Abstract: The present invention relates to a process for producing and winding partially oriented polyester multifilament yarns not less than 85% by weight based on the total weight of the multifilament yarn polybutylene terephthalate (PBT) and/or polytrimethylene terephthalate (PTMT) that contain between 0.05% by weight and 2.5% by weight based on the total weight of the multifilament yarn of at least one additive polymer extensibility enhancer, which comprises providing a wound yarn package which is stable in long-term storage and insensitive to elevated temperatures during storage and transportation by heat-treating the wound polyester multifilament yarn package at a temperature in the range from >45° C. to 65° C. The present invention further relates to the polyester multifilament yarns obtainable by the process and to their use.

Abstract: HMLS filaments consisting of a polyester, from 0.1 to 2.5% by weight of an incompatible, thermoplastic, amorphous, polymeric additive having a glass transition temperature of from 90 to 170° C. and a ratio of its melt viscosity to that of the polyester component of from 1:1 to 7:1, and from 0 to 5.0% by weight of conventional additives, where the polymeric additive is present in the filaments in the form of fibrils having a mean diameter of ≦80 nm. Process for the production of these HMLS filaments by static mixing with shearing of the polyester and of the polymeric additive and, optionally, of the additives, spinning of the mixture at a spinning take-off speed of from 2500 to 4000 m/min to give spun filaments which are stretched, heat-set and wound up, where the concentration of the polymeric additive is determined as a function of the pre-specified spinning take-off speed and the desired birefringence of the spun filaments.

Abstract: The present invention relates to a process for producing and winding POY filaments not less than 90% by weight PET, based on the total weight of the POY, at spinning takeoff speeds above 3 800 m/min, which comprises

Abstract: The present invention relates to a process for the production and for the spooling of preoriented polyester filaments comprising at least 90 weight %, relative to the total weight of the polyester filament, of polybutylene terephthalate (PBT) and/or polytrimethylene terephthalate (PTMT), preferably of PTMT, characterized in that: a) the spinline extension ratio is set in the range of 70 to 500; b) the filaments, immediately after exiting from the spinning nozzles, pass through a cooling delay zone from 30 mm to 200 mm in length; c) the filaments are cooled off to below the solidification temperature; d) the filaments are bundled at a distance of between 500 mm and 2500 mm from the lower side of the spinneret plate; e) the tension of the thread in front of and between the draw-off galettes is set to between 0.05 cN/dtex to 0.20 cN/dtex; f) the thread is spooled with a tension of the thread of between 0.025 cN/dtex to 0.15 cN/dtex; g) the spooling speed is adjusted to between 2200 m/min. and 3500 m/min.

Abstract: High strength polyester fibers comprising from 0.1 to 2.0 by weight of an incompatible, thermoplastic amorphous, polymeric additive.

Abstract: PTT staple fibers which are characterised by a novel combination of properties. In combination with novel stress-strain properties and modulus parameters, staple fibers or textiles or home textiles having extremely desirable aesthetics and service quality are obtained. Economical two-stage process for the production of PTT staple fibers. The melt spinning is carried out at a high polymer throughput and a spinning take-off speed of at least 600 m/min. In a separate fiber drawing frame, the stretching, heat-setting, crimping and drying are carried out.

Abstract: A first stream of a polyester melt is divided into a second and a third polyester stream, the flow rate of the first stream being 100 to 2000 kg/h and the flow rate of the second polyester stream being 5 to 300 kg/h. 0.2 to 100 kg/h of a molten additive polymer is metered to the second polyester stream, and the additive polymer together with the second polyester stream is passed through a first mixing line. There is obtained a first polymer mixture whose content of additive polymer is 3 to 50 wt-%. The first polymer mixture is introduced into the third polyester stream, the first mixture together with the third polyester stream being passed through a second mixing line and forming a second polymer mixture. The second polymer mixture is extruded to obtain filaments, the filaments are cooled and combined to threads, the threads are unwound with a speed of at least 1000 m/min. The threads are processed to obtain either continuous threads or staple fibers.

Abstract: The synthetic threads are produced from a polymer mixture consisting of polyamide as base polymer and at least one additive polymer, the polymer mixture being pressed through nozzle openings as polymer melt with extrusion speeds (s) in the range from 18 to 160 m/min. The filaments thus formed are cooled, combined to threads, drawn off and spooled by forming at least one thread spool. The content of additive polymer in the polymer mixture is not less than M wt-% and not more than 2.5 wt-%, where M is derived from 0.0001·v−0.4, where v is the draw-off speed of the thread, and v lies in the range from 4500 to 8000 m/min. The additive polymer is amorphous and virtually insoluble in the polymer melt. In the spooled thread, the additive polymer is present in the base polymer in a fibril structure, the ratio s:v lies in the range from 1:50 to 1:250. Upon spooling, the thread spool preferably has a weight of the spooled thread of at least 4 kg.

Abstract: Polyester staple fibres consisting of a polyester, from 0.1 to 2.0% by weight of an incompatible, thermoplastic, amorphous, polymeric additive having a glass transition temperature of from 90 to 170° C. and a ratio of its melt viscosity to that of the polyester component of from 1:1 to 10:1, and from 0 to 5.0% by weight of conventional additives, where the polymeric additive is present in the staple fibres in the form of fibrils having a mean diameter of ≦80 nm. Process for the production of these staple fibres by mixing with shearing of the polyester and of the polymeric additive and, optionally, of the conventional additives, spinning at a spinning take-off speed of <2500 m/min to give spun filaments, which are combined to form tows and stretched in a separate fibre stretching stage, crimped, dried and chopped to give staple fibres.

