DD244366A1

DD244366A1 - PROCESS FOR TREATMENT OF CONTINUOUSLY PRODUCED VISCOUS EIDE

Info

Publication number: DD244366A1
Application number: DD28456285A
Authority: DD
Inventors: Ulrich Loescher; Gabriele Kuehn; Wilfried Zerndt; Siegfried Penzel
Original assignee: Kunstseidenwerk Clara Zetkin V
Priority date: 1985-12-17
Filing date: 1985-12-17
Publication date: 1987-04-01

Abstract

Das erfindungsgemaesse Verfahren dient zur Erspinnung und kontinuierlichen Nachbehandlung von Viskoseseide. Ziel und Aufgabe bestehen in einer Verbesserung der Produktqualitaet kontinuierlich hergestellter Viskoseseide bezueglich Schrumpf, Restschwefel, Reissfestigkeit, Reissdehnung, Flusigkeit und Anfaerbung bei gleichzeitiger Senkung der Fadenbruchhaeufigkeit und niedrigstem Wasser- und Energieverbrauch. Erfindungsgemaess wird dies erreicht, indem die Nachbehandlung auf verschraenkten Walzen nacheinander die Phasen der Koagulation, Nachzersetzung, Neutralwaesche mit Entschwefelung und Trocknung des endlosen Viskosefadens bzw. -fadenpaares umfasst, wobei die Trocknung am Ende der Nachbehandlungsstrecke auf bikonisch gestalteten Trockenwalzenpaaren erfolgt und das Schrumpfverhalten der Viskoseseide bei der spaeteren textilen Weiterverarbeitung verbessert und der Fadenlauf stabilisiert wird.The inventive method is used for spinning and continuous aftertreatment of viscose. Goal and task consist in an improvement of the product quality of continuously produced viscose with regard to shrinkage, residual sulfur, tear strength, elongation at break, fluidity and Anfaerbung while reducing the yarn breakage frequency and lowest water and energy consumption. According to the invention, this is achieved by the aftertreatment on verschraenkten rolls successively comprises the phases of coagulation, Nachzersetzung, Neutralwaesche with desulfurization and drying of the endless Viskosefadens or -fadenpaares, wherein the drying takes place at the end of the post-treatment on biconical designed dry roller pairs and the shrinkage behavior of the viscose improved in the later textile processing and the threadline is stabilized.

Description

embodiment

Die Erfindung soll nachstehend an einem Ausführungsbeispiel näher erläutert werden.The invention will be explained in more detail below using an exemplary embodiment.

Bei Einsatz einer Viskose-Kontinuespinnmaschine erfolgt nach dem Auflaufen des frisch ersponnenen Fadenpaares mit einem Titer von 17tex und einer Abzugsgeschwindigkeit von 67 m/min auf die Nachbehandlungswalzen die weitere Koagulation durch das anhaftende Spinnbad bei einer Länge der Koagulationszone von 410 mm bis zum Erreichen der Trennstelle zur Nachzersetzungsstrecke.When using a viscose continuous spinning machine after the emergence of freshly spun yarn pair with a titer of 17tex and a take-off speed of 67 m / min on the aftertreatment rollers further coagulation by the adhering spin bath at a length of the coagulation of 410 mm until reaching the separation point to the Nachzersetzungsstrecke.

Nachzersetzt wird das Fadenpaar durch zweifache Aufgabe von Badflüssigkeit auf die Nachzersetzungsstrecke der Unterwalze mit einer Temperatur von 85°C bei einer Schwefelsäurekonzentration von 1,6 Ma.-%, einer Natriumsulfatkonzentration nicht größer als 1,5Ma.-% und einer Länge der Nachzersetzungszone von 305 mm bis zum Erreichen der Trennstelle zur Neutralwaschstrecke. Die Neutralwäsche mit gleichzeitiger Entschwefelung wird durch zweifache Aufgabe von Weichwasser auf die Neutralwaschstrecke der Unterwalze mit einer Temperatur von 80⁰C bei einer Länge der Neutralwaschzone von 405 mm bis zum Erreichen der Trockenstrecke realisiert. Die Trocknung erfolgt am Ende der gesamten Nachbehandlungsstrecke auf bikonisch geformten, 300 mm langen Trockenwalzenpaaren bei einer Oberflächentemperatur von 85⁰C, wodurch das Schrumpfverhalten des Fadenpaares für die spätere textile Weiterverarbeitung verbessert und der Fadenlauf über die Nachbehandlungsstrecke stabilisiert wird.The pair of yarns is subsequently decomposed by adding bath liquid twice to the post-decomposition section of the lower roll at a temperature of 85 ° C. at a sulfuric acid concentration of 1.6% by mass, a sodium sulphate concentration of not more than 1.5% by mass and a length of the post-decomposition zone of 305 mm until it reaches the separation point to the neutral washing line. The neutral wash with simultaneous desulfurization is realized by twofold task of soft water to the neutral washing section of the bottom roller at a temperature of 80 ⁰ C for a length of the neutral washing zone of 405 mm up to reaching the drying section. Drying takes place at the end of the entire post-treatment section on biconical shaped, 300 mm long dry roller pairs at a surface temperature of 85 ⁰ C, whereby the shrinkage behavior of the pair of yarns for subsequent textile processing improved and the yarn path over the aftertreatment section is stabilized.

Der Vorteil des Verfahrens besteht darin, daß auch Viskoseseide, die als endloses Fadenpaar mit sehr kurzen Verweilzeiten über die Nachbehandlungsstrecke läuft, vollständig nachbehandelt wird und nur zwei kritische Badtrennstellen auf der Unterwalze erforderlich sind.The advantage of the method is that even viscose, which runs as an endless pair of yarns with very short residence times on the aftertreatment, is fully cured and only two critical Badtrennstellen on the lower roll are required.

Bei Anwendung des beschriebenen kontinuierlichen Nachbehandlungsverfahrens erhält man Viskoseseide mit folgendenWhen using the described continuous aftertreatment process to obtain viscose with the following

Produkteigenschaften: ' .· '.Product features: '. ·'.

Restxantogenatgehalt(%) < 0,05Residual xanthogen content (%) <0.05

Restschwefelgehalt (%) < 0,04Residual sulfur content (%) <0.04

Restschrumpf (%) < 5 gleichmäßig über GespinstResidual shrinkage (%) <5 evenly over webs

Restfeuchte (%) < 12Residual moisture (%) <12

Reißfestigkeittrocken (mN/tex) >160Tear strength (mN / tex)> 160

Reißdehnung trocken (%) > 18Elongation at break dry (%)> 18

Flusen (Anzahl/100 km) < 2Lint (number / 100 km) <2

Claims

Invention claim:

1. A process for the aftertreatment of continuously produced viscose on continuous spinning machines with entangled pairs of rollers in succession coagulation, post-decomposition, neutral scrubbing with desulfurization and drying of the endless Viskoseseidenfadens or yarn pair, characterized in that the length of the coagulation zone for the yarn path with adhering spin bath 350- 450 mm, preferably 400-420 mm, the post-decomposition at a temperature of 80-90 ° C, preferably 85 ^C C, at a sulfuric acid concentration of 1.0 to 2.5Ma .-%, preferably 1.6Ma .-%, at a sodium sulfate concentration of less than 1.5Ma .-% and a length of Nachzersetzungszone of 250-350 mm, preferably 290-310 mm, the neutral wash with soft water at a temperature of 75-85 ° C, preferably 8O ⁰ C, and a length of Neutral washing zone of 360-440mm, preferably 390-420 mm, and the drying of Viskoseeseidenfadens or -fadenpaares on biconical drying rollers be i a surface temperature of 60-120 ⁰ C, depending on the take-off speed and the yarn titer occurs.

2. The method according to claim 1, characterized in that the Nachzersetzungsbad is operated in the cycle and the task of the wash baths in at least two partial streams over the entire length of the aftertreatment zones takes place with the exclusion of any bath mixing. -

Field of application of the invention

The invention relates to a process for the continuous aftertreatment of freshly spun viscose in the titer range from 6.8 tex to 34 tex, which is then processed mainly in weaving mills for lining materials and in knitwear for sub-tricot.

Characteristic of the known technical solutions

It is generally known that viscose silk is produced in the continuous spinning process with the spinning, aftertreating, drying and twisting process stages, the aftertreatment being carried out on entangled roll pairs. For this purpose, the freshly spun viscose silk thread is conveyed in helical turns over the pair of rollers and washed in the continuous operation by sprinkling the roller surface with special bath liquids and post-treated, then passed through a heated drying roller and finally wound up with twisting. In DE-OS 3100293 a process is described in which the viscose silk thread is regenerated after coagulation and stretching in two stages in an acid aftertreatment bath, wherein the first regeneration stage is carried out at a higher temperature than the second stage. At least one washing stage and the other conventional aftertreatments with the exception of the classic lye desulphurisation are connected to the regeneration. Although the after-treated viscose is completely post-decomposed, but the overall property spectrum of the silk is not satisfactory in textile technology terms.

Furthermore, a two-stage co-coagulation is proposed in DE-OS 3100368, which allows an increased treatment speed, but leads to an impairment of the spinning security and increased linting.

Object of the invention

The aim of the invention is to develop an after-treatment process for continuously spun viscose on continuous spinning machines with entangled pairs of rolls, which ensures a high product quality in terms of shrinkage, residual sulfur, tear strength, elongation at break, liquid and uniformity of staining and full exploitation of the performance by high spin safety and low Frequency of yarn breakage allows economical operation with lowest water and energy consumption.

Explanation of the essence of the invention

The object of the invention is to provide a method in which by a specific order of the individual aftertreatment baths on the freshly spun, not auscoagulated viscose a complete Nachzersetzung, neutralization with desulfurization and drying, so that no impairment of the final product occurs in its quality and at the same time a high degree of spinning safety is achieved by a stable threadline with the lowest water and energy consumption.

According to the invention, this object is achieved in that one carries out the process for the aftertreatment of continuously produced viscose on continuous spinning machines with entangled pairs of rollers in successive coagulation, post-decomposition, neutral scrubbing with desulfurization and drying of the endless Viskoseseidenfadens or -fadenpaares so that the length of the coagulation zone for the yarn path with attached spinning bath 350-450 mm, preferably 400-420 mm, the post-decomposition at a temperature of 80 to 90 ⁰ C, preferably 85 ⁰ C, at a sulfuric acid concentration of 1.0 to 2.5 wt .-%, preferably 1.6 wt .-%, with a sodium sulfate concentration of less than 1.5mA .-% and a length of Nachzersetzungszone of 250-350mm, preferably 290-310mm, the neutral wash with soft water at a temperature of 75-85 ⁰ C, preferably 80 ⁰ C and at a length of the neutral washing zone of 360-440 mm, preferably 390-420 mm, and the drying of the viscose Esbenefadens aufbikonischen drying rollers at a surface temperature of 60-12O ⁰ C, depending on the take-off speed and the yarn titer occurs. It is expedient to operate the Nachzersetzungsbad in circulation and abandon the washing baths in at least two partial streams over the entire length of the aftertreatment zones with the exclusion of any bath mixing.