Abstract: The present invention provides a process for mixing additives into a polymer melt steam, wherein a substream is removed from the polymer melt stream, mixed with additives, and then fed back into the polymer melt stream. In this process, the unmixed substream is sent as a single substream or in a maximum number of n−1 additional substreams directly to one up to a maximum number (n−1) of pump gear wheels of a planet wheel pump with n pump gear wheels. The additives are simultaneously supplied directly without mixing to at least one pump gear wheel of the planet wheel pump, and the substream mixed with the additives is removed from the planet wheel pump centrally at the inlet of the planet wheel pump and fed into the polymer melt stream.

Abstract: The invention provides a reheater door of a spinning device, which door is constructed so as to facilitate relatively easy access to the spinning nozzle plate as well as enable suction removal of vaporizable compounds and prevention of substantial cooling even when the door is open.

Abstract: The present invention comprises a process for the recovery from a reaction mixture of cellulose carbamate produced by conversion of cellulose with excess urea in an inert organic liquid reaction carrier, wherein the reaction mixture is treated with added water under heat, then the liquid phase is separated as much as possible on a filter, the cellulose carbamate remaining on the filter is washed with water, optionally pre-dried and, if desired, dried and recovered, and the organic reaction carrier is recovered by phase separation from the combined liquids.

Abstract: The invention is an apparatus for spinning solutions of cellulose carbamate by extruding the solution through a spinneret into a precipitation bath, coagulating the cellulose carbamate fibers thus formed and drawing off the fibers by mechanical means, where the fibers are enveloped from the outlet of the spinneret to the outlet of the precipitation bath in a stream of precipitating medium flowing in the same direction, where the velocity of flow of the precipitation medium where the fibers exit the spinneret (plane X1) amounts to 0.1 to 0.8 times the draw-off speed of the fibers, and the velocity of flow of the precipitation medium where the fibers exit the precipitation bath (plane X3) amounts to 0.96 to 1.1 times the draw-off speed of the fibers.

Abstract: The invention comprises an injector for feeding additives into a polymer melt stream. The injector comprises a body with a curved surface and a longitudinal axis having an inlet opening for the additives in the upper portion, opening into a channel running along the longitudinal axis and having a 90 degree deflection to a side injector outlet and having two groove-shaped recesses in the outer wall arranged parallel to the channel on both sides at the level of the injector outlet.

Abstract: The present invention comprises a multiway valve for fluids, consisting of an inlet line (1), a connector housing (9), basic valve bodies (2, 3) and additional valve bodies (25, 26, 26') branching off from the connector housing (9), with each of the valve bodies (2, 3, 25, 26, 26') having a valve housing (10) designed as a guide cylinder with a lateral discharge outlet (4) opening into the respective outlet line (5), with a valve spindle (13, 13a) movable in the axial direction within the guide cylinder with a valve head (12, 12a) engaging in a valve seat (6) in the connector housing (9) in the closed position of the respective valve body, as well as the use of this multiway valve.The basic valve bodies (2, 3) have a valve head lantern (17, 18) in the form of a straight cylinder (17) with an attached, straight cylinder (18) cropped at an inclined angle.

Abstract: The invention provides a process and device for the spinning of polyamides including transporting vapor through at least one round spinning nozzle casing (5) using an exhaust device (14, 15) that is positioned under at least one round spinning nozzle plate (10).In this process, the vapor is injected tangentially into the upper portion of the applicable spinning nozzle casing (5) and is conducted downward through at least one helical groove (7), which is arranged along the exterior of the applicable spinning nozzle unit (6). The vapor at the lower end of the spinning nozzle unit (6) is conducted against a circular, horizontally positioned groove (8), where it undergoes a change in the direction of flow toward the spinning nozzle plate (10).

Abstract: The invention comprises a process of producing .epsilon.-caprolactam from extract water of polycaprolactam obtained by hydrolytic polymerization, wherein(i) the extract water is concentrated by distillation of water,(ii) from the concentrated extract water from stage (i) an extract of .epsilon.-caprolactam and oligomers including dimers is obtained by separating an .epsilon.-caprolactam/water vapor mixture,(iii) the extract from stage (ii) is depolymerized in the presence of a catalyst and superheated steam, where a vapor mixture of .epsilon.-caprolactam and water is obtained, and(iv) from the .epsilon.-caprolactam/water vapor mixtures of process stages (ii) and (iii) .epsilon.-caprolactam with a dimer content of .ltoreq.0.2 wt-% is obtained by distillation of water.

Abstract: A process for the improvement of the drawing ability of polyester, pellets of which are thermally post-treated in the solid phase in an inert atmosphere, containing a precise concentration of water vapor. The water vapor concentration is equal to the amount of water, plus 15%/minus 50%, which could theoretically be formed, at the polyester end viscosity, from the --COOH end groups and the excess --OH end groups of the polyester. An equimolar quantity of the vapor of the alkanediol, which serves as the diol reactant for the polyester, may be substituted for all or part of the water vapor.

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: The present invention is a pre-oriented, non-stretched polyester fiber spun with spooling speeds of at least 3,000 m/min., wherein the polyester is a copolymer comprised essentially of ethylene terephthalate units and up to 10 weight % of other dicarboxylic acids or other diols, and carboxy phosphonic acid units of the formula: ##STR1## wherein R is selected from C.sub.1-10 -alkylene, C.sub.1-10 -cycloalkylene or C.sub.6-10 -arylene, in a quantity corresponding to 30 to 500 ppm phosphorus, in relation to polyester. The invention also comprises a process for the production of this fiber.

Abstract: The present invention comprises a process for the production of flame-resistant polyesters with at least 50 mol-% ethylene carboxylate units through esterification or ester interchange and co-polycondensation of at least one diol and a dicarboxylic acid or its dialkyl ester with a carboxyphosphinic acid, whereby the carboxyphosphinic acid, before being added to the co-polycondensation mixture, is dissolved in ethylene glycol of not more than 90.degree. C., and the acid number of this solution is standardized to 50 to 350 mg KOH/g of carboxyphosphinic acid by adding at least one basic alkali metal compound in the absence of oxygen, and said solution is added to the co-polycondensation mixture during the second half of the esterification or ester interchange reaction.