Barmag Ag

Saurer Gmbh & Co. Kg

Klaus Sch&auml;fer

Detlev Schulz

Hansj&ouml;rg Meise

Hans-Gerhard Hutter

Dieter Wiemer

Egon Gathmann

Ulrich Enders

Georg Stausberg

Roland Nitschke

Friedel Dickmeiss

Peter Senge

Gerhard M&uuml;ller

A method of melt spinning a group of multifilament yarns ( ) from a polymer melt, wherein each group of yarns ( ) is formed from a plurality of filaments ( ) that are extruded through a nozzle bore ( ) and withdrawn by a withdrawal means by the action of a withdrawal tension. In accordance with the invention, each group of yarns ( ) is cooled in a precooling zone ( ) and in an aftercooling zone ( ) downstream thereof. The cooling in the precooling zone ( ) and in the aftercooling zone ( ) is adjusted such that the group of yarns ( ) is cooled within the aftercooling zone ( ) by the action of a coolant flow directed into the path of the yarn, so that the filaments ( ) of the group of yarns ( ) solidify in a solidification range within the aftercooling zone ( ).

Method for melt spinning filament yarns

A melt spinning apparatus for spinning a synthetic yarn, wherein the yarn is formed by combining a plurality of filaments and wound to a package by means of a takeup device downstream of the spinning apparatus. Downstream of the spinneret, an inlet cylinder with a gas-permeable wall and a cooling tube are arranged. The cooling tube connects to a suction device such that an air stream forms in the cooling tube in the direction of the advancing yarn. This air stream assists the advance of the filaments and leads to a delayed cooling. To ensure adequate cooling of the filaments within the cooling zone, an air supply device is provided for generating an additional cooling air stream which flows in the axial direction of the cooling tube for cooling the filaments downstream of the inlet to the cooling tube.

Apparatus and method for melt spinning a synthetic yarn

A method and an apparatus for melt spinning a multifilament yarn from a thermoplastic material, wherein a spinneret extrudes the thermoplastic material to strandlike filaments, which are initially in liquid form and then cooled to cause their solidification. For purposes of cooling, the filaments are precooled in a cooling zone downstream of the spinneret in such a manner that the filaments do not solidify. Subsequently, the filament bundle advances by the action of a coolant stream directed in the direction of the advancing yarn into a tension zone and undergoes further cooling until the filaments solidify in a solidification zone within the tension zone. To maintain the location of the solidification zone within the tension zone in a predetermined desired range thereof, an adjustable cooling of the filaments within the cooling zone is provided.

Method and apparatus for melt spinning a multifilament yarn

A method and an apparatus for producing a highly oriented yarn (HOY) wherein the yarn is withdrawn from the nozzle of a spinneret at a withdrawal speed of at least 6,500 m/min. The filaments forming the yarn are drawn during their solidification, so that a highly oriented molecular structure forms in the polymer. To withstand the withdrawal tension generated by the high withdrawal speed without overstressing the filaments, the filaments are assisted in their advance before they solidify such that prior to the solidification a tensile stress relief is effective on the filaments, and that during the solidification a reduced withdrawal tension is effective on the filaments while they are drawn.

Method and apparatus for producing a highly oriented yarn

An apparatus for mixing and advancing a polymer melt, which includes a mixer and a conveying device. The mixer comprises a tubular mixing shaft (outer shaft) and an inner mixing shaft (inner shaft). The tubular outer shaft is arranged in surrounding relationship with the inner mixing shaft. Both mixing shafts extend in cantilever fashion into a mixing chamber, and a passageway is formed at the front end between the mixing chamber wall and the free end of the outer shaft, so that the mixing chamber is divided into an inner mixing chamber (inner chamber) and an outer mixing chamber (outer chamber), which are interconnected via the passageway. A melt inlet and a melt outlet are arranged in such a manner that the melt flow advances through the inner chamber and the outer chamber in opposite directions.

Growing community of inventors

Remscheid, Germany

Klaus Schäfer

Growing community of inventors

Remscheid, Germany

Klaus Sch&auml;fer

Klaus Schäfer