culbert

The invention relates to a method and a device for the production of spherical particles, whereby a molten prepolymer or precondensate is transformed into droplets by means of a drip nozzle, the droplets are subjected to a countercurrent with a gas in a precipitation column until at least partial crystallization is achieved and are then subjected to an additional post-crystallization phase. In order to economically produce higher quality particles at a high flow rate, the molten prepolymer is transformed into droplets by means of a vibrating nozzle plate and/or direct vibration of the molten prepolymer or polymer and resulting droplets are subjected to an air and gas countercurrent.

Method and device for producing spherical particles from a polymer melt

Polyester yarn is made by melt spinning the polyester filaments which are then cooled at least to solidification and heated by counterflow with prestretching to a crystallinity in excess of 24%. The prestretched filaments are gathered and stretched to after-stretching at a temperature of 80.degree. C. to 250.degree. C. to a final titer of 1.0 dtex to 7.5 dtex with a stretching ratio of 1:1.5 to 1:1.15. The yarn is then wound up at a rate of 5000 to 8000 m/min.

Method of and apparatus for the production of polyester yarn

Process and device for producing polyester yarns

Process and polycondensation apparatus for the treatment of contaminated

Polyester resin for producing articles having high transparency and a

Pitch from coal tar pitch, method of its production, as well as

A staple-fiber band is made by first spinning synthetic-resin filaments with spinnerets and drawing the filaments as roving at a predetermined feed speed from the spinnerets. The roving is then cooled without greatly stretching it so it has relatively high residual stretch and is then stored. Without intermediate treatment the roving is heated to a predetermined temperature and then stretched it to a relatively small residual stretch. The stretched roving is then thermofixed and then stretch-torn. Finally it is textured. During the heating, thermofixing, stretch-tearing, and texturing steps the roving is held under tension so that its filaments cannot tangle. When the filaments are of polyester they are stretched at between 60.degree. C. and 120.degree. C. and thermofixed at a temperature that can be somewhat higher.

Method of making a staple-fiber band

Growing community of inventors

Essen, Germany

Rudolf Geier