Abstract: A method and apparatus for the steam misting of rectangular nozzles and spinning systems equipped therewith for producing polyamide filaments whereby the steam feed is conducted through a tube loop which is passed through the heating chamber of the spinning beam so that the steam is brought to the spinning temperature. Directly below the spinning beam and thus on the lower edge of the rectangular nozzle stack which is connected thereto, between the spinning beam and the after-heater, steam outlet bars are longitudinally applied. These steam outlet bars are equipped with a simple labyrinth for pressure equalization. The steam inlet is effected initially in each case centrally of the rectangular nozzle stack and transitions into an upwardly open and relatively broad distribution chamber along the rectangular nozzle stack. This vertical distribution chamber transitions into a horizontal and very small gap which is open into the spinning chamber at its mouth.

Abstract: The invention relates to a spinning device in which liquid polymer is guided through a polymer line with a first heating jacket to a spinning pump with a second heating jacket. From said spinning pump, the polymer is transported through several lines to spinning packets and extruded through spinnerts to form filaments. The lines that are connected downstream of the spinning pump, the spinning packets and the spinnerets are located in at least one spinning housing through which heating fluid flows. There is a distance of 5 mm between the spinning housing through which the heating fluid flows and the first and second heating jackets and the spinning pump, to obtain thermal decoupling. According to a method for heating the spinning device, vaporous heating fluid is guided out of a first reservoir into the spinning housing, and heating fluid is guided out of a second reservoir into the first and/or second heating jacket.

Abstract: The invention relates to a spinneret for spinning thermoplastics. Said spinneret comprises a central polymer inlet channel, a filter assembly (2), consisting of one or more filter plates of various filtration grades, a spinneret plate (3) and a housing (1) which receives and tightly surrounds the filter assembly (2) and the spinneret plate (3). The selection of suitable materials and tolerances for the individual parts of the spinneret enables the sealing effect to be achieved at operating temperature by the increased expansion of the internal components, in relation to the external housing.

Abstract: A cooling system for filament bundles, which are spun from polymer melt by at least two spinneret units (1) disposed one beside the other and are drawn off by a draw-off system (17), the filament bundles (3a, 3) being cooled in a three-part shaft (A, B, C) by an equidirectional air stream, and the cross-section of the individual shaft parts (A and B) tapering such that the flow rate of the air increases approximately to the same extent as the draw-off speed of the filament bundles (3a, 3).

Abstract: The invention provides a sealing element for spinning systems used for spinning polymer melts, wherein the sealing element seals the transition between a polymer melt conducting melt channel of a permanently mounted component and a melt channel of a removable, interchangeable component. The sealing element consists of a cylindrical and externally smooth hollow object with an axial bore for passage of the melt, which hollow object is inserted into a fitting socket hole in the interchangeable component and is made of a material with a higher thermal expansion coefficient than that of the surrounding material of the interchangeable component.

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 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 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: A spinning pack with a sand filter for the melt spinning of thermoplastics, whereby at least one perforated plate with evenly distributed D-shaped holes with slanting openings that taper conically in the direction of flow is placed in the direction of flow in front of and/or behind the sand filter. Spinning packs according to the invention surprisingly give highly uniform distribution and flow of thermoplastic melt through the sand filter.