Abstract: The present invention comprises a process for producing and spooling preoriented polyester filaments comprising at least 90 weight % (relative to the total weight of the polyester filaments) polybutylene terephthalate (PBT) and/or polytrimethylene terephthalate (PTMT), preferably of PTMT, wherein,

Abstract: The present invention relates to a process for the production and for the spooling of preoriented polyester filaments comprising at least 90 weight %, relative to the total weight of the polyester filament, of polybutylene terephthalate (PBT) and/or polytrimethylene terephthalate (PTMT), preferably of PTMT, characterized in that:

Abstract: The present invention relates to a process for the production and for the spooling of preoriented polyester filaments comprising at least 90 weight %, relative to the total weight of the polyester filament, of polybutylene terephthalate (PBT) and/or polytrimethylene terephthalate (PTMT), preferably of PTMT, characterized in that:

Abstract: The present invention comprises a process for producing and spooling preoriented polyester filaments comprising at least 90 weight % (relative to the total weight of the polyester filaments) polybutylene terephthalate (PBT) and/or polytrimethylene terephthalate (PTMT), preferably of PTMT, wherein,

Abstract: A process of producing a synthetic ultrafine endless yarn on the basis of polyester or polyamide in the range from 0.25 to 0.9 denier per POY filament by melt spinning at draw-off speeds between 2000 and 6000 m/min with a high spinning safety. To the polyester or polyamide a second immiscible amorphous polymer may be added in an amount of 0.05 to 5 wt %. One feature of the invention is the adjustment of a balanced temperature profile in the cross-section of the filament bundle before reaching the draft zone, as well as the suitable adaptation between snap-back length and the draft point of the filaments in the quench duct.

Abstract: A first stream of a polyester melt is divided into a second and a third polyester stream, the flow rate of the first stream being 100 to 2000 kg/h and the flow rate of the second polyester stream being 5 to 300 kg/h. 0.2 to 100 kg/h of a molten additive polymer is metered to the second polyester stream, and the additive polymer together with the second polyester stream is passed through a first mixing line. There is obtained a first polymer mixture whose content of additive polymer is 3 to 50 wt- %. The first polymer mixture is introduced into the third polyester stream, the first mixture together with the third polyester stream being passed through a second mixing line and forming a second polymer mixture. The second polymer mixture is extruded to obtain filaments, the filaments are cooled and combined to threads, the threads are unwound with a speed of at least 1000 m/min. The threads are processed to obtain either continuous threads or staple fibers.

Abstract: The invention concerns a method of processing polymer blends based on polyester or polyamide with a draw-off speed of .gtoreq.1500 m/min to produce filaments with an elongation at break of .ltoreq.180%, where a second amorphous polymer is added to the polyester or polyamide in the amount of 0.05 to 5 wt % and the polymer is a copolymer composed of at least two of the following monomer units:0 to 90 wt % A, wherein A is a monomer of formula CH.sub.2 .dbd.C(R)--COOR.sup.1, wherein R is --H or --CH.sub.3 and R.sup.1 is straight or branched chain C.sub.1 -C.sub.10 alkyl or cyclohexyl.0 to 40 wt % B, wherein B is a monomer of maleic acid or maleic anhydride, and5 to 85 wt % C, wherein C is a monomer of styrene or methyl substituted styrene such that (wt % A+wt % B+wt % C)=100, and these filaments are processed by a drawing process or a stretch texturing process at high speeds. Preferably R.sup.1 is methyl, ethyl, n-propyl, n-butyl, iso-butyl, 2-ethyl-butyl, 2-ethyl hexyl, n-hexyl, n-heptyl, or cyclohexyl.

Abstract: Process for the production of preoriented filaments from polyester-based polymer mixtures by spinning the polymer mixtures with a draw-off speed v of at least 2500 m/min, a second amorphous, thermoplastically processable copolymer having a glass transition temperature of more than 100.degree. C. being added to the polyester, wherein the ratio of the melt viscosity of the copolymer to the melt viscosity of the polyester is 1:1 to 10:1, in that the amount of copolymer added to the polyester is at least 0.05 wt.

Abstract: Filaments emerging from the nozzle plate of a spinneret are cooled by being passed through a cooling channel. The motion of the filaments through the cooling channel serves to suck-in air through an air inlet arrangement of the cooling channel. The air inlet arrangement includes an upper air inlet which sucks-in air at the underside of the nozzle plate, so that the filaments are contacted by the cooling air immediately upon emerging from the nozzle plate. Contact of the cooling air with the filaments (which are drawn off at a speed of at least 2400 m/min) takes place throughout the length of the cooling channel.

Abstract: A process for producing spin-oriented continuous filaments at a draw-off speed of more than 2400 m/min, whereby the filaments extruded through the spinnerets of the spinning heads are cooled in cooling shafts by the ambient air entrained as a result of the suction action of the filaments and the filaments leaving the cooling shafts enter a chamber that is separate from the intake environment where the air pressure is regulated at a lower pressure in comparison with the air pressure in the intake environment.

Abstract: A process for producing spin-oriented filaments at a draw-off speed of more than 2400 m/min, whereby the filaments extruded from a spinneret are solidified in a cooling shaft solely by the ambient air entrained by the suction effect of the filaments and the cooling shaft having a zone where the walls are air permeable directly beneath the spinneret and has a following zone where the peripheral walls are completely closed